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authorAndrew Morton <akpm@osdl.org>2006-03-24 19:40:37 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-03-27 22:47:31 -0800
commit5e48e1d6331d9a5f8ca50998c4c229b297215948 (patch)
tree838a2c7463b8c6e67355c70f792986e2699b2154
parent74c34e68ec7ac4383ee49b2e8b8a7a2efa8e1012 (diff)
[PATCH] Fix speedstep-smi assembly bug in speedstep_smi_ownership
Fix bug identified by Linus Torvalds <torvalds@osdl.org>: the `out' instruction depends upon the state of memory_data[], so we need to tell gcc that before executing it. (The opcode, not gcc). Fixes http://bugzilla.kernel.org/show_bug.cgi?id=5553 Thanks to Antonio Ospite <ospite@studenti.unina.it> for testing. Cc: Dave Jones <davej@codemonkey.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--arch/i386/kernel/cpu/cpufreq/speedstep-smi.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-smi.c b/arch/i386/kernel/cpu/cpufreq/speedstep-smi.c
index 28cc5d524afc..cfc4276e670e 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-smi.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-smi.c
@@ -75,7 +75,9 @@ static int speedstep_smi_ownership (void)
__asm__ __volatile__(
"out %%al, (%%dx)\n"
: "=D" (result)
- : "a" (command), "b" (function), "c" (0), "d" (smi_port), "D" (0), "S" (magic)
+ : "a" (command), "b" (function), "c" (0), "d" (smi_port),
+ "D" (0), "S" (magic)
+ : "memory"
);
dprintk("result is %x\n", result);