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authorThomas Gleixner <tglx@linutronix.de>2015-05-07 14:35:59 +0200
committerIngo Molnar <mingo@kernel.org>2015-05-07 16:15:50 +0200
commit6b442bc81337913eb775965a67ffdb8a36935422 (patch)
treec98932b4f91567c23eb77bb6596a0d1fa5207036 /Kbuild
parent38d23a6cc16c02f7b0c920266053f340b5601735 (diff)
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nohz: Fix !HIGH_RES_TIMERS hang
Simon Horman reported this crash on a system with high-res timers disabled but nohz enabled: > ------------[ cut here ]------------ > kernel BUG at kernel/irq_work.c:135! BUG_ON(!irqs_disabled()); So something enabled interrupts in the periodic tick handling machinery, and that code path indeed has a local_irq_disable()/enable pair in tick_nohz_switch_to_nohz() which causes havoc. Fix it. This patch also fixes a +nohz -hrtimers hang reported by Ingo Molnar. Reported-by: Simon Horman <horms@verge.net.au> Reported-by: Ingo Molnar <mingo@kernel.org> Tested-by: Simon Horman <horms@verge.net.au> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: LAK <linux-arm-kernel@lists.infradead.org> Cc: Magnus Damm <magnus.damm@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1505071425520.4225@nanos Signed-off-by: Ingo Molnar <mingo@kernel.org>
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