linux-kernel - Re: [PATCH 1/3] x86/entry/64: Refactor IRQ stacks and make then NMI-safe

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Message-ID: <CALCETrV_ei6jJyzf8HFEZqUwk4k+SR+Ze=iwuXDmMYDynWDrjg@mail.gmail.com>
Date:	Wed, 5 Aug 2015 11:24:54 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Brian Gerst <brgerst@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>, Willy Tarreau <w@....eu>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 1/3] x86/entry/64: Refactor IRQ stacks and make then NMI-safe

On Wed, Aug 5, 2015 at 1:59 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Andy Lutomirski <luto@...nel.org> wrote:
>
>> --- a/arch/x86/kernel/process_64.c
>> +++ b/arch/x86/kernel/process_64.c
>> @@ -280,6 +280,10 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
>>       unsigned fsindex, gsindex;
>>       fpu_switch_t fpu_switch;
>>
>> +#ifdef CONFIG_DEBUG_ENTRY
>> +     WARN_ON(this_cpu_read(irq_count));
>> +#endif
>
> Please introduce a less noisy (to the eyes) version of this, something like:
>
>         WARN_ON_DEBUG_ENTRY(this_cpu_read(irq_count));
>
> or so, similar to WARN_ON_FPU().

I can do that (or "DEBUG_ENTRY_WARN_ON"?  we seem to be inconsistent
about ordering).

Or would if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) WARN_ON(...) be better?

--Andy

>
> Thanks,
>
>         Ingo



-- 
Andy Lutomirski
AMA Capital Management, LLC
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