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Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
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From: Ingo Molnar
Subject:
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
Date: Wednesday, March 5, 2008 - 8:35 am
* Stephan Diestelhorst <langer_mann@web.de> wrote:
quoted text
> @@ -184,7 +184,7 @@ static void speedstep_set_state (unsigne > __asm__ __volatile__( > "movl __PLACEHOLDER__0_, %%edi\n" > "out %%al, (%%dx)\n" > - : "=b" (new_state), "=D" (result) > + : "=b" (new_state), "=D" (result), "=c" (ecx_clobber) > : "a" (command), "b" (function), "c" (state), "d" (smi_port), "S" (0) > );
stupid suggestion: why not do a pusha/popa around those instructions, to make sure everything is restored? This isnt a fastpath and being conservative about SMI side-effects cannot hurt ... Ingo --
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Messages in current thread:
[PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Stephan Diestelhorst
, (Wed Mar 5, 7:59 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Ingo Molnar
, (Wed Mar 5, 8:35 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, H. Peter Anvin
, (Wed Mar 5, 9:02 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Stephan Diestelhorst
, (Thu Mar 6, 1:38 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Stephan Diestelhorst
, (Thu Mar 6, 1:51 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Ingo Molnar
, (Thu Mar 6, 3:56 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Stephan Diestelhorst
, (Mon Mar 10, 8:05 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Andi Kleen
, (Mon Mar 10, 9:46 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Stephan Diestelhorst
, (Mon Mar 10, 2:26 pm)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Andi Kleen
, (Mon Mar 10, 2:51 pm)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Stephan Diestelhorst
, (Mon Mar 10, 4:14 pm)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Ingo Molnar
, (Tue Mar 11, 2:39 am)
Re: [PATCH 1/1] Speedfreq-SMI call clobbers ECX
, Stephan Diestelhorst
, (Wed Mar 12, 8:04 am)
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