Hi all, After merging the kspp tree, today's linux-next build (arm multi_v7_defconfig) produced these warnings: In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'of_css': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_file_write': kernel/cgroup/cgroup.c:476:44: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 476 | return rcu_dereference_check(cgrp->subsys[ss->id], include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:389:48: note: in expansion of macro 'READ_ONCE' 389 | typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \ | ^~~~~~~~~ include/linux/rcupdate.h:528:2: note: in expansion of macro '__rcu_dereference_check' 528 | __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c:476:10: note: in expansion of macro 'rcu_dereference_check' 476 | return rcu_dereference_check(cgrp->subsys[ss->id], | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_get_e_css': kernel/cgroup/cgroup.c:476:44: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 476 | return rcu_dereference_check(cgrp->subsys[ss->id], include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:389:48: note: in expansion of macro 'READ_ONCE' 389 | typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \ | ^~~~~~~~~ include/linux/rcupdate.h:528:2: note: in expansion of macro '__rcu_dereference_check' 528 | __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c:476:10: note: in expansion of macro 'rcu_dereference_check' 476 | return rcu_dereference_check(cgrp->subsys[ss->id], | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ kernel/cgroup/cgroup.c:590:27: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 590 | css = init_css_set.subsys[ss->id]; | ~~~~~~~~~~~~~~~~~~~^~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:205:30: note: while referencing 'subsys' 205 | struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ kernel/cgroup/cgroup.c:744:16: note: defined here 'init_css_set' 744 | struct css_set init_css_set = { | ^~~~~~~~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_subtree_control_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_controllers_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cpu_stat_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_freeze_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_max_depth_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_max_descendants_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_stat_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_events_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_type_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_seqfile_show': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_addrm_files': kernel/cgroup/cgroup.c:476:44: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 476 | return rcu_dereference_check(cgrp->subsys[ss->id], include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:389:48: note: in expansion of macro 'READ_ONCE' 389 | typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \ | ^~~~~~~~~ include/linux/rcupdate.h:528:2: note: in expansion of macro '__rcu_dereference_check' 528 | __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c:476:10: note: in expansion of macro 'rcu_dereference_check' 476 | return rcu_dereference_check(cgrp->subsys[ss->id], | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_e_css': kernel/cgroup/cgroup.c:476:44: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 476 | return rcu_dereference_check(cgrp->subsys[ss->id], include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:389:48: note: in expansion of macro 'READ_ONCE' 389 | typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \ | ^~~~~~~~~ include/linux/rcupdate.h:528:2: note: in expansion of macro '__rcu_dereference_check' 528 | __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c:476:10: note: in expansion of macro 'rcu_dereference_check' 476 | return rcu_dereference_check(cgrp->subsys[ss->id], | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ kernel/cgroup/cgroup.c:561:28: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 561 | return init_css_set.subsys[ss->id]; | ~~~~~~~~~~~~~~~~~~~^~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:205:30: note: while referencing 'subsys' 205 | struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ kernel/cgroup/cgroup.c:744:16: note: defined here 'init_css_set' 744 | struct css_set init_css_set = { | ^~~~~~~~~~~~ kernel/cgroup/cgroup.c: In function 'cgroup_taskset_next': kernel/cgroup/cgroup.c:2395:29: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 2395 | *dst_cssp = cset->subsys[tset->ssid]; | ~~~~~~~~~~~~^~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:205:30: note: while referencing 'subsys' 205 | struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ kernel/cgroup/cgroup.c:2393:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 2393 | *dst_cssp = cset->mg_dst_cset->subsys[tset->ssid]; | ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:205:30: note: while referencing 'subsys' 205 | struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_rm_cftypes': kernel/cgroup/cgroup.c:476:44: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 476 | return rcu_dereference_check(cgrp->subsys[ss->id], include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:389:48: note: in expansion of macro 'READ_ONCE' 389 | typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \ | ^~~~~~~~~ include/linux/rcupdate.h:528:2: note: in expansion of macro '__rcu_dereference_check' 528 | __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c:476:10: note: in expansion of macro 'rcu_dereference_check' 476 | return rcu_dereference_check(cgrp->subsys[ss->id], | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c:476:44: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 476 | return rcu_dereference_check(cgrp->subsys[ss->id], include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:389:48: note: in expansion of macro 'READ_ONCE' 389 | typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \ | ^~~~~~~~~ include/linux/rcupdate.h:528:2: note: in expansion of macro '__rcu_dereference_check' 528 | __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c:476:10: note: in expansion of macro 'rcu_dereference_check' 476 | return rcu_dereference_check(cgrp->subsys[ss->id], | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ kernel/cgroup/cgroup.c: In function 'css_task_iter_start': kernel/cgroup/cgroup.c:4647:18: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct list_head[0]' [-Wzero-length-bounds] 4647 | it->cset_pos = &css->cgroup->e_csets[css->ss->id]; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:443:19: note: while referencing 'e_csets' 443 | struct list_head e_csets[CGROUP_SUBSYS_COUNT]; | ^~~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function '__cgroup_procs_start': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'cgroup_procs_start': kernel/cgroup/cgroup.c:651:42: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:403:25: note: in expansion of macro 'READ_ONCE' 403 | typeof(p) ________p1 = READ_ONCE(p); \ | ^~~~~~~~~ kernel/cgroup/cgroup.c:651:10: note: in expansion of macro 'rcu_dereference_raw' 651 | return rcu_dereference_raw(cgrp->subsys[cft->ss->id]); | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ In file included from ./arch/arm/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/uapi/linux/swab.h:6, from include/linux/swab.h:5, from arch/arm/include/asm/opcodes.h:86, from arch/arm/include/asm/bug.h:7, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/arm/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/cgroup.h:12, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: kernel/cgroup/cgroup.c: In function 'css_tryget_online_from_dir': kernel/cgroup/cgroup.c:476:44: warning: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'struct cgroup_subsys_state *[0]' [-Wzero-length-bounds] 476 | return rcu_dereference_check(cgrp->subsys[ss->id], include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ include/linux/rcupdate.h:389:48: note: in expansion of macro 'READ_ONCE' 389 | typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \ | ^~~~~~~~~ include/linux/rcupdate.h:528:2: note: in expansion of macro '__rcu_dereference_check' 528 | __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c:476:10: note: in expansion of macro 'rcu_dereference_check' 476 | return rcu_dereference_check(cgrp->subsys[ss->id], | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/cgroup.h:28, from kernel/cgroup/cgroup-internal.h:5, from kernel/cgroup/cgroup.c:31: include/linux/cgroup-defs.h:426:36: note: while referencing 'subsys' 426 | struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT]; | ^~~~~~ Introduced by commit 7d8aac16a0a8 ("Makefile: Enable -Wzero-length-bounds") -- Cheers, Stephen Rothwell
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