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| author |   Sven Schnelle <svens@stackframe.org> | 2019-06-05 22:32:19 +0200 |
|---|---|---|
| committer |   Helge Deller <deller@gmx.de> | 2019-06-08 12:56:26 +0200 |
| commit | e4eab1ce1f679507c02ea48e6b6edaef33f8fee3 (patch) | |
| tree | aaf9850420e14e35ad3daa0e41f7ce9865cb6788 /arch/parisc | |
| parent | parisc: add spinlock to patch function (diff) | |
| download | linux-dev-e4eab1ce1f679507c02ea48e6b6edaef33f8fee3.tar.xz linux-dev-e4eab1ce1f679507c02ea48e6b6edaef33f8fee3.zip | |
parisc: add WARN_ON() to clear_fixmap
Calling clear_fixmap() on an already cleared fixed mapping is
a bad thing to do. Add a WARN_ON() to catch such issues.
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/mm/fixmap.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/parisc/mm/fixmap.c b/arch/parisc/mm/fixmap.c index c8d41b54fb19..36321bcd75ba 100644 --- a/arch/parisc/mm/fixmap.c +++ b/arch/parisc/mm/fixmap.c @@ -35,6 +35,9 @@ void clear_fixmap(enum fixed_addresses idx) pmd_t *pmd = pmd_offset(pgd, vaddr); pte_t *pte = pte_offset_kernel(pmd, vaddr); + if (WARN_ON(pte_none(*pte))) + return; + pte_clear(&init_mm, vaddr, pte); flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); |