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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-18 19:00:34 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-27 13:12:51 +1000
commitea3cc330ac0cd521ff07c7cd432a1848c19a7e92 (patch)
tree82f3e84e28ebf5ae33d05ec0142c22b30a21c60a /arch/powerpc/include/asm/pgtable-ppc64.h
parentf480fe3916de2e2cbb6e384cb685f0f1d8272188 (diff)
downloadblackbird-op-linux-ea3cc330ac0cd521ff07c7cd432a1848c19a7e92.tar.gz
blackbird-op-linux-ea3cc330ac0cd521ff07c7cd432a1848c19a7e92.zip
powerpc/mm: Cleanup handling of execute permission
This is an attempt at cleaning up a bit the way we handle execute permission on powerpc. _PAGE_HWEXEC is gone, _PAGE_EXEC is now only defined by CPUs that can do something with it, and the myriad of #ifdef's in the I$/D$ coherency code is reduced to 2 cases that hopefully should cover everything. The logic on BookE is a little bit different than what it was though not by much. Since now, _PAGE_EXEC will be set by the generic code for executable pages, we need to filter out if they are unclean and recover it. However, I don't expect the code to be more bloated than it already was in that area due to that change. I could boast that this brings proper enforcing of per-page execute permissions to all BookE and 40x but in fact, we've had that now for some time as a side effect of my previous rework in that area (and I didn't even know it :-) We would only enable execute permission if the page was cache clean and we would only cache clean it if we took and exec fault. Since we now enforce that the later only work if VM_EXEC is part of the VMA flags, we de-fact already enforce per-page execute permissions... Unless I missed something Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/pgtable-ppc64.h')
-rw-r--r--arch/powerpc/include/asm/pgtable-ppc64.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/pgtable-ppc64.h b/arch/powerpc/include/asm/pgtable-ppc64.h
index 200ec2dfa034..806abe7a3fa5 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64.h
@@ -313,8 +313,7 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
{
unsigned long bits = pte_val(entry) &
- (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW |
- _PAGE_EXEC | _PAGE_HWEXEC);
+ (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
#ifdef PTE_ATOMIC_UPDATES
unsigned long old, tmp;
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