Commit 3d9b7a5c authored Aug 25, 2008 by Bernd Schmidt Committed by Bryan Wu Aug 25, 2008

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>

parent 225f7e1e

include/asm-blackfin/mmu_context.h

+4 −2

Original line number	Diff line number	Diff line
		@@ -173,9 +173,11 @@ static inline void protect_page(struct mm_struct *mm, unsigned long addr,

		static inline void update_protections(struct mm_struct *mm)
		{
		if (mm->context.page_rwx_mask == current_rwx_mask) {
		flush_switched_cplbs();
		set_mask_dcplbs(mm->context.page_rwx_mask);
		}
		}
		#endif

		#endif