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authorChang S. Bae <chang.seok.bae@intel.com>2018-09-18 16:08:58 -0700
committerIngo Molnar <mingo@kernel.org>2018-10-08 10:41:10 +0200
commitffebbaedc8616cffe648202e364dce6a045d65a2 (patch)
treedb77803dfcd20c32ec9703f8d382943479941559 /arch/x86/include/asm/vgtod.h
parentc4755613a1339ea77dbb15de75c9f74217209265 (diff)
x86/vdso: Introduce helper functions for CPU and node number
Clean up the CPU/node number related code a bit, to make it more apparent how we are encoding/extracting the CPU and node fields from the segment limit. No change in functionality intended. [ mingo: Wrote new changelog. ] Suggested-by: Andy Lutomirski <luto@kernel.org> Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Link: http://lkml.kernel.org/r/1537312139-5580-8-git-send-email-chang.seok.bae@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/vgtod.h')
-rw-r--r--arch/x86/include/asm/vgtod.h26
1 files changed, 0 insertions, 26 deletions
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
index 4e81ea920722..056a61c8c5c7 100644
--- a/arch/x86/include/asm/vgtod.h
+++ b/arch/x86/include/asm/vgtod.h
@@ -77,30 +77,4 @@ static inline void gtod_write_end(struct vsyscall_gtod_data *s)
++s->seq;
}
-#ifdef CONFIG_X86_64
-
-#define VGETCPU_CPU_MASK 0xfff
-
-static inline unsigned int __getcpu(void)
-{
- unsigned int p;
-
- /*
- * Load CPU (and node) number from GDT. LSL is faster than RDTSCP
- * and works on all CPUs. This is volatile so that it orders
- * correctly with respect to barrier() and to keep GCC from cleverly
- * hoisting it out of the calling function.
- *
- * If RDPID is available, use it.
- */
- alternative_io ("lsl %[seg],%[p]",
- ".byte 0xf3,0x0f,0xc7,0xf8", /* RDPID %eax/rax */
- X86_FEATURE_RDPID,
- [p] "=a" (p), [seg] "r" (__CPU_NUMBER_SEG));
-
- return p;
-}
-
-#endif /* CONFIG_X86_64 */
-
#endif /* _ASM_X86_VGTOD_H */