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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-04-29 15:25:30 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2016-05-01 10:32:21 +0200
commitc7d54842deb1fa357cff75b988275a1c9f259140 (patch)
treecab739cf4650a0397c0057a2878b386d613370a0 /arch/powerpc/mm/hash64_4k.c
parentpowerpc/mm: Use pte_raw() in pte_same()/pmd_same() (diff)
downloadlinux-c7d54842deb1fa357cff75b988275a1c9f259140.tar.xz
linux-c7d54842deb1fa357cff75b988275a1c9f259140.zip
powerpc/mm: Use _PAGE_READ to indicate Read access
This splits the _PAGE_RW bit into _PAGE_READ and _PAGE_WRITE. It also removes the dependency on _PAGE_USER for implying read only. Few things to note here is that, we have read implied with write and execute permission. Hence we should always find _PAGE_READ set on hash pte fault. We still can't switch PROT_NONE to !(_PAGE_RWX). Auto numa depends on marking a prot none pte _PAGE_WRITE. (For more details look at b191f9b106ea "mm: numa: preserve PTE write permissions across a NUMA hinting fault") Cc: Arnd Bergmann <arnd@arndb.de> Cc: Jeremy Kerr <jk@ozlabs.org> Cc: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hash64_4k.c')
-rw-r--r--arch/powerpc/mm/hash64_4k.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/mm/hash64_4k.c b/arch/powerpc/mm/hash64_4k.c
index dbd3133a8562..491b7d137cd8 100644
--- a/arch/powerpc/mm/hash64_4k.c
+++ b/arch/powerpc/mm/hash64_4k.c
@@ -45,7 +45,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
* also add _PAGE_COMBO
*/
new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED;
- if (access & _PAGE_RW)
+ if (access & _PAGE_WRITE)
new_pte |= _PAGE_DIRTY;
} while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));