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Message-Id: <1441720742-7803-3-git-send-email-emunson@akamai.com>
Date: Tue, 8 Sep 2015 09:58:58 -0400
From: Eric B Munson <emunson@...mai.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Eric B Munson <emunson@...mai.com>, Michal Hocko <mhocko@...e.cz>,
Vlastimil Babka <vbabka@...e.cz>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Catalin Marinas <catalin.marinas@....com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Guenter Roeck <linux@...ck-us.net>,
linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
adi-buildroot-devel@...ts.sourceforge.net,
linux-cris-kernel@...s.com, linux-ia64@...r.kernel.org,
linux-m68k@...ts.linux-m68k.org, linux-am33-list@...hat.com,
linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
linux-mm@...ck.org
Subject: [PATCH v9 2/6] 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@...mai.com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Acked-by: Michal Hocko <mhocko@...e.com>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: linux-alpha@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: adi-buildroot-devel@...ts.sourceforge.net
Cc: linux-cris-kernel@...s.com
Cc: linux-ia64@...r.kernel.org
Cc: linux-m68k@...ts.linux-m68k.org
Cc: linux-am33-list@...hat.com
Cc: linux-parisc@...r.kernel.org
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-s390@...r.kernel.org
Cc: linux-sh@...r.kernel.org
Cc: sparclinux@...r.kernel.org
Cc: linux-xtensa@...ux-xtensa.org
Cc: linux-api@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Cc: linux-mm@...ck.org
---
Changes from V8:
* Update x86[_64] syscall numbers to follow the new userfaultfd syscalls
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 | 8 ++++++++
6 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 477bfa6..41e72a5 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -381,3 +381,4 @@
372 i386 recvmsg sys_recvmsg compat_sys_recvmsg
373 i386 shutdown sys_shutdown
374 i386 userfaultfd sys_userfaultfd
+375 i386 mlock2 sys_mlock2
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index 81c4906..2366900 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/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 --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 0800131..890632c 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -885,4 +885,6 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename,
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 --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index e016bd9..14a6013 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -709,9 +709,11 @@ __SYSCALL(__NR_memfd_create, sys_memfd_create)
__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 --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 03c3875..8de5b26 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -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);
diff --git a/mm/mlock.c b/mm/mlock.c
index c32ad8f..a23a533 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -644,6 +644,14 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
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)
{
int ret;
--
1.9.1
--
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