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authorSamuel Neves <sneves@dei.uc.pt>2018-09-01 21:14:52 +0100
committerThomas Gleixner <tglx@linutronix.de>2018-09-01 23:01:56 +0200
commite78e5a91456fcecaa2efbb3706572fe043766f4d (patch)
tree99f38fa6807bb35d9db236dd0a2311c1feffdb4f
parentc7486104a5ce7e8763e3cb5157bba8d0f1468d87 (diff)
downloadlinux-stericsson-e78e5a91456fcecaa2efbb3706572fe043766f4d.tar.gz
x86/vdso: Fix lsl operand order
In the __getcpu function, lsl is using the wrong target and destination registers. Luckily, the compiler tends to choose %eax for both variables, so it has been working so far. Fixes: a582c540ac1b ("x86/vdso: Use RDPID in preference to LSL when available") Signed-off-by: Samuel Neves <sneves@dei.uc.pt> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20180901201452.27828-1-sneves@dei.uc.pt
-rw-r--r--arch/x86/include/asm/vgtod.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
index fb856c9f0449..53748541c487 100644
--- a/arch/x86/include/asm/vgtod.h
+++ b/arch/x86/include/asm/vgtod.h
@@ -93,7 +93,7 @@ static inline unsigned int __getcpu(void)
*
* If RDPID is available, use it.
*/
- alternative_io ("lsl %[p],%[seg]",
+ alternative_io ("lsl %[seg],%[p]",
".byte 0xf3,0x0f,0xc7,0xf8", /* RDPID %eax/rax */
X86_FEATURE_RDPID,
[p] "=a" (p), [seg] "r" (__PER_CPU_SEG));