linux-kernel - Re: [PATCH v3] MIPS: Fix build breakage caused by header file changes

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Date:   Tue, 7 Mar 2017 08:38:05 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     James Hogan <james.hogan@...tec.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v3] MIPS: Fix build breakage caused by header file changes


* James Hogan <james.hogan@...tec.com> wrote:

> Hi Guenter,
> 
> On Mon, Mar 06, 2017 at 11:13:55AM -0800, Guenter Roeck wrote:
> > Since commit f3ac60671954 ("sched/headers: Move task-stack related
> > APIs from <linux/sched.h> to <linux/sched/task_stack.h>") and commit
> > f780d89a0e82 ("sched/headers: Remove <asm/ptrace.h> from
> > <linux/sched.h>"), various mips builds fail as follows.
> > 
> > arch/mips/kernel/smp-mt.c: In function ‘vsmp_boot_secondary’:
> > arch/mips/include/asm/processor.h:384:41: error:
> > 	implicit declaration of function ‘task_stack_page’
> > 
> > In file included from
> > 	/opt/buildbot/slave/hwmon-testing/build/arch/mips/kernel/pm.c:
> > arch/mips/include/asm/fpu.h: In function '__own_fpu':
> > arch/mips/include/asm/processor.h:385:31: error:
> > 	invalid application of 'sizeof' to incomplete type 'struct pt_regs'
> 
> This one is in an inline function, so I think it'd affect multiple
> includes of <asm/fpu.h> even if __own_fpu isn't used, so I think the
> following patch which adds the include ptrace.h in fpu.h is more robust
> than adding to the individual c files affected:
> https://patchwork.linux-mips.org/patch/15386/
> 
> Admitedly it could probably have a more specific subject line since
> there are more similar errors.

Just a quick question: is your MIPS build fix going to be merged and sent to 
Linus? I can apply it too, and send it to Linus later today, together with a few 
other sched.h header related build fixes.

Assuming it's all properly tested - my limited MIPS defconfig builds worked fine - 
but MIPS has a lot of build variations.

Either way is fine to me.

Thanks,

	Ingo