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Re: [git pull] x86 fixes
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From: H. Peter Anvin
Subject:
Re: [git pull] x86 fixes
Date: Thursday, July 24, 2008 - 1:38 pm
Linus Torvalds wrote:
quoted text
> > On Thu, 24 Jul 2008, Ingo Molnar wrote: >> Hugh Dickins (1): >> x86: BUILD_IRQ say .text to avoid .data.percpu >> >> diff --git a/arch/x86/kernel/irqinit_64.c b/arch/x86/kernel/irqinit_64.c >> index 0373e88..9414125 100644 >> --- a/arch/x86/kernel/irqinit_64.c >> +++ b/arch/x86/kernel/irqinit_64.c >> @@ -43,7 +43,7 @@ >> >> #define BUILD_IRQ(nr) \ >> asmlinkage void IRQ_NAME(nr); \ >> - asm("\n.p2align\n" \ >> + asm("\n.text\n.p2align\n" \ >> "IRQ" #nr "_interrupt:\n\t" \ >> "push $~(" #nr ") ; " \ >> "jmp common_interrupt"); > > I do not think this is a good idea AT ALL. > > You need a ".previous" there too, otherwise any random C code that doesn't > _happen_ to change segments will now possibly put some random variable in > the .text segment. > > And yes, dependign on just where the BUILD_IRQ() is, and what is around > it, and what compiler version we have, this bug may or may not show. But > it's still _wrong_. > > I pulled it, will fix up by hand.
You're obviously right here; thanks for taking care of it. -hpa --
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Messages in current thread:
[git pull] x86 fixes
, Ingo Molnar
, (Thu Jul 24, 8:12 am)
Re: [git pull] x86 fixes
, Linus Torvalds
, (Thu Jul 24, 12:36 pm)
Re: [git pull] x86 fixes
, H. Peter Anvin
, (Thu Jul 24, 1:38 pm)
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