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Diffstat (limited to 'include/asm-ppc/pgtable.h')
-rw-r--r--include/asm-ppc/pgtable.h29
1 files changed, 25 insertions, 4 deletions
diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h
index 19dfb7abaa2..2e88cd9feff 100644
--- a/include/asm-ppc/pgtable.h
+++ b/include/asm-ppc/pgtable.h
@@ -526,10 +526,10 @@ extern void add_hash_page(unsigned context, unsigned long va,
* Atomic PTE updates.
*
* pte_update clears and sets bit atomically, and returns
- * the old pte value.
- * The ((unsigned long)(p+1) - 4) hack is to get to the least-significant
- * 32 bits of the PTE regardless of whether PTEs are 32 or 64 bits.
+ * the old pte value. In the 64-bit PTE case we lock around the
+ * low PTE word since we expect ALL flag bits to be there
*/
+#ifndef CONFIG_PTE_64BIT
static inline unsigned long pte_update(pte_t *p, unsigned long clr,
unsigned long set)
{
@@ -543,10 +543,31 @@ static inline unsigned long pte_update(pte_t *p, unsigned long clr,
" stwcx. %1,0,%3\n\
bne- 1b"
: "=&r" (old), "=&r" (tmp), "=m" (*p)
- : "r" ((unsigned long)(p+1) - 4), "r" (clr), "r" (set), "m" (*p)
+ : "r" (p), "r" (clr), "r" (set), "m" (*p)
: "cc" );
return old;
}
+#else
+static inline unsigned long long pte_update(pte_t *p, unsigned long clr,
+ unsigned long set)
+{
+ unsigned long long old;
+ unsigned long tmp;
+
+ __asm__ __volatile__("\
+1: lwarx %L0,0,%4\n\
+ lwzx %0,0,%3\n\
+ andc %1,%L0,%5\n\
+ or %1,%1,%6\n"
+ PPC405_ERR77(0,%3)
+" stwcx. %1,0,%4\n\
+ bne- 1b"
+ : "=&r" (old), "=&r" (tmp), "=m" (*p)
+ : "r" (p), "r" ((unsigned long)(p) + 4), "r" (clr), "r" (set), "m" (*p)
+ : "cc" );
+ return old;
+}
+#endif
/*
* set_pte stores a linux PTE into the linux page table.