powerpc/mm: Use pte_raw() in pte_same()/pmd_same()

We can avoid doing endian conversions by using pte_raw() in pxx_same().
The swap of the constant (_PAGE_HPTEFLAGS) should be done at compile
time by the compiler.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
index 0a7956a..f4949f1 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -272,7 +272,7 @@ static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 #define __HAVE_ARCH_PMD_SAME
 static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
 {
-       return (((pmd_val(pmd_a) ^ pmd_val(pmd_b)) & ~_PAGE_HPTEFLAGS) == 0);
+       return (((pmd_raw(pmd_a) ^ pmd_raw(pmd_b)) & ~cpu_to_be64(_PAGE_HPTEFLAGS)) == 0);
 }
 
 static inline int __pmdp_test_and_clear_young(struct mm_struct *mm,

diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 7fc1a9a..22064bd 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -372,7 +372,11 @@ static inline int pgd_bad(pgd_t pgd)
 }
 
 #define __HAVE_ARCH_PTE_SAME
-#define pte_same(A,B)  (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
+static inline int pte_same(pte_t pte_a, pte_t pte_b)
+{
+       return (((pte_raw(pte_a) ^ pte_raw(pte_b)) & ~cpu_to_be64(_PAGE_HPTEFLAGS)) == 0);
+}
+
 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 {
        return (unsigned long)__va(pgd_val(pgd) & ~PGD_MASKED_BITS);