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authorKyle McMartin <kyle@infradead.org>2008-12-23 08:44:30 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2008-12-23 17:03:21 -0800
commit5289f46b9de04bde181d833d48df9671b69c4b08 (patch)
tree88bb3dbdb11e181cc267cb56c3c19e42e3630dbd
parent8960223d5973b3eaf8cbc1984969bb6c7661e7b9 (diff)
downloadlinux-stericsson-5289f46b9de04bde181d833d48df9671b69c4b08.tar.gz
parisc: disable UP-optimized flush_tlb_mm
flush_tlb_mm's "optimized" uniprocessor case of allocating a new context for userspace is exposing a race where we can suddely return to a syscall with the protection id and space id out of sync, trapping on the next userspace access. Debugged-by: James Bottomley <James.Bottomley@HansenPartnership.com> Tested-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/parisc/include/asm/tlbflush.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/parisc/include/asm/tlbflush.h b/arch/parisc/include/asm/tlbflush.h
index b72ec66db699..1f6fd4fc05b9 100644
--- a/arch/parisc/include/asm/tlbflush.h
+++ b/arch/parisc/include/asm/tlbflush.h
@@ -44,9 +44,12 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
{
BUG_ON(mm == &init_mm); /* Should never happen */
-#ifdef CONFIG_SMP
+#if 1 || defined(CONFIG_SMP)
flush_tlb_all();
#else
+ /* FIXME: currently broken, causing space id and protection ids
+ * to go out of sync, resulting in faults on userspace accesses.
+ */
if (mm) {
if (mm->context != 0)
free_sid(mm->context);