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authorHeiko Carstens <heiko.carstens@de.ibm.com>2013-03-04 14:14:11 +0100
committerBen Hutchings <ben@decadent.org.uk>2013-03-27 02:41:00 +0000
commit5114f70796dbc6151443778679973f5f33bc4336 (patch)
treea5324583c2c257088a1638bea245502d61acb94c /arch/s390
parent0f6dbeb0217b0c165ff63cf0c2a9e5d682b1776c (diff)
s390/mm: fix flush_tlb_kernel_range()
commit f6a70a07079518280022286a1dceb797d12e1edf upstream. 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. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/tlbflush.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/include/asm/tlbflush.h b/arch/s390/include/asm/tlbflush.h
index 1d8648cf2fea..874302942c3f 100644
--- a/arch/s390/include/asm/tlbflush.h
+++ b/arch/s390/include/asm/tlbflush.h
@@ -74,8 +74,6 @@ static inline void __tlb_flush_idte(unsigned long asce)
static inline void __tlb_flush_mm(struct mm_struct * mm)
{
- if (unlikely(cpumask_empty(mm_cpumask(mm))))
- return;
/*
* If the machine has IDTE we prefer to do a per mm flush
* on all cpus instead of doing a local flush if the mm