Messages in this thread Patch in this message | | | Date | Fri, 25 Apr 2008 18:22:15 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 1/1] x86: fix text_poke |
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* Linus Torvalds <torvalds@linux-foundation.org> wrote:
> + spin_lock_irqsave(&poke_lock, flags); > + set_fixmap(FIX_POKE, phys); > + memcpy((void *)(virt + offset), opcode, len); > + spin_unlock_irqrestore(&poke_lock, flags);
hm, right now we've got a debug protection in set_fixmap() to make sure it's only ever called once. So it's going to be a noisy bootup. (but it's a warning only) The patch below removes that.
Ingo
-------------> Subject: x86: remove set_fixmap() warning From: Ingo Molnar <mingo@elte.hu> Date: Fri Apr 25 18:05:57 CEST 2008
set_fixmap() is safe as long as it's explicitly serialized between all users.
Signed-off-by: Ingo Molnar <mingo@elte.hu> --- arch/x86/mm/init_64.c | 3 --- 1 file changed, 3 deletions(-)
Index: linux/arch/x86/mm/init_64.c =================================================================== --- linux.orig/arch/x86/mm/init_64.c +++ linux/arch/x86/mm/init_64.c @@ -173,9 +173,6 @@ set_pte_phys(unsigned long vaddr, unsign new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); pte = pte_offset_kernel(pmd, vaddr); - if (!pte_none(*pte) && - pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) - pte_ERROR(*pte); set_pte(pte, new_pte); /*
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