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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>
This commit is contained in:
Sven Schnelle 2019-06-05 22:32:19 +02:00 committed by Helge Deller
parent 7e923369b1
commit e4eab1ce1f
1 changed files with 3 additions and 0 deletions
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3
arch/parisc/mm/fixmap.c
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@ -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);