The patch titled
Subject: mm: mlock: add new mlock system call
has been added to the -mm tree. Its filename is
mm-mlock-add-new-mlock-system-call.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mlock-add-new-mlock-system-call.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mlock-add-new-mlock-system-call.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
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------------------------------------------------------
From: Eric B Munson <emunson@xxxxxxxxxx>
Subject: 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: 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: Jonathan Corbet <corbet@xxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/entry/syscalls/syscall_64.tbl | 1 +
include/linux/syscalls.h | 2 ++
include/uapi/asm-generic/unistd.h | 4 +++-
kernel/sys_ni.c | 1 +
mm/mlock.c | 9 +++++++++
6 files changed, 17 insertions(+), 1 deletion(-)
diff -puN arch/x86/entry/syscalls/syscall_32.tbl~mm-mlock-add-new-mlock-system-call arch/x86/entry/syscalls/syscall_32.tbl
--- a/arch/x86/entry/syscalls/syscall_32.tbl~mm-mlock-add-new-mlock-system-call
+++ a/arch/x86/entry/syscalls/syscall_32.tbl
@@ -366,3 +366,4 @@
357 i386 bpf sys_bpf
358 i386 execveat sys_execveat stub32_execveat
359 i386 userfaultfd sys_userfaultfd
+360 i386 mlock2 sys_mlock2
diff -puN arch/x86/entry/syscalls/syscall_64.tbl~mm-mlock-add-new-mlock-system-call arch/x86/entry/syscalls/syscall_64.tbl
--- a/arch/x86/entry/syscalls/syscall_64.tbl~mm-mlock-add-new-mlock-system-call
+++ a/arch/x86/entry/syscalls/syscall_64.tbl
@@ -330,6 +330,7 @@
321 common bpf sys_bpf
322 64 execveat stub_execveat
323 common userfaultfd sys_userfaultfd
+324 common mlock2 sys_mlock2
#
# x32-specific system call numbers start at 512 to avoid cache impact
diff -puN include/linux/syscalls.h~mm-mlock-add-new-mlock-system-call include/linux/syscalls.h
--- a/include/linux/syscalls.h~mm-mlock-add-new-mlock-system-call
+++ a/include/linux/syscalls.h
@@ -885,4 +885,6 @@ asmlinkage long sys_execveat(int dfd, co
const char __user *const __user *argv,
const char __user *const __user *envp, int flags);
+asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
+
#endif
diff -puN include/uapi/asm-generic/unistd.h~mm-mlock-add-new-mlock-system-call include/uapi/asm-generic/unistd.h
--- a/include/uapi/asm-generic/unistd.h~mm-mlock-add-new-mlock-system-call
+++ a/include/uapi/asm-generic/unistd.h
@@ -709,9 +709,11 @@ __SYSCALL(__NR_memfd_create, sys_memfd_c
__SYSCALL(__NR_bpf, sys_bpf)
#define __NR_execveat 281
__SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat)
+#define __NR_mlock2 282
+__SYSCALL(__NR_mlock2, sys_mlock2)
#undef __NR_syscalls
-#define __NR_syscalls 282
+#define __NR_syscalls 283
/*
* All syscalls below here should go away really,
diff -puN kernel/sys_ni.c~mm-mlock-add-new-mlock-system-call kernel/sys_ni.c
--- a/kernel/sys_ni.c~mm-mlock-add-new-mlock-system-call
+++ a/kernel/sys_ni.c
@@ -193,6 +193,7 @@ 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);
diff -puN mm/mlock.c~mm-mlock-add-new-mlock-system-call mm/mlock.c
--- a/mm/mlock.c~mm-mlock-add-new-mlock-system-call
+++ a/mm/mlock.c
@@ -643,6 +643,15 @@ SYSCALL_DEFINE2(mlock, unsigned long, st
return do_mlock(start, len, VM_LOCKED);
}
+SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags)
+{
+ vm_flags_t vm_flags = VM_LOCKED;
+ if (flags)
+ return -EINVAL;
+
+ return do_mlock(start, len, vm_flags);
+}
+
SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
{
int ret;
_
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-system-call.patch
mm-introduce-vm_lockonfault.patch
mm-mlock-add-mlock-flags-to-enable-vm_lockonfault-usage.patch
selftests-vm-add-tests-for-lock-on-fault.patch
mips-add-entry-for-new-mlock2-syscall.patch
--
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