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powerpc: hugetlb: fix huge_ptep_set_access_flags return value 

There was an unconditional return of "1" in the original code
from David Gibson, and I dropped it because it wasn't needed
for FSL BOOKE 32-bit.  However, not all systems (including 64-bit
FSL BOOKE) do loading of the hpte from the fault handler asm
and depend on this function returning 1, which causes a call
to update_mmu_cache() that writes an entry into the tlb.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Becky Bruce 2011-10-10 10:50:37 +00:00 committed by Benjamin Herrenschmidt
parent 7651295944
commit 97632e6fbe
1 changed files with 11 additions and 0 deletions
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11
arch/powerpc/include/asm/hugetlb.h
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@ -124,7 +124,18 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t pte, int dirty)
{
#if defined(CONFIG_PPC_MMU_NOHASH) && \
!(defined(CONFIG_PPC_FSL_BOOK3E) && defined(CONFIG_PPC32))
/*
* The "return 1" forces a call of update_mmu_cache, which will write a
* TLB entry. Without this, platforms that don't do a write of the TLB
* entry in the TLB miss handler asm will fault ad infinitum.
*/
ptep_set_access_flags(vma, addr, ptep, pte, dirty);
return 1;
#else
return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
#endif
}
static inline pte_t huge_ptep_get(pte_t *ptep)