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powerpc: Fixes for CONFIG_PTE_64BIT for SMP support

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There are some minor issues with support 64-bit PTEs on a 32-bit processor
when dealing with SMP.

* We need to order the stores in set_pte_at to make sure the flag word
  is set second.
* Change pte_clear to use pte_update so only the flag word is cleared
* Added a WARN_ON to set_pte_at to ensure the pte isn't present for
  the 64-bit pte/SMP case (to ensure our assumption of this fact).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Becky Bruce <becky.bruce@freescale.com>
This commit is contained in:
Kumar Gala
2008-07-16 15:54:21 -05:00
parent 0ba3418b8b
commit 9bf2b5cdc5
2 changed files with 21 additions and 6 deletions
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2
arch/powerpc/include/asm/highmem.h
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@ -84,7 +84,7 @@ static inline void *kmap_atomic_prot(struct page *page, enum km_type type, pgpro
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(*(kmap_pte-idx)));
#endif
set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot));
__set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot));
flush_tlb_page(NULL, vaddr);
return (void*) vaddr;