Commit e4eab1ce authored by Sven Schnelle's avatar Sven Schnelle Committed by Helge Deller
Browse files

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: default avatarSven Schnelle <svens@stackframe.org>
Signed-off-by: default avatarHelge 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);