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powerpc: Add a local_flush_tlb_page to handle kmap_atomic invalidates

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The tlb invalidates in kmap_atomic/kunmap_atomic can be called from
IRQ context, however they are only local invalidates (on the processor
that the kmap was called on).  In the future we want to use IPIs to
do tlb invalidates this causes issue since flush_tlb_page() is considered
a broadcast invalidate.

Add local_flush_tlb_page() as a non-broadcast invalidate and use it in
kmap_atomic() since we don't have enough information in the
flush_tlb_page() call to determine its local.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Kumar Gala
2008-11-19 05:53:24 +00:00
committed by Paul Mackerras
parent f4f3a1261a
commit df3b861155
2 changed files with 16 additions and 2 deletions
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4
arch/powerpc/include/asm/highmem.h
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@ -85,7 +85,7 @@ static inline void *kmap_atomic_prot(struct page *page, enum km_type type, pgpro
BUG_ON(!pte_none(*(kmap_pte-idx)));
#endif
__set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot));
flush_tlb_page(NULL, vaddr);
local_flush_tlb_page(vaddr);
return (void*) vaddr;
}
@ -113,7 +113,7 @@ static inline void kunmap_atomic(void *kvaddr, enum km_type type)
* this pte without first remap it
*/
pte_clear(&init_mm, vaddr, kmap_pte-idx);
flush_tlb_page(NULL, vaddr);
local_flush_tlb_page(vaddr);
#endif
pagefault_enable();
}