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| author | Thomas Gleixner <tglx@linutronix.de> | 2009-02-12 21:30:48 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-02-12 23:11:58 +0100 |
| commit | 34b0900d323122113683685b200aae9f9b75e63b (patch) | |
| tree | a7ebd50755ae7321e89a4e5a0b64e4a5a7de0dc4 /arch | |
| parent | d85cf93da66977dbc645352be1b2084a659d8a0b (diff) | |
| download | linux-3.10-34b0900d323122113683685b200aae9f9b75e63b.tar.gz linux-3.10-34b0900d323122113683685b200aae9f9b75e63b.tar.bz2 linux-3.10-34b0900d323122113683685b200aae9f9b75e63b.zip | |
x86: warn if arch_flush_lazy_mmu_cpu is called in preemptible context
Impact: Catch cases where lazy MMU state is active in a preemtible context
arch_flush_lazy_mmu_cpu() has been changed to disable preemption so
the checks in enter/leave will never trigger. Put the preemtible()
check into arch_flush_lazy_mmu_cpu() to catch such cases.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/paravirt.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index dcba6c567a2..c6520a4e85d 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -273,6 +273,7 @@ void arch_flush_lazy_mmu_mode(void) preempt_disable(); if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) { + WARN_ON(preempt_count() == 1); arch_leave_lazy_mmu_mode(); arch_enter_lazy_mmu_mode(); } @@ -285,6 +286,7 @@ void arch_flush_lazy_cpu_mode(void) preempt_disable(); if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) { + WARN_ON(preempt_count() == 1); arch_leave_lazy_cpu_mode(); arch_enter_lazy_cpu_mode(); } |