ppc32 has it already, add it to ppc64 as a preliminary for adding
support for Book3E 64-bit support
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
arch/powerpc/include/asm/pgtable-ppc64.h | 12 +++++++++++-
arch/powerpc/include/asm/pte-hash64.h | 2 ++
2 files changed, 13 insertions(+), 1 deletion(-)
--- linux-work.orig/arch/powerpc/include/asm/pgtable-ppc64.h 2009-03-10
15:43:26.000000000 +1100
+++ linux-work/arch/powerpc/include/asm/pgtable-ppc64.h 2009-03-10
16:08:30.000000000 +1100
@@ -178,6 +178,7 @@ static inline unsigned long pte_update(s
pte_t *ptep, unsigned long clr,
int huge)
{
+#ifdef PTE_ATOMIC_UPDATES
unsigned long old, tmp;
__asm__ __volatile__(
@@ -190,7 +191,10 @@ static inline unsigned long pte_update(s
: "=&r" (old), "=&r" (tmp), "=m" (*ptep)
: "r" (ptep), "r" (clr), "m" (*ptep), "i" (_PAGE_BUSY)
: "cc" );
-
+#else
+ unsigned long old = pte_val(*ptep);
+ *ptep = __pte(old & ~clr);
+#endif
/* huge pages use the old page table lock */
if (!huge)
assert_pte_locked(mm, addr);
@@ -278,6 +282,8 @@ static inline void __ptep_set_access_fla
unsigned long bits = pte_val(entry) &
(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW |
_PAGE_EXEC | _PAGE_HWEXEC);
+
+#ifdef PTE_ATOMIC_UPDATES
unsigned long old, tmp;
__asm__ __volatile__(
@@ -290,6 +296,10 @@ static inline void __ptep_set_access_fla
:"=&r" (old), "=&r" (tmp), "=m" (*ptep)
:"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
:"cc");
+#else
+ unsigned long old = pte_val(*ptep);
+ *ptep = __pte(old | bits);
+#endif
}
#define __HAVE_ARCH_PTE_SAME
Index: linux-work/arch/powerpc/include/asm/pte-hash64.h
===================================================================
--- linux-work.orig/arch/powerpc/include/asm/pte-hash64.h 2009-03-10
15:49:50.000000000 +1100
+++ linux-work/arch/powerpc/include/asm/pte-hash64.h 2009-03-10
15:49:55.000000000 +1100
@@ -41,6 +41,8 @@
#define _PTEIDX_SECONDARY 0x8
#define _PTEIDX_GROUP_IX 0x7
+/* Hash table based platforms need atomic updates of the linux PTE */
+#define PTE_ATOMIC_UPDATES 1
#ifdef CONFIG_PPC_64K_PAGES
#include <asm/pte-hash64-64k.h>
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