Messages in this thread | | | Date | Mon, 19 Nov 2018 12:41:51 +0100 | From | Sebastian Andrzej Siewior <> | Subject | Re: [PATCH] x86/fpu: Disable BH while while loading FPU registers in __fpu__restore_sig() |
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On 2018-11-12 09:48:08 [-0800], Dave Hansen wrote: > On 11/12/18 7:56 AM, Sebastian Andrzej Siewior wrote: > > Use local_bh_disable() around the restore sequence to avoid the race. BH > > needs to be disabled because BH is allowed to run (even with preemption > > disabled) and might invoke kernel_fpu_begin(). > > FWIW, that would make nice comment fodder for the local_bh_disable(). > I'd much rather run into it there than in a changelog.
Hmm. Should I really resent a v2 of this with the additional comment? This patch should go stable to the fix the bug and at the end of this series I remove/replace this hunk anyway. I can do either way, just wanted to check first.
Sebastian
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