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SubjectRe: [PATCH] lockdep: Noinstr annotate warn_bogus_irq_restore()
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On 2/9/21 8:03 AM, Peter Zijlstra wrote:
> On Tue, Feb 09, 2021 at 01:24:30PM +0000, Mark Rutland wrote:
>> On Tue, Feb 09, 2021 at 09:34:10AM +0100, Peter Zijlstra wrote:
>>>
>>> Subject: lockdep: Noinstr annotate warn_bogus_irq_restore()
>>> From: Peter Zijlstra <peterz@infradead.org>
>>> Date: Tue Feb 9 09:30:03 CET 2021
>>>
>>> vmlinux.o: warning: objtool: lock_is_held_type()+0x107: call to warn_bogus_irq_restore() leaves .noinstr.text section
>>>
>>> As per the general rule that WARNs are allowed to violate noinstr to
>>> get out, annotate it away.
>>>
>>> Fixes: 997acaf6b4b5 ("lockdep: report broken irq restoration")
>>> Reported-by: Randy Dunlap <rdunlap@infradead.org>
>>> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
>>
>> Whoops; sorry for missing that!
>>
>> Acked-by: Mark Rutland <mark.rutland@arm.com>
>
> This runs into sodding header hell on mips (and possibly others)
>
> How's this then?
>
> ---
> Subject: lockdep: Noinstr annotate warn_bogus_irq_restore()
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Tue Feb 9 09:30:03 CET 2021
>
> vmlinux.o: warning: objtool: lock_is_held_type()+0x107: call to warn_bogus_irq_restore() leaves .noinstr.text section
>
> As per the general rule that WARNs are allowed to violate noinstr to
> get out, annotate it away.
>
> Fixes: 997acaf6b4b5 ("lockdep: report broken irq restoration")
> Reported-by: Randy Dunlap <rdunlap@infradead.org>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> Acked-by: Mark Rutland <mark.rutland@arm.com>

Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested

Thanks.

> ---
> include/linux/irqflags.h | 5 ++++-
> kernel/locking/irqflag-debug.c | 4 +++-
> 2 files changed, 7 insertions(+), 2 deletions(-)
>
> --- a/kernel/locking/irqflag-debug.c
> +++ b/kernel/locking/irqflag-debug.c
> @@ -4,8 +4,10 @@
> #include <linux/export.h>
> #include <linux/irqflags.h>
>
> -void warn_bogus_irq_restore(void)
> +noinstr void warn_bogus_irq_restore(void)
> {
> + instrumentation_begin();
> WARN_ONCE(1, "raw_local_irq_restore() called with IRQs enabled\n");
> + instrumentation_end();
> }
> EXPORT_SYMBOL(warn_bogus_irq_restore);
>


--
~Randy


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