From: tip-bot for Dan Williams <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: tglx@linutronix.de, hpa@zytor.com, mingo@kernel.org,
torvalds@linux-foundation.org, luto@kernel.org,
dan.j.williams@intel.com, linux-kernel@vger.kernel.org,
peterz@infradead.org
Subject: [tip:x86/pti] x86/speculation: Fix up array_index_nospec_mask() asm constraint
Date: Tue, 13 Feb 2018 05:06:49 -0800 [thread overview]
Message-ID: <tip-87360f969eb214fb22b7e03acb2475a809e040c5@git.kernel.org> (raw)
In-Reply-To: <151797010204.1289.1510000292250184993.stgit@dwillia2-desk3.amr.corp.intel.com>
Commit-ID: 87360f969eb214fb22b7e03acb2475a809e040c5
Gitweb: https://git.kernel.org/tip/87360f969eb214fb22b7e03acb2475a809e040c5
Author: Dan Williams <dan.j.williams@intel.com>
AuthorDate: Tue, 6 Feb 2018 18:22:40 -0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 13 Feb 2018 14:01:25 +0100
x86/speculation: Fix up array_index_nospec_mask() asm constraint
Allow the compiler to handle @size as an immediate value or memory
directly rather than allocating a register.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/151797010204.1289.1510000292250184993.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/barrier.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
index 30d4061..e1259f0 100644
--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h
@@ -40,7 +40,7 @@ static inline unsigned long array_index_mask_nospec(unsigned long index,
asm ("cmp %1,%2; sbb %0,%0;"
:"=r" (mask)
- :"r"(size),"r" (index)
+ :"g"(size),"r" (index)
:"cc");
return mask;
}
next prev parent reply other threads:[~2018-02-13 13:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-07 2:22 [PATCH v2] x86/nospec: Fixup array_index_nospec_mask() asm constraint Dan Williams
2018-02-13 13:06 ` tip-bot for Dan Williams [this message]
2018-02-15 0:27 ` [tip:x86/pti] x86/speculation: Fix up " tip-bot for Dan Williams
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