From: Heiko Carstens Date: Mon, 4 Mar 2013 13:14:11 +0000 (+0100) Subject: s390/mm: fix flush_tlb_kernel_range() X-Git-Tag: v3.9-rc4~33^2~6 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6a70a07079518280022286a1dceb797d12e1edf;p=pandora-kernel.git s390/mm: fix flush_tlb_kernel_range() Our flush_tlb_kernel_range() implementation calls __tlb_flush_mm() with &init_mm as argument. __tlb_flush_mm() however will only flush tlbs for the passed in mm if its mm_cpumask is not empty. For the init_mm however its mm_cpumask has never any bits set. Which in turn means that our flush_tlb_kernel_range() implementation doesn't work at all. This can be easily verified with a vmalloc/vfree loop which allocates a page, writes to it and then frees the page again. A crash will follow almost instantly. To fix this remove the cpumask_empty() check in __tlb_flush_mm() since there shouldn't be too many mms with a zero mm_cpumask, besides the init_mm of course. Cc: stable@vger.kernel.org Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- Reading git-diff-tree failed