The patch titled
Andi, you broke my laptop :-)
has been added to the -mm tree. Its filename is
andi-you-broke-my-laptop.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
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------------------------------------------------------
Subject: Andi, you broke my laptop :-)
From: Pete Zaitcev <zaitcev@xxxxxxxxxx>
The attached patch (actually, git show output) makes my Dell 1501 to hang
on boot. Sorry, I have no clue why... The culprit is found with git bisect.
But yes, it's an AMD MK-36. I use an x86_64 kernel. It is 100% reproducible.
Cheers,
-- Pete
commit c5bcb5635a03da3158f121ae20ccbbf72b4fc62a
Author: Andi Kleen <ak@xxxxxxx>
Date: Wed May 2 19:27:21 2007 +0200
[PATCH] x86: Use RDTSCP for synchronous get_cycles if possible
RDTSCP is already synchronous and doesn't need an explicit CPUID.
This is a little faster and more importantly avoids VMEXITs on Hypervisors.
Original patch from Joerg Roedel, but reworked by AK
Also includes miscompilation fix by Eric Biederman
Cc: "Joerg Roedel" <joerg.roedel@xxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-i386/tsc.h | 9 ---------
1 file changed, 9 deletions(-)
diff -puN include/asm-i386/tsc.h~andi-you-broke-my-laptop include/asm-i386/tsc.h
--- a/include/asm-i386/tsc.h~andi-you-broke-my-laptop
+++ a/include/asm-i386/tsc.h
@@ -38,15 +38,6 @@ static __always_inline cycles_t get_cycl
unsigned eax;
/*
- * Use RDTSCP if possible; it is guaranteed to be synchronous
- * and doesn't cause a VMEXIT on Hypervisors
- */
- alternative_io(ASM_NOP3, ".byte 0x0f,0x01,0xf9", X86_FEATURE_RDTSCP,
- "=A" (ret), "0" (0ULL) : "ecx", "memory");
- if (ret)
- return ret;
-
- /*
* Don't do an additional sync on CPUs where we know
* RDTSC is already synchronous:
*/
_
Patches currently in -mm which might be from zaitcev@xxxxxxxxxx are
origin.patch
andi-you-broke-my-laptop.patch
-
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