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authorLinus Torvalds <torvalds@linux-foundation.org>2014-12-18 16:32:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-18 16:32:11 -0800
commit28ee5809ff7365d935d217c387ba959b8aa7182f (patch)
treebf65008ea345162c0873114c53a61809e934bc5c
parent22943a6a6ba3bbbf5cc11cec409e779374e88107 (diff)
parent66d0f7ec9f1038452178b1993fc07fd96d30fd38 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Pull sparc fix from David Miller: "Sparc32 locking bug fix from Andreas Larsson" * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc: sparc32: destroy_context() and switch_mm() needs to disable interrupts.
-rw-r--r--arch/sparc/mm/srmmu.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index be65f035d18a..5cbc96d801ff 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -460,10 +460,12 @@ static void __init sparc_context_init(int numctx)
void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm,
struct task_struct *tsk)
{
+ unsigned long flags;
+
if (mm->context == NO_CONTEXT) {
- spin_lock(&srmmu_context_spinlock);
+ spin_lock_irqsave(&srmmu_context_spinlock, flags);
alloc_context(old_mm, mm);
- spin_unlock(&srmmu_context_spinlock);
+ spin_unlock_irqrestore(&srmmu_context_spinlock, flags);
srmmu_ctxd_set(&srmmu_context_table[mm->context], mm->pgd);
}
@@ -986,14 +988,15 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
void destroy_context(struct mm_struct *mm)
{
+ unsigned long flags;
if (mm->context != NO_CONTEXT) {
flush_cache_mm(mm);
srmmu_ctxd_set(&srmmu_context_table[mm->context], srmmu_swapper_pg_dir);
flush_tlb_mm(mm);
- spin_lock(&srmmu_context_spinlock);
+ spin_lock_irqsave(&srmmu_context_spinlock, flags);
free_context(mm->context);
- spin_unlock(&srmmu_context_spinlock);
+ spin_unlock_irqrestore(&srmmu_context_spinlock, flags);
mm->context = NO_CONTEXT;
}
}