From: Dan Williams <dan.j.williams@intel.com>
To: mingo@kernel.org
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH] x86/nospec: Fixup array_index_nospec_mask() asm constraint
Date: Tue, 06 Feb 2018 17:33:15 -0800 [thread overview]
Message-ID: <151796719550.10756.8688156573547110419.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
Allow the compiler to handle @size as an immediate value rather than
allocating a register.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
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 30d406146016..9e9d6f27825a 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)
+ :"ir"(size),"r" (index)
:"cc");
return mask;
}
next reply other threads:[~2018-02-07 1:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-07 1:33 Dan Williams [this message]
2018-02-07 1:50 ` [PATCH] x86/nospec: Fixup array_index_nospec_mask() asm constraint Linus Torvalds
2018-02-07 1:55 ` Dan Williams
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