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| author | Kyle McMartin <kyle@infradead.org> | 2008-12-23 08:44:30 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-23 17:03:21 -0800 |
| commit | 5289f46b9de04bde181d833d48df9671b69c4b08 (patch) | |
| tree | 88bb3dbdb11e181cc267cb56c3c19e42e3630dbd | |
| parent | 8960223d5973b3eaf8cbc1984969bb6c7661e7b9 (diff) | |
| download | linux-stable-5289f46b9de04bde181d833d48df9671b69c4b08.tar.gz linux-stable-5289f46b9de04bde181d833d48df9671b69c4b08.tar.bz2 linux-stable-5289f46b9de04bde181d833d48df9671b69c4b08.zip | |
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.h | 5 |
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); |