The patch titled
Subject: mm: mlock: Add new mlock, munlock, and munlockall system calls
has been added to the -mm tree. Its filename is
mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Eric B Munson <emunson@xxxxxxxxxx>
Subject: mm: mlock: Add new mlock, munlock, and munlockall system calls
With the refactored mlock code, introduce new system calls for mlock,
munlock, and munlockall. The new calls will allow the user to specify
what lock states are being added or cleared. mlock2 and munlock2 are
trivial at the moment, but a follow on patch will add a new mlock state
making them useful.
munlock2 addresses a limitation of the current implementation. If a
user calls mlockall(MCL_CURRENT | MCL_FUTURE) and then later decides
that MCL_FUTURE should be removed, they would have to call munlockall()
followed by mlockall(MCL_CURRENT) which could potentially be very
expensive. The new munlockall2 system call allows a user to simply
clear the MCL_FUTURE flag.
Signed-off-by: Eric B Munson <emunson@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: linux-alpha@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: adi-buildroot-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-cris-kernel@xxxxxxxx
Cc: linux-ia64@xxxxxxxxxxxxxxx
Cc: linux-m68k@xxxxxxxxxxxxxxxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-am33-list@xxxxxxxxxx
Cc: linux-parisc@xxxxxxxxxxxxxxx
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: linux-s390@xxxxxxxxxxxxxxx
Cc: linux-sh@xxxxxxxxxxxxxxx
Cc: sparclinux@xxxxxxxxxxxxxxx
Cc: linux-xtensa@xxxxxxxxxxxxxxxx
Cc: linux-api@xxxxxxxxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
---
Changes from V3:
* Do a (hopefully) complete job of adding the new system calls
index a56e608..1d09392 100644
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/alpha/include/uapi/asm/unistd.h | 3 ++
arch/arm/include/asm/unistd.h | 2 -
arch/arm/include/uapi/asm/unistd.h | 3 ++
arch/arm/kernel/calls.S | 2 -
arch/avr32/include/uapi/asm/unistd.h | 3 ++
arch/blackfin/include/uapi/asm/unistd.h | 3 ++
arch/ia64/include/asm/unistd.h | 2 -
arch/ia64/include/uapi/asm/unistd.h | 3 ++
arch/m68k/include/asm/unistd.h | 2 -
arch/m68k/include/uapi/asm/unistd.h | 3 ++
arch/microblaze/include/uapi/asm/unistd.h | 3 ++
arch/mips/include/uapi/asm/unistd.h | 21 ++++++++++++++------
arch/parisc/include/uapi/asm/unistd.h | 5 +++-
arch/powerpc/include/uapi/asm/unistd.h | 3 ++
arch/s390/include/uapi/asm/unistd.h | 5 +++-
arch/s390/kernel/compat_wrapper.c | 3 ++
arch/sparc/include/uapi/asm/unistd.h | 5 +++-
arch/x86/entry/syscalls/syscall_64.tbl | 1
arch/xtensa/include/uapi/asm/unistd.h | 4 +--
19 files changed, 61 insertions(+), 15 deletions(-)
diff -puN arch/alpha/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/alpha/include/uapi/asm/unistd.h
--- a/arch/alpha/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/alpha/include/uapi/asm/unistd.h
@@ -475,5 +475,8 @@
#define __NR_getrandom 511
#define __NR_memfd_create 512
#define __NR_execveat 513
+#define __NR_mlock2 514
+#define __NR_munlock2 515
+#define __NR_munlockall2 516
#endif /* _UAPI_ALPHA_UNISTD_H */
diff -puN arch/arm/include/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/arm/include/asm/unistd.h
--- a/arch/arm/include/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/arm/include/asm/unistd.h
@@ -19,7 +19,7 @@
* This may need to be greater than __NR_last_syscall+1 in order to
* account for the padding in the syscall table
*/
-#define __NR_syscalls (388)
+#define __NR_syscalls (392)
/*
* *NOTE*: This is a ghost syscall private to the kernel. Only the
diff -puN arch/arm/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/arm/include/uapi/asm/unistd.h
--- a/arch/arm/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/arm/include/uapi/asm/unistd.h
@@ -414,6 +414,9 @@
#define __NR_memfd_create (__NR_SYSCALL_BASE+385)
#define __NR_bpf (__NR_SYSCALL_BASE+386)
#define __NR_execveat (__NR_SYSCALL_BASE+387)
+#define __NR_mlock2 (__NR_SYSCALL_BASE+388)
+#define __NR_munlock2 (__NR_SYSCALL_BASE+389)
+#define __NR_munlockall2 (__NR_SYSCALL_BASE+390)
/*
* The following SWIs are ARM private.
diff -puN arch/arm/kernel/calls.S~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/arm/kernel/calls.S
--- a/arch/arm/kernel/calls.S~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/arm/kernel/calls.S
@@ -399,7 +399,7 @@
CALL(sys_execveat)
CALL(sys_mlock2)
CALL(sys_munlock2)
-/* 400 */ CALL(sys_munlockall2)
+/* 390 */ CALL(sys_munlockall2)
#ifndef syscalls_counted
.equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
#define syscalls_counted
diff -puN arch/avr32/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/avr32/include/uapi/asm/unistd.h
--- a/arch/avr32/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/avr32/include/uapi/asm/unistd.h
@@ -333,5 +333,8 @@
#define __NR_memfd_create 318
#define __NR_bpf 319
#define __NR_execveat 320
+#define __NR_mlock2 321
+#define __NR_munlock2 322
+#define __NR_munlockall2 323
#endif /* _UAPI__ASM_AVR32_UNISTD_H */
diff -puN arch/blackfin/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/blackfin/include/uapi/asm/unistd.h
--- a/arch/blackfin/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/blackfin/include/uapi/asm/unistd.h
@@ -433,6 +433,9 @@
#define __IGNORE_munlock
#define __IGNORE_mlockall
#define __IGNORE_munlockall
+#define __IGNORE_mlock2
+#define __IGNORE_munlock2
+#define __IGNORE_munlockall2
#define __IGNORE_mincore
#define __IGNORE_madvise
#define __IGNORE_remap_file_pages
diff -puN arch/ia64/include/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/ia64/include/asm/unistd.h
--- a/arch/ia64/include/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/ia64/include/asm/unistd.h
@@ -11,7 +11,7 @@
-#define NR_syscalls 319 /* length of syscall table */
+#define NR_syscalls 322 /* length of syscall table */
/*
* The following defines stop scripts/checksyscalls.sh from complaining about
diff -puN arch/ia64/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/ia64/include/uapi/asm/unistd.h
--- a/arch/ia64/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/ia64/include/uapi/asm/unistd.h
@@ -332,5 +332,8 @@
#define __NR_memfd_create 1340
#define __NR_bpf 1341
#define __NR_execveat 1342
+#define __NR_mlock2 1343
+#define __NR_munlock2 1344
+#define __NR_munlockall2 1345
#endif /* _UAPI_ASM_IA64_UNISTD_H */
diff -puN arch/m68k/include/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/m68k/include/asm/unistd.h
--- a/arch/m68k/include/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/m68k/include/asm/unistd.h
@@ -4,7 +4,7 @@
#include <uapi/asm/unistd.h>
-#define NR_syscalls 356
+#define NR_syscalls 359
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_OLD_STAT
diff -puN arch/m68k/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/m68k/include/uapi/asm/unistd.h
--- a/arch/m68k/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/m68k/include/uapi/asm/unistd.h
@@ -361,5 +361,8 @@
#define __NR_memfd_create 353
#define __NR_bpf 354
#define __NR_execveat 355
+#define __NR_mlock2 356
+#define __NR_munlock2 357
+#define __NR_munlockall2 358
#endif /* _UAPI_ASM_M68K_UNISTD_H_ */
diff -puN arch/microblaze/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/microblaze/include/uapi/asm/unistd.h
--- a/arch/microblaze/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/microblaze/include/uapi/asm/unistd.h
@@ -404,5 +404,8 @@
#define __NR_memfd_create 386
#define __NR_bpf 387
#define __NR_execveat 388
+#define __NR_mlock2 389 /* ok - nommu or mmu */
+#define __NR_munlock2 390 /* ok - nommu or mmu */
+#define __NR_munlockall2 391 /* ok - nommu or mmu */
#endif /* _UAPI_ASM_MICROBLAZE_UNISTD_H */
diff -puN arch/mips/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/mips/include/uapi/asm/unistd.h
--- a/arch/mips/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/mips/include/uapi/asm/unistd.h
@@ -377,16 +377,19 @@
#define __NR_memfd_create (__NR_Linux + 354)
#define __NR_bpf (__NR_Linux + 355)
#define __NR_execveat (__NR_Linux + 356)
+#define __NR_mlock2 (__NR_Linux + 357)
+#define __NR_munlock2 (__NR_Linux + 358)
+#define __NR_munlockall2 (__NR_Linux + 359)
/*
* Offset of the last Linux o32 flavoured syscall
*/
-#define __NR_Linux_syscalls 356
+#define __NR_Linux_syscalls 359
#endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
#define __NR_O32_Linux 4000
-#define __NR_O32_Linux_syscalls 356
+#define __NR_O32_Linux_syscalls 359
#if _MIPS_SIM == _MIPS_SIM_ABI64
@@ -711,16 +714,19 @@
#define __NR_memfd_create (__NR_Linux + 314)
#define __NR_bpf (__NR_Linux + 315)
#define __NR_execveat (__NR_Linux + 316)
+#define __NR_mlock2 (__NR_Linux + 317)
+#define __NR_munlock2 (__NR_Linux + 318)
+#define __NR_munlockall2 (__NR_Linux + 319)
/*
* Offset of the last Linux 64-bit flavoured syscall
*/
-#define __NR_Linux_syscalls 316
+#define __NR_Linux_syscalls 319
#endif /* _MIPS_SIM == _MIPS_SIM_ABI64 */
#define __NR_64_Linux 5000
-#define __NR_64_Linux_syscalls 316
+#define __NR_64_Linux_syscalls 319
#if _MIPS_SIM == _MIPS_SIM_NABI32
@@ -1049,15 +1055,18 @@
#define __NR_memfd_create (__NR_Linux + 318)
#define __NR_bpf (__NR_Linux + 319)
#define __NR_execveat (__NR_Linux + 320)
+#define __NR_mlock2 (__NR_Linux + 321)
+#define __NR_munlock2 (__NR_Linux + 322)
+#define __NR_munlockall2 (__NR_Linux + 323)
/*
* Offset of the last N32 flavoured syscall
*/
-#define __NR_Linux_syscalls 320
+#define __NR_Linux_syscalls 323
#endif /* _MIPS_SIM == _MIPS_SIM_NABI32 */
#define __NR_N32_Linux 6000
-#define __NR_N32_Linux_syscalls 320
+#define __NR_N32_Linux_syscalls 323
#endif /* _UAPI_ASM_UNISTD_H */
diff -puN arch/parisc/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/parisc/include/uapi/asm/unistd.h
--- a/arch/parisc/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/parisc/include/uapi/asm/unistd.h
@@ -358,8 +358,11 @@
#define __NR_memfd_create (__NR_Linux + 340)
#define __NR_bpf (__NR_Linux + 341)
#define __NR_execveat (__NR_Linux + 342)
+#define __NR_mlock2 (__NR_Linux + 343)
+#define __NR_munlock2 (__NR_Linux + 344)
+#define __NR_munlockall2 (__NR_Linux + 345)
-#define __NR_Linux_syscalls (__NR_execveat + 1)
+#define __NR_Linux_syscalls (__NR_munlockall2 + 1)
#define __IGNORE_select /* newselect */
diff -puN arch/powerpc/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/powerpc/include/uapi/asm/unistd.h
--- a/arch/powerpc/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/powerpc/include/uapi/asm/unistd.h
@@ -387,5 +387,8 @@
#define __NR_execveat 362
#define __NR_switch_endian 363
#define __NR_userfaultfd 364
+#define __NR_mlock2 365
+#define __NR_munlock2 366
+#define __NR_munlockall2 367
#endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */
diff -puN arch/s390/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/s390/include/uapi/asm/unistd.h
--- a/arch/s390/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/s390/include/uapi/asm/unistd.h
@@ -290,7 +290,10 @@
#define __NR_s390_pci_mmio_write 352
#define __NR_s390_pci_mmio_read 353
#define __NR_execveat 354
-#define NR_syscalls 355
+#define __NR_mlock2 355
+#define __NR_munlock2 356
+#define __NR_munlockall2 357
+#define NR_syscalls 358
/*
* There are some system calls that are not present on 64 bit, some
diff -puN arch/s390/kernel/compat_wrapper.c~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/s390/kernel/compat_wrapper.c
--- a/arch/s390/kernel/compat_wrapper.c~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/s390/kernel/compat_wrapper.c
@@ -220,3 +220,6 @@ COMPAT_SYSCALL_WRAP2(memfd_create, const
COMPAT_SYSCALL_WRAP3(bpf, int, cmd, union bpf_attr *, attr, unsigned int, size);
COMPAT_SYSCALL_WRAP3(s390_pci_mmio_write, const unsigned long, mmio_addr, const void __user *, user_buffer, const size_t, length);
COMPAT_SYSCALL_WRAP3(s390_pci_mmio_read, const unsigned long, mmio_addr, void __user *, user_buffer, const size_t, length);
+COMPAT_SYSCALL_WRAP3(mlock2, unsigned long, start, size_t, len, int, flags);
+COMPAT_SYSCALL_WRAP3(munlock2, unsigned long, start, size_t, len, int, flags);
+COMPAT_SYSCALL_WRAP1(munlockall2, int, flags);
diff -puN arch/sparc/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/sparc/include/uapi/asm/unistd.h
--- a/arch/sparc/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/sparc/include/uapi/asm/unistd.h
@@ -416,8 +416,11 @@
#define __NR_memfd_create 348
#define __NR_bpf 349
#define __NR_execveat 350
+#define __NR_mlock2 351
+#define __NR_munlock2 352
+#define __NR_munlockall2 353
-#define NR_syscalls 351
+#define NR_syscalls 354
/* Bitmask values returned from kern_features system call. */
#define KERN_FEATURE_MIXED_MODE_STACK 0x00000001
diff -puN arch/x86/entry/syscalls/syscall_64.tbl~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/x86/entry/syscalls/syscall_64.tbl
--- a/arch/x86/entry/syscalls/syscall_64.tbl~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/x86/entry/syscalls/syscall_64.tbl
@@ -334,6 +334,7 @@
325 common munlock2 sys_munlock2
326 common munlockall2 sys_munlockall2
+
#
# x32-specific system call numbers start at 512 to avoid cache impact
# for native 64-bit operation.
diff -puN arch/xtensa/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4 arch/xtensa/include/uapi/asm/unistd.h
--- a/arch/xtensa/include/uapi/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4
+++ a/arch/xtensa/include/uapi/asm/unistd.h
@@ -756,9 +756,9 @@ __SYSCALL(341, sys_execveat, 5)
#define __NR_mlock2 342
__SYSCALL(342, sys_mlock2, 3)
#define __NR_munlock2 343
-__SYSCALL(342, sys_munlock2, 3)
+__SYSCALL(343, sys_munlock2, 3)
#define __NR_munlockall2 344
-__SYSCALL(342, sys_munlock2, 1)
+__SYSCALL(344, sys_munlock2, 1)
#define __NR_syscall_count 345
_
Patches currently in -mm which might be from emunson@xxxxxxxxxx are
mm-mlock-refactor-mlock-munlock-and-munlockall-code.patch
mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls.patch
mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-v4.patch
mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-fix.patch
mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-fix-2.patch
mm-gup-add-mm_lock_present.patch
mm-mlock-introduce-vm_lockonfault-and-add-mlock-flags-to-enable-it.patch
mm-mlock-introduce-vm_lockonfault-and-add-mlock-flags-to-enable-it-v4.patch
mm-mmap-add-mmap-flag-to-request-vm_lockonfault.patch
mm-mmap-add-mmap-flag-to-request-vm_lockonfault-v4.patch
selftests-vm-add-tests-for-lock-on-fault.patch
selftests-vm-add-tests-for-lock-on-fault-v4.patch
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