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mm: mlock: add new mlock system call

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With the refactored mlock code, introduce a new system call for mlock.
The new call will allow the user to specify what lock states are being
added.  mlock2 is trivial at the moment, but a follow on patch will add a
new mlock state making it useful.

Signed-off-by: Eric B Munson <emunson@akamai.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric B Munson 2015-11-05 18:51:33 -08:00 committed by Linus Torvalds
parent 1aab92ec3d
commit a8ca5d0ecb
6 changed files with 16 additions and 1 deletions
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1
arch/x86/entry/syscalls/syscall_32.tbl
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@ -382,3 +382,4 @@
373 i386 shutdown sys_shutdown 373 i386 shutdown sys_shutdown
374 i386 userfaultfd sys_userfaultfd 374 i386 userfaultfd sys_userfaultfd
375 i386 membarrier sys_membarrier 375 i386 membarrier sys_membarrier
376 i386 mlock2 sys_mlock2

1
arch/x86/entry/syscalls/syscall_64.tbl
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@ -331,6 +331,7 @@
322 64 execveat stub_execveat 322 64 execveat stub_execveat
323 common userfaultfd sys_userfaultfd 323 common userfaultfd sys_userfaultfd
324 common membarrier sys_membarrier 324 common membarrier sys_membarrier
325 common mlock2 sys_mlock2
# #
# x32-specific system call numbers start at 512 to avoid cache impact # x32-specific system call numbers start at 512 to avoid cache impact

2
include/linux/syscalls.h
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@ -887,4 +887,6 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename,
asmlinkage long sys_membarrier(int cmd, int flags); asmlinkage long sys_membarrier(int cmd, int flags);
asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
#endif #endif

4
include/uapi/asm-generic/unistd.h
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@ -713,9 +713,11 @@ __SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat)
__SYSCALL(__NR_userfaultfd, sys_userfaultfd) __SYSCALL(__NR_userfaultfd, sys_userfaultfd)
#define __NR_membarrier 283 #define __NR_membarrier 283
__SYSCALL(__NR_membarrier, sys_membarrier) __SYSCALL(__NR_membarrier, sys_membarrier)
#define __NR_mlock2 284
__SYSCALL(__NR_mlock2, sys_mlock2)
#undef __NR_syscalls #undef __NR_syscalls
#define __NR_syscalls 284 #define __NR_syscalls 285
/* /*
* All syscalls below here should go away really, * All syscalls below here should go away really,

1
kernel/sys_ni.c
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@ -194,6 +194,7 @@ cond_syscall(sys_mlock);
cond_syscall(sys_munlock); cond_syscall(sys_munlock);
cond_syscall(sys_mlockall); cond_syscall(sys_mlockall);
cond_syscall(sys_munlockall); cond_syscall(sys_munlockall);
cond_syscall(sys_mlock2);
cond_syscall(sys_mincore); cond_syscall(sys_mincore);
cond_syscall(sys_madvise); cond_syscall(sys_madvise);
cond_syscall(sys_mremap); cond_syscall(sys_mremap);

8
mm/mlock.c
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@ -644,6 +644,14 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
return do_mlock(start, len, VM_LOCKED); return do_mlock(start, len, VM_LOCKED);
} }
SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags)
{
if (flags)
return -EINVAL;
return do_mlock(start, len, VM_LOCKED);
}
SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
{ {
int ret; int ret;