linux-kernel - Re: Linux 3.10-rc6

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Message-ID: <51BF7ABD.3080508@caviumnetworks.com>
Date:	Mon, 17 Jun 2013 14:08:13 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	David Daney <david.daney@...ium.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: Linux 3.10-rc6

On 06/17/2013 01:59 PM, Andrew Morton wrote:
> On Mon, 17 Jun 2013 13:48:16 -0700 David Daney <ddaney@...iumnetworks.com> wrote:
>
>> On 06/17/2013 01:30 PM, Andrew Morton wrote:
>> [...]
>>>
>>> From: Andrew Morton <akpm@...ux-foundation.org>
>>> Subject: include/linux/smp.h:on_each_cpu(): switch back to a macro
>>>
>>> f21afc25f9ed4 ("smp.h: Use local_irq_{save,restore}() in !SMP version of
>>> on_each_cpu()") converted on_each_cpu() to a C function.  This required
>>> inclusion of irqflags.h, which broke ia64 and mn10300 (at least) due to
>>> header ordering hell.
>>>
>>> Switch on_each_cpu() back to a macro to fix this.
>>
>> FYI:  I have already sent a pair of patches that fix the include
>> dependencies:
>>
>> https://lkml.org/lkml/2013/6/16/113
>> https://lkml.org/lkml/2013/6/17/422
>
> I wasn't cc'ed.
>
>> Obviously, it is Linus' choice as to how best to handle the failure, but
>> I think it is important to know that there are two options (fixing ia64
>> and mn10300, or reverting the patch).
>
> I certainly prefer the inline function over a crappy macro.  The
> additional nested include is regrettable - more complexity.
>
> Also, it's good to have the SMP and non-SMP versions either both using
> macros or both using C.  Having them different can cause irritating
> unused-variable compilation warnings when using the macro version.

Although all these points are true, they are not why I wrote the patch.

The key difference, for me, between the SMP and !SMP versions is that 
the !SMP version unconditionally enables interrupts, and this enabling 
interrupts breaks my kernel

>
> I think switch-back-to-a-macro is simplest and safest for now.  Perhaps
> you can queue a 3.11 patch which restores the C function and fixes up
> mn10300 and ia64?
>

If the patch is reverted, I will do that.

David Daney

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