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x86-64: Wire up getcpu syscall

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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>
This commit is contained in:
Andy Lutomirski 2011-08-10 11:15:31 -04:00 committed by H. Peter Anvin
parent f3fb5b7bb7
commit fce8dc0642
1 changed files with 2 additions and 0 deletions
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arch/x86/include/asm/unistd_64.h
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@ -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