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Message-Id: <1345345030-22211-31-git-send-email-andi@firstfloor.org>
Date: Sat, 18 Aug 2012 19:56:26 -0700
From: Andi Kleen <andi@...stfloor.org>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org, mmarek@...e.cz, linux-kbuild@...r.kernel.org,
JBeulich@...e.com, akpm@...ux-foundation.org,
Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 30/74] x86, lto: Fix AMD K6 indirect call check
From: Andi Kleen <ak@...ux.intel.com>
The AMD K6 errata check relies on timing a indirect call.
But the way it was written it could be optimized to a direct call.
Force gcc to actually do a indirect call and not just
constant resolve the target address.
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
arch/x86/kernel/cpu/amd.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 2c02d92..cb72014 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -116,7 +116,7 @@ static void __cpuinit init_amd_k6(struct cpuinfo_x86 *c)
*/
n = K6_BUG_LOOP;
- f_vide = vide;
+ asm("" : "=r" (f_vide) : "0" (vide));
rdtscl(d);
while (n--)
f_vide();
--
1.7.7.6
--
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