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Blackfin arch: fix bug - MPU crashes under stress 

Bug Description:
a customer reported under IRQ stress, running applications may
wrongly trigger an ICPLB miss and be killed. after playing a
bit more, here's a test case that may be triggering the same bug.

Fixing:
After modifying page protections, only modify the active CPLBs if the
protection change was made for the active mm.

Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Bernd Schmidt 2008-08-25 18:41:15 +08:00 committed by Bryan Wu
parent 225f7e1eb5
commit 3d9b7a5ce5
1 changed files with 4 additions and 2 deletions
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6
include/asm-blackfin/mmu_context.h
View File

@ -173,8 +173,10 @@ static inline void protect_page(struct mm_struct *mm, unsigned long addr,
static inline void update_protections(struct mm_struct *mm)
{
flush_switched_cplbs();
set_mask_dcplbs(mm->context.page_rwx_mask);
if (mm->context.page_rwx_mask == current_rwx_mask) {
flush_switched_cplbs();
set_mask_dcplbs(mm->context.page_rwx_mask);
}
}
#endif