On Tue, 21 Jul 2015 15:59:37 -0400 Eric B Munson <emunson@xxxxxxxxxx> 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.
This is hard. Maybe we shouldn't have wired up anything other than x86. That's what we usually do with new syscalls. You appear to have missed mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-fix.patch: --- a/arch/arm64/include/asm/unistd.h~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-fix +++ a/arch/arm64/include/asm/unistd.h @@ -44,7 +44,7 @@ #define __ARM_NR_compat_cacheflush (__ARM_NR_COMPAT_BASE+2) #define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE+5) -#define __NR_compat_syscalls 388 +#define __NR_compat_syscalls 391 #endif #define __ARCH_WANT_SYS_CLONE And mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-fix-2.patch: From: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Subject: mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-fix-2 can we just remove the s390 bits which cause the breakage? I will wire up the syscalls as soon as the patch set gets merged. Heiko Carstens <heiko.carstens@xxxxxxxxxx> Cc: Eric B Munson <emunson@xxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/s390/kernel/syscalls.S | 3 --- 1 file changed, 3 deletions(-) diff -puN arch/s390/kernel/syscalls.S~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-fix-2 arch/s390/kernel/syscalls.S --- a/arch/s390/kernel/syscalls.S~mm-mlock-add-new-mlock-munlock-and-munlockall-system-calls-fix-2 +++ a/arch/s390/kernel/syscalls.S @@ -363,6 +363,3 @@ 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) -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
