linux-kernel - [PATCH] x86, msr, remove unused native_read

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Date:	Tue, 22 Mar 2016 19:06:08 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Prarit Bhargava <prarit@...hat.com>, x86@...nel.org,
	Borislav Petkov <bp@...e.de>,
	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH] x86, msr, remove unused native_read_tscp()

After e76b027 ("x86,vdso: Use LSL unconditionally for vgetcpu")
native_read_tscp() is unused in the kernel.  The function can be removed
like native_read_tsc() was.

[prarit@...rit linux]$ git grep native_read_tscp
arch/x86/include/asm/msr.h:45:static inline unsigned long long native_read_tscp(unsigned int *aux)

Cc: x86@...nel.org
Cc: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...capital.net>
Signed-off-by: Prarit Bhargava <prarit@...hat.com>
---
 arch/x86/include/asm/msr.h |    8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 93fb7c1..7a79ee2 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -42,14 +42,6 @@ struct saved_msrs {
 	struct saved_msr *array;
 };
 
-static inline unsigned long long native_read_tscp(unsigned int *aux)
-{
-	unsigned long low, high;
-	asm volatile(".byte 0x0f,0x01,0xf9"
-		     : "=a" (low), "=d" (high), "=c" (*aux));
-	return low | ((u64)high << 32);
-}
-
 /*
  * both i386 and x86_64 returns 64-bit value in edx:eax, but gcc's "A"
  * constraint has different meanings. For i386, "A" means exactly
-- 
1.7.9.3