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Commit ee4ed6fa authored by Michael Neuling's avatar Michael Neuling Committed by Benjamin Herrenschmidt
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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: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent e9aaac1a

arch/powerpc/kernel/traps.c

+3 −2
Original line number Original line Diff line number Diff line
@@ -1379,7 +1379,8 @@ void facility_unavailable_exception(struct pt_regs *regs) 
	if (!arch_irq_disabled_regs(regs))

	if (!arch_irq_disabled_regs(regs))

		local_irq_enable();

		local_irq_enable();





	pr_err("%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n",

	pr_err_ratelimited(

		"%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n",

		hv ? "Hypervisor " : "", facility, regs->nip, regs->msr);

		hv ? "Hypervisor " : "", facility, regs->nip, regs->msr);





	if (user_mode(regs)) {

	if (user_mode(regs)) {