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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2013-03-11 16:09:55 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:19:53 (GMT) |
| commit | 88552ea8ca29ad1f2c4a961f663f8c362df97fa7 (patch) | |
| tree | fa25227a86d0b102705f5761a3906f37345fb227 /arch/x86 | |
| parent | 24a92055470f7d51209baa08bc015564438d0e8a (diff) | |
| download | linux-fsl-qoriq-88552ea8ca29ad1f2c4a961f663f8c362df97fa7.tar.xz | |
x86/highmem: add a "already used pte" check
This is a copy from kmap_atomic_prot().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/mm/iomap_32.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c index 0c953e3..62377d6 100644 --- a/arch/x86/mm/iomap_32.c +++ b/arch/x86/mm/iomap_32.c @@ -65,6 +65,8 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot) type = kmap_atomic_idx_push(); idx = type + KM_TYPE_NR * smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + WARN_ON(!pte_none(*(kmap_pte - idx))); + #ifdef CONFIG_PREEMPT_RT_FULL current->kmap_pte[type] = pte; #endif |