[PATCH] mm: powerpc init_mm without ptlock

Restore an earlier mod which went missing in the powerpc reshuffle: the 4xx
mmu_mapin_ram does not need to take init_mm.page_table_lock.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/arch/powerpc/mm/4xx_mmu.c b/arch/powerpc/mm/4xx_mmu.c
index b7bcbc232f39..4d006aa1a0d1 100644
--- a/arch/powerpc/mm/4xx_mmu.c
+++ b/arch/powerpc/mm/4xx_mmu.c
@@ -110,13 +110,11 @@ unsigned long __init mmu_mapin_ram(void)
                 pmd_t *pmdp;
                 unsigned long val = p | _PMD_SIZE_16M | _PAGE_HWEXEC | _PAGE_HWWRITE;
 
-                spin_lock(&init_mm.page_table_lock);
                 pmdp = pmd_offset(pgd_offset_k(v), v);
                 pmd_val(*pmdp++) = val;
                 pmd_val(*pmdp++) = val;
                 pmd_val(*pmdp++) = val;
                 pmd_val(*pmdp++) = val;
-                spin_unlock(&init_mm.page_table_lock);
 
                 v += LARGE_PAGE_SIZE_16M;
                 p += LARGE_PAGE_SIZE_16M;
@@ -127,10 +125,8 @@ unsigned long __init mmu_mapin_ram(void)
                 pmd_t *pmdp;
                 unsigned long val = p | _PMD_SIZE_4M | _PAGE_HWEXEC | _PAGE_HWWRITE;
 
-                spin_lock(&init_mm.page_table_lock);
                 pmdp = pmd_offset(pgd_offset_k(v), v);
                 pmd_val(*pmdp) = val;
-                spin_unlock(&init_mm.page_table_lock);
 
                 v += LARGE_PAGE_SIZE_4M;
                 p += LARGE_PAGE_SIZE_4M;