This is a note to let you know that I've just added the patch titled
i8k: Avoid lahf in 64-bit code
to the 2.6.33-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.33.git;a=summary
The filename of the patch is:
i8k-avoid-lahf-in-64-bit-code.patch
and it can be found in the queue-2.6.33 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.33 longterm
tree,
please let <[email protected]> know about it.
>From bc1f419c76a2d6450413ce4349f4e4a07be011d5 Mon Sep 17 00:00:00 2001
From: Luca Tettamanti <[email protected]>
Date: Wed, 25 May 2011 20:43:31 +0200
Subject: i8k: Avoid lahf in 64-bit code
From: Luca Tettamanti <[email protected]>
commit bc1f419c76a2d6450413ce4349f4e4a07be011d5 upstream.
i8k uses lahf to read the flag register in 64-bit code; early x86-64
CPUs, however, lack this instruction and we get an invalid opcode
exception at runtime.
Use pushf to load the flag register into the stack instead.
Signed-off-by: Luca Tettamanti <[email protected]>
Reported-by: Jeff Rickman <[email protected]>
Tested-by: Jeff Rickman <[email protected]>
Tested-by: Harry G McGavran Jr <[email protected]>
Cc: Massimo Dal Zotto <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/char/i8k.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -138,8 +138,8 @@ static int i8k_smm(struct smm_regs *regs
"movl %%edi,20(%%rax)\n\t"
"popq %%rdx\n\t"
"movl %%edx,0(%%rax)\n\t"
- "lahf\n\t"
- "shrl $8,%%eax\n\t"
+ "pushfq\n\t"
+ "popq %%rax\n\t"
"andl $1,%%eax\n"
:"=a"(rc)
: "a"(regs)
Patches currently in longterm-queue-2.6.33 which might be from
[email protected] are
_______________________________________________
stable mailing list
[email protected]
http://linux.kernel.org/mailman/listinfo/stable
