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| author | Arseny Solokha <asolokha@kb.kras.ru> | 2015-02-04 05:18:02 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-02-04 05:19:27 +0300 |
| commit | c2c896bee08e1461fc24f9bf7dd57e2c63f6db70 (patch) | |
| tree | 35315d0675d8c56dd3b3861081c6653799375987 | |
| parent | 7f43e71e8c538356efd5b33a183e6d9ace4739a5 (diff) | |
| download | linux-c2c896bee08e1461fc24f9bf7dd57e2c63f6db70.tar.xz | |
powerpc/mm: Warn on flushing tlb page in kernel context
Function __flush_tlb_page() must only be called for user contexts, so
put in extra hardening to warn on calling it for kernel context.
Signed-off-by: Arseny Solokha <asolokha@kb.kras.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/mm/tlb_nohash.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c index ab0616b0e6c2..cbd3d069897f 100644 --- a/arch/powerpc/mm/tlb_nohash.c +++ b/arch/powerpc/mm/tlb_nohash.c @@ -284,7 +284,11 @@ void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr, struct cpumask *cpu_mask; unsigned int pid; - if (unlikely(!mm)) + /* + * This function as well as __local_flush_tlb_page() must only be called + * for user contexts. + */ + if (unlikely(WARN_ON(!mm))) return; preempt_disable(); |