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authorDavid S. Miller <davem@sunset.davemloft.net>2006-03-06 19:59:50 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 01:14:20 -0800
commita77754b4d0731321db266c6c60ffcd7c62757da5 (patch)
tree37cc4c6793e2b616791d42ee840e5a007a13eccb /arch/sparc64
parent9132983ae140a8ca81e95e081d5a4c0dd7a7f670 (diff)
downloadop-kernel-dev-a77754b4d0731321db266c6c60ffcd7c62757da5.zip
op-kernel-dev-a77754b4d0731321db266c6c60ffcd7c62757da5.tar.gz
[SPARC64]: Bulletproof MMU context locking.
1) Always spin_lock_init() in init_context(). The caller essentially clears it out, or copies the mm info from the parent. In both cases we need to explicitly initialize the spinlock. 2) Always do explicit IRQ disabling while taking mm->context.lock and ctx_alloc_lock. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/mm/init.c5
-rw-r--r--arch/sparc64/mm/tsb.c1
2 files changed, 4 insertions, 2 deletions
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 9bbd0bf6..a639393 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -639,9 +639,10 @@ 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(&ctx_alloc_lock);
+ spin_lock_irqsave(&ctx_alloc_lock, flags);
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);
@@ -677,7 +678,7 @@ 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(&ctx_alloc_lock);
+ spin_unlock_irqrestore(&ctx_alloc_lock, flags);
if (unlikely(new_version))
smp_new_mmu_context_version();
diff --git a/arch/sparc64/mm/tsb.c b/arch/sparc64/mm/tsb.c
index 534ac28..f36799b 100644
--- a/arch/sparc64/mm/tsb.c
+++ b/arch/sparc64/mm/tsb.c
@@ -354,6 +354,7 @@ void tsb_grow(struct mm_struct *mm, unsigned long rss, gfp_t gfp_flags)
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
+ spin_lock_init(&mm->context.lock);
mm->context.sparc64_ctx_val = 0UL;
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