On Wed, Oct 18, 2023 at 1:01 PM kernel test robot <lkp@xxxxxxxxx> wrote: > > Hi Eric, > > FYI, the error/warning still remains. > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: 2dac75696c6da3c848daa118a729827541c89d33 > commit: fa17a6d8a5bd0cd7565b613cb804242cd0f6b7ab [5136/13299] ipv6: lockless IPV6_ADDR_PREFERENCES implementation > config: alpha-defconfig (https://download.01.org/0day-ci/archive/20231018/202310181854.pKtHd7fD-lkp@xxxxxxxxx/config) > compiler: alpha-linux-gcc (GCC) 13.2.0 > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231018/202310181854.pKtHd7fD-lkp@xxxxxxxxx/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <lkp@xxxxxxxxx> > | Closes: https://lore.kernel.org/oe-kbuild-all/202310181854.pKtHd7fD-lkp@xxxxxxxxx/ > I have no idea why this compiler is not happy. I would probably contact a compiler maintainer perhaps ? > All warnings (new ones prefixed by >>): > > In file included from arch/alpha/include/asm/rwonce.h:33, > from include/linux/compiler.h:246, > from include/linux/string.h:5, > from net/sunrpc/xprtsock.c:23: > In function 'ip6_sock_set_addr_preferences', > inlined from 'xs_tcp_finish_connecting' at net/sunrpc/xprtsock.c:2325:4, > inlined from 'xs_tcp_setup_socket' at net/sunrpc/xprtsock.c:2405:11: > >> include/asm-generic/rwonce.h:44:26: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=] > 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) > | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > include/asm-generic/rwonce.h:55:40: note: in definition of macro '__WRITE_ONCE' > 55 | *(volatile typeof(x) *)&(x) = (val); \ > | ^~~ > include/net/ipv6.h:1365:9: note: in expansion of macro 'WRITE_ONCE' > 1365 | WRITE_ONCE(inet6_sk(sk)->srcprefs, > | ^~~~~~~~~~ > include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE' > 50 | __READ_ONCE(x); \ > | ^~~~~~~~~~~ > include/net/ipv6.h:1366:21: note: in expansion of macro 'READ_ONCE' > 1366 | (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref); > | ^~~~~~~~~ > In function 'xs_tcp_setup_socket': > cc1: note: source object is likely at address zero > In function 'ip6_sock_set_addr_preferences', > inlined from 'xs_tcp_finish_connecting' at net/sunrpc/xprtsock.c:2325:4, > inlined from 'xs_tcp_setup_socket' at net/sunrpc/xprtsock.c:2405:11: > include/asm-generic/rwonce.h:55:37: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=] > 55 | *(volatile typeof(x) *)&(x) = (val); \ > | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~ > include/asm-generic/rwonce.h:61:9: note: in expansion of macro '__WRITE_ONCE' > 61 | __WRITE_ONCE(x, val); \ > | ^~~~~~~~~~~~ > include/net/ipv6.h:1365:9: note: in expansion of macro 'WRITE_ONCE' > 1365 | WRITE_ONCE(inet6_sk(sk)->srcprefs, > | ^~~~~~~~~~ > In function 'xs_tcp_setup_socket': > cc1: note: source object is likely at address zero > In function 'ip6_sock_set_addr_preferences', > inlined from 'xs_tcp_tls_finish_connecting' at net/sunrpc/xprtsock.c:2478:4: > >> include/asm-generic/rwonce.h:44:26: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=] > 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) > | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > include/asm-generic/rwonce.h:55:40: note: in definition of macro '__WRITE_ONCE' > 55 | *(volatile typeof(x) *)&(x) = (val); \ > | ^~~ > include/net/ipv6.h:1365:9: note: in expansion of macro 'WRITE_ONCE' > 1365 | WRITE_ONCE(inet6_sk(sk)->srcprefs, > | ^~~~~~~~~~ > include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE' > 50 | __READ_ONCE(x); \ > | ^~~~~~~~~~~ > include/net/ipv6.h:1366:21: note: in expansion of macro 'READ_ONCE' > 1366 | (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref); > | ^~~~~~~~~ > In function 'xs_tcp_tls_finish_connecting': > cc1: note: source object is likely at address zero > In function 'ip6_sock_set_addr_preferences', > inlined from 'xs_tcp_tls_finish_connecting' at net/sunrpc/xprtsock.c:2478:4: > include/asm-generic/rwonce.h:55:37: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=] > 55 | *(volatile typeof(x) *)&(x) = (val); \ > | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~ > include/asm-generic/rwonce.h:61:9: note: in expansion of macro '__WRITE_ONCE' > 61 | __WRITE_ONCE(x, val); \ > | ^~~~~~~~~~~~ > include/net/ipv6.h:1365:9: note: in expansion of macro 'WRITE_ONCE' > 1365 | WRITE_ONCE(inet6_sk(sk)->srcprefs, > | ^~~~~~~~~~ > In function 'xs_tcp_tls_finish_connecting': > cc1: note: source object is likely at address zero > > > vim +44 include/asm-generic/rwonce.h > > e506ea451254ab Will Deacon 2019-10-15 28 > e506ea451254ab Will Deacon 2019-10-15 29 /* > e506ea451254ab Will Deacon 2019-10-15 30 * Yes, this permits 64-bit accesses on 32-bit architectures. These will > e506ea451254ab Will Deacon 2019-10-15 31 * actually be atomic in some cases (namely Armv7 + LPAE), but for others we > e506ea451254ab Will Deacon 2019-10-15 32 * rely on the access being split into 2x32-bit accesses for a 32-bit quantity > e506ea451254ab Will Deacon 2019-10-15 33 * (e.g. a virtual address) and a strong prevailing wind. > e506ea451254ab Will Deacon 2019-10-15 34 */ > e506ea451254ab Will Deacon 2019-10-15 35 #define compiletime_assert_rwonce_type(t) \ > e506ea451254ab Will Deacon 2019-10-15 36 compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ > e506ea451254ab Will Deacon 2019-10-15 37 "Unsupported access size for {READ,WRITE}_ONCE().") > e506ea451254ab Will Deacon 2019-10-15 38 > e506ea451254ab Will Deacon 2019-10-15 39 /* > e506ea451254ab Will Deacon 2019-10-15 40 * Use __READ_ONCE() instead of READ_ONCE() if you do not require any > 3c9184109e78ea Will Deacon 2019-10-30 41 * atomicity. Note that this may result in tears! > e506ea451254ab Will Deacon 2019-10-15 42 */ > b78b331a3f5c07 Will Deacon 2019-10-15 43 #ifndef __READ_ONCE > e506ea451254ab Will Deacon 2019-10-15 @44 #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) > b78b331a3f5c07 Will Deacon 2019-10-15 45 #endif > e506ea451254ab Will Deacon 2019-10-15 46 > > :::::: The code at line 44 was first introduced by commit > :::::: e506ea451254ab17e0bf918ca36232fec2a9b10c compiler.h: Split {READ,WRITE}_ONCE definitions out into rwonce.h > > :::::: TO: Will Deacon <will@xxxxxxxxxx> > :::::: CC: Will Deacon <will@xxxxxxxxxx> > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki
