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| author | David S. Miller <davem@davemloft.net> | 2009-09-11 20:35:13 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-09-11 20:35:13 -0700 |
| commit | cabc5c0f7fa1342049042d6e147db5a73773955b (patch) | |
| tree | 2be09ae1777d580c7dfe05d6d5b76e57281ec447 /arch/powerpc/mm/stab.c | |
| parent | b73d884756303316ead4cd7dad51236b2a515a1a (diff) | |
| parent | 86d710146fb9975f04c505ec78caa43d227c1018 (diff) | |
| download | linux-cabc5c0f7fa1342049042d6e147db5a73773955b.tar.gz linux-cabc5c0f7fa1342049042d6e147db5a73773955b.tar.bz2 linux-cabc5c0f7fa1342049042d6e147db5a73773955b.zip | |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Conflicts:
arch/sparc/Kconfig
Diffstat (limited to 'arch/powerpc/mm/stab.c')
| -rw-r--r-- | arch/powerpc/mm/stab.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/mm/stab.c b/arch/powerpc/mm/stab.c index 98cd1dc2ae75..ab5fb48b3e90 100644 --- a/arch/powerpc/mm/stab.c +++ b/arch/powerpc/mm/stab.c @@ -164,7 +164,7 @@ void switch_stab(struct task_struct *tsk, struct mm_struct *mm) { struct stab_entry *stab = (struct stab_entry *) get_paca()->stab_addr; struct stab_entry *ste; - unsigned long offset = __get_cpu_var(stab_cache_ptr); + unsigned long offset; unsigned long pc = KSTK_EIP(tsk); unsigned long stack = KSTK_ESP(tsk); unsigned long unmapped_base; @@ -172,6 +172,15 @@ void switch_stab(struct task_struct *tsk, struct mm_struct *mm) /* Force previous translations to complete. DRENG */ asm volatile("isync" : : : "memory"); + /* + * We need interrupts hard-disabled here, not just soft-disabled, + * so that a PMU interrupt can't occur, which might try to access + * user memory (to get a stack trace) and possible cause an STAB miss + * which would update the stab_cache/stab_cache_ptr per-cpu variables. + */ + hard_irq_disable(); + + offset = __get_cpu_var(stab_cache_ptr); if (offset <= NR_STAB_CACHE_ENTRIES) { int i; |