From ee4ed6fa5af0009a1205498d1f754fecc7af7657 Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Fri, 14 Mar 2014 17:03:58 +1100 Subject: [PATCH] powerpc: Rate-limit users spamming kernel log buffer The facility unavailable exception can be triggered from userspace by accessing PMU registers when EBB is not enabled. This causes the included pr_err() to run, hence spamming the kernel log buffer. This avoids this by rate limiting these messages. Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/traps.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 33cd7a0..df86f0c 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1379,8 +1379,9 @@ void facility_unavailable_exception(struct pt_regs *regs) if (!arch_irq_disabled_regs(regs)) local_irq_enable(); - pr_err("%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n", - hv ? "Hypervisor " : "", facility, regs->nip, regs->msr); + pr_err_ratelimited( + "%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n", + hv ? "Hypervisor " : "", facility, regs->nip, regs->msr); if (user_mode(regs)) { _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); -- 2.7.4