Messages in this thread | | | Date | Fri, 5 Aug 2022 16:27:40 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH v3] x86,mm: print likely CPU at segfault time |
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On Fri, Aug 05, 2022 at 10:16:44AM -0400, Rik van Riel wrote: > diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c > index fad8faa29d04..c7a5bbf40367 100644 > --- a/arch/x86/mm/fault.c > +++ b/arch/x86/mm/fault.c > @@ -769,6 +769,8 @@ show_signal_msg(struct pt_regs *regs, unsigned long error_code, > unsigned long address, struct task_struct *tsk) > { > const char *loglvl = task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG; > + /* This is a racy snapshot, but it's better than nothing. */ > + int cpu = raw_smp_processor_id();
Please read this in exc_page_fault() and hand it down to helpers.
Alternatively, I'm being told there's a patchset in the works which will allow for any exception handler to pass in additional information downwards through an extended pt_regs. Then, saving the CPU number on which the handler is running would work generically everywhere.
Thx.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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