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authorKirill Tkhai <tkhai@yandex.ru>2013-04-09 00:29:46 +0400
committerDavid S. Miller <davem@davemloft.net>2013-04-08 22:50:47 -0400
commit07df841877195765d958df146f614fc7bdedd5e3 (patch)
tree9c749251ab90cd88b42f98c42e652f9b75b425b9 /arch/sparc/mm
parent598ec971ddcf7dcb0c381230e69a39c75b7fac1a (diff)
sparc64: Do not save/restore interrupts in get_new_mmu_context()
get_new_mmu_context() is always called with interrupts disabled. So it's possible to do this micro optimization. (Also fix the comment to switch_mm, which is called in both cases) Signed-off-by: Kirill Tkhai <tkhai@yandex.ru> CC: David Miller <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm')
-rw-r--r--arch/sparc/mm/init_64.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 076068f4459e..4ccaa1b9961f 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -681,10 +681,9 @@ void get_new_mmu_context(struct mm_struct *mm)
{
unsigned long ctx, new_ctx;
unsigned long orig_pgsz_bits;
- unsigned long flags;
int new_version;
- spin_lock_irqsave(&ctx_alloc_lock, flags);
+ spin_lock(&ctx_alloc_lock);
orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK);
ctx = (tlb_context_cache + 1) & CTX_NR_MASK;
new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx);
@@ -720,7 +719,7 @@ void get_new_mmu_context(struct mm_struct *mm)
out:
tlb_context_cache = new_ctx;
mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits;
- spin_unlock_irqrestore(&ctx_alloc_lock, flags);
+ spin_unlock(&ctx_alloc_lock);
if (unlikely(new_version))
smp_new_mmu_context_version();

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