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[PATCH] mm: cris v32 mmu_context_lock

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The cris v32 switch_mm guards get_mmu_context with next->page_table_lock: good
it's not really SMP yet, since get_mmu_context messes with global variables
affecting other mms.  Replace by global mmu_context_lock.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2005-10-29 18:16:37 -07:00 committed by Linus Torvalds
parent 92dc6fcc84
commit a7e4705b24
1 changed files with 4 additions and 2 deletions
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6
arch/cris/arch-v32/mm/tlb.c
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@ -175,6 +175,8 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0; return 0;
} }
static DEFINE_SPINLOCK(mmu_context_lock);
/* Called in schedule() just before actually doing the switch_to. */ /* Called in schedule() just before actually doing the switch_to. */
void void
switch_mm(struct mm_struct *prev, struct mm_struct *next, switch_mm(struct mm_struct *prev, struct mm_struct *next,
@ -183,10 +185,10 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
int cpu = smp_processor_id(); int cpu = smp_processor_id();
/* Make sure there is a MMU context. */ /* Make sure there is a MMU context. */
spin_lock(&next->page_table_lock); spin_lock(&mmu_context_lock);
get_mmu_context(next); get_mmu_context(next);
cpu_set(cpu, next->cpu_vm_mask); cpu_set(cpu, next->cpu_vm_mask);
spin_unlock(&next->page_table_lock); spin_unlock(&mmu_context_lock);
/* /*
* Remember the pgd for the fault handlers. Keep a seperate copy of it * Remember the pgd for the fault handlers. Keep a seperate copy of it