diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2013-03-11 17:09:55 +0100 |
|---|---|---|
| committer | Gary S. Robertson <gary.robertson@linaro.org> | 2014-06-06 15:24:09 -0500 |
| commit | 46730e8060872abb7401ae501bc8f0b480bfb87a (patch) | |
| tree | 403f8a2ecc795ff367ea658136bd528e9b7c83f5 /arch | |
| parent | 5f9d8d541182a92126e5594b12a0ffaf38fc0017 (diff) | |
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')
| -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 0c953e399b96..62377d67ab07 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 |