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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2013-03-11 17:09:55 +0100 |
|---|---|---|
| committer | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-02-13 00:36:28 +0100 |
| commit | 130435411fd0a2bb8c120645b5e34653b764500e (patch) | |
| tree | a94d9949e6ed7091c07bc6dd83fc7064429a43e0 | |
| parent | fd9d77c6e5a5f8ee502fd455d281c9e88ba0c297 (diff) | |
| download | rt-linux-130435411fd0a2bb8c120645b5e34653b764500e.tar.gz | |
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>
| -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 5a72574f91f36..dd25dd1671b6a 100644 --- a/arch/x86/mm/iomap_32.c +++ b/arch/x86/mm/iomap_32.c @@ -66,6 +66,8 @@ 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 |