diff options
| author |   Andy Lutomirski <luto@mit.edu> | 2011-08-10 11:15:31 -0400 |
|---|---|---|
| committer |   H. Peter Anvin <hpa@linux.intel.com> | 2011-08-10 19:26:46 -0500 |
| commit | fce8dc06423d6fb2709469dc5c55b04e09c1d126 (patch) | |
| tree | b6a901db2c89a140adfbe09cc0547fb232f9b270 /arch | |
| parent | x86: Remove unnecessary compile flag tweaks for vsyscall code (diff) | |
| download | linux-dev-fce8dc06423d6fb2709469dc5c55b04e09c1d126.tar.xz linux-dev-fce8dc06423d6fb2709469dc5c55b04e09c1d126.zip | |
x86-64: Wire up getcpu syscall
getcpu is available as a vdso entry and an emulated vsyscall.
Programs that for some reason don't want to use the vdso should
still be able to call getcpu without relying on the slow emulated
vsyscall. It costs almost nothing to expose it as a real syscall.
We also need this for the following patch in vsyscall=native mode.
Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/6b19f55bdb06a0c32c2fa6dba9b6f222e1fde999.1312988155.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/unistd_64.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm/unistd_64.h index 705bf139288c..d92641cc7acc 100644 --- a/arch/x86/include/asm/unistd_64.h +++ b/arch/x86/include/asm/unistd_64.h @@ -681,6 +681,8 @@ __SYSCALL(__NR_syncfs, sys_syncfs) __SYSCALL(__NR_sendmmsg, sys_sendmmsg) #define __NR_setns 308 __SYSCALL(__NR_setns, sys_setns) +#define __NR_getcpu 309 +__SYSCALL(__NR_getcpu, sys_getcpu) #ifndef __NO_STUBS #define __ARCH_WANT_OLD_READDIR |