Commit a8ca5d0e authored by Eric B Munson's avatar Eric B Munson Committed by Linus Torvalds
Browse files

mm: mlock: add new mlock system call 



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: default avatarEric B Munson <emunson@akamai.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarVlastimil 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1aab92ec

arch/x86/entry/syscalls/syscall_32.tbl

+1 −0
Original line number Diff line number Diff line
@@ -382,3 +382,4 @@ 
373	i386	shutdown		sys_shutdown

374	i386	userfaultfd		sys_userfaultfd

375	i386	membarrier		sys_membarrier

376	i386	mlock2			sys_mlock2

arch/x86/entry/syscalls/syscall_64.tbl

+1 −0
Original line number Diff line number Diff line
@@ -331,6 +331,7 @@ 
322	64	execveat		stub_execveat

323	common	userfaultfd		sys_userfaultfd

324	common	membarrier		sys_membarrier

325	common	mlock2			sys_mlock2



#

# x32-specific system call numbers start at 512 to avoid cache impact

include/linux/syscalls.h

+2 −0
Original line number Diff line number Diff line
@@ -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_mlock2(unsigned long start, size_t len, int flags);



#endif

include/uapi/asm-generic/unistd.h

+3 −1
Original line number Diff line number Diff line
@@ -713,9 +713,11 @@ __SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat) 
__SYSCALL(__NR_userfaultfd, sys_userfaultfd)

#define __NR_membarrier 283

__SYSCALL(__NR_membarrier, sys_membarrier)

#define __NR_mlock2 284

__SYSCALL(__NR_mlock2, sys_mlock2)



#undef __NR_syscalls

#define __NR_syscalls 284

#define __NR_syscalls 285



/*

 * All syscalls below here should go away really,

kernel/sys_ni.c

+1 −0
Original line number Diff line number Diff line
@@ -194,6 +194,7 @@ cond_syscall(sys_mlock); 
cond_syscall(sys_munlock);

cond_syscall(sys_mlockall);

cond_syscall(sys_munlockall);

cond_syscall(sys_mlock2);

cond_syscall(sys_mincore);

cond_syscall(sys_madvise);

cond_syscall(sys_mremap);

CRA Git | Maintained and supported by SUSTech CRA and CCSE