Commit e4eab1ce authored Jun 05, 2019 by Sven Schnelle Committed by Helge Deller Jun 08, 2019

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>

parent 7e923369

arch/parisc/mm/fixmap.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);

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