linux-kernel - Re: [PATCH] ARM: Re-enable TRACE_IRQFLAGS

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Message-ID: <CALszF6DPzhAufUyWW-a3X7Cp4=tjSyCBM=Y4LcnWnUH=41qeoQ@mail.gmail.com>
Date:	Tue, 9 Jun 2015 11:14:23 +0200
From:	Maxime Coquelin <mcoquelin.stm32@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: Re-enable TRACE_IRQFLAGS_SUPPORT on ARMv7-M

2015-06-09 0:47 GMT+02:00 Russell King - ARM Linux <linux@....linux.org.uk>:
> On Tue, Jun 09, 2015 at 12:24:48AM +0200, Maxime Coquelin wrote:
>> Commit cb1293e2f594 ("ARM: 8375/1: disable some options on ARMv7-M") causes
>> build failure on ARMv7-M machines:
>>
>>   CC      arch/arm/kernel/asm-offsets.s
>> In file included from include/linux/sem.h:5:0,
>>                  from include/linux/sched.h:35,
>>                  from arch/arm/kernel/asm-offsets.c:14:
>> include/linux/rcupdate.h: In function 'rcu_read_lock_sched_held':
>> include/linux/rcupdate.h:539:2: error: implicit declaration of function 'arch_irqs_disabled' [-Werror=implicit-function-declaration]
>>   return preempt_count() != 0 || irqs_disabled();
>>   ^
>
> The real solution is to provide a definition _in asm-generic_ for
> arch_irqs_disabled(), rather than having almost every arch doing:
>
> static inline bool arch_irqs_disabled(void)
> {
>         return arch_irqs_disabled_flags(arch_local_save_flags());
> }
>
> I'm personally refusing to take a patch for ARM which adds yet another
> copy of the above.  This is, after all, exactly the kind of stuff that
> should be in asm-generic, or if not, in include/linux but overridable
> by arch stuff.
>
> We keep going between the two extremes of "lets push lots of stuff into
> arch stuff" and "lets try to extract the common bits out of arch code".
>
> Let's try and settle on one approach, and apply it universally.

I agree on the idea but I don't measure all the impacts it would have.

>
> In the mean time, I think the right answer is to drop Arnd's patch -
> subsituting a randconfig build error for a useful-config build error
> is not something we want to do - and even partially reverting the
> patch results in randconfig build errors returning, so...

Ok, should I send a revert, or you can still drop Arnd's patch directly?

Thanks,
Maxime
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