Re: [PATCH V3 2/5] mm: mlock: Add new mlock, munlock, and munlockall system calls
From: Heiko Carstens <hidden>
Date: 2015-07-08 06:46:27
Also in:
linux-alpha, linux-arch, linux-arm-kernel, linux-m68k, linux-mips, linux-mm, linux-s390, linux-sh, linuxppc-dev, lkml, sparclinux
On Tue, Jul 07, 2015 at 01:03:40PM -0400, Eric B Munson wrote:
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 <redacted>
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quoted hunk ↗ jump to hunk
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S index 1acad02..f6d81d6 100644 --- a/arch/s390/kernel/syscalls.S +++ b/arch/s390/kernel/syscalls.S@@ -363,3 +363,6 @@ SYSCALL(sys_bpf,compat_sys_bpf) SYSCALL(sys_s390_pci_mmio_write,compat_sys_s390_pci_mmio_write) SYSCALL(sys_s390_pci_mmio_read,compat_sys_s390_pci_mmio_read) SYSCALL(sys_execveat,compat_sys_execveat) +SYSCALL(sys_mlock2,compat_sys_mlock2) /* 355 */ +SYSCALL(sys_munlock2,compat_sys_munlock2) +SYSCALL(sys_munlockall2,compat_sys_munlockall2)
FWIW, you would also need to add matching lines to the two files arch/s390/include/uapi/asm/unistd.h arch/s390/kernel/compat_wrapper.c so that the system call would be wired up on s390.