diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-03-24 19:40:37 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-03-27 22:47:31 -0800 |
| commit | 5e48e1d6331d9a5f8ca50998c4c229b297215948 (patch) | |
| tree | 838a2c7463b8c6e67355c70f792986e2699b2154 /arch | |
| parent | 74c34e68ec7ac4383ee49b2e8b8a7a2efa8e1012 (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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/cpu/cpufreq/speedstep-smi.c | 4 |
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 28cc5d524af..cfc4276e670 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); |