diff options
Diffstat (limited to 'arch/x86/include/asm/vgtod.h')
| -rw-r--r-- | arch/x86/include/asm/vgtod.h | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h index e728699db774..022e59714562 100644 --- a/arch/x86/include/asm/vgtod.h +++ b/arch/x86/include/asm/vgtod.h @@ -17,8 +17,8 @@ struct vsyscall_gtod_data { unsigned seq; int vclock_mode; - cycle_t cycle_last; - cycle_t mask; + u64 cycle_last; + u64 mask; u32 mult; u32 shift; @@ -89,8 +89,13 @@ static inline unsigned int __getcpu(void) * works on all CPUs. This is volatile so that it orders * correctly wrt barrier() and to keep gcc from cleverly * hoisting it out of the calling function. + * + * If RDPID is available, use it. */ - asm volatile ("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG)); + alternative_io ("lsl %[p],%[seg]", + ".byte 0xf3,0x0f,0xc7,0xf8", /* RDPID %eax/rax */ + X86_FEATURE_RDPID, + [p] "=a" (p), [seg] "r" (__PER_CPU_SEG)); return p; } |