linux-kernel - Re: [PATCH 0/8] x86: audit and remove needless module.h includes

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Date:	Thu, 14 Jul 2016 11:18:39 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	<linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Juergen Gross <jgross@...e.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, <kvm@...r.kernel.org>,
	<x86@...nel.org>, <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH 0/8] x86: audit and remove needless module.h includes

[Re: [PATCH 0/8] x86: audit and remove needless module.h includes] On 14/07/2016 (Thu 15:04) Ingo Molnar wrote:

> 
> * Paul Gortmaker <paul.gortmaker@...driver.com> wrote:
> 
> > To that end, I have done allmodconfig, allyesconfig and allnoconfig
> > for both 32 bit and 64 bit x86 with these changes on the linux-next
> > from today, which presumably has an up to date copy of tip in it.
> 
> It does, still I get this on allnoconfig with your patches applied:

Took me a while to figure out why I didn't see this; I was able to
finally reproduce it on x86-32 with allnoconfig but CONFIG_SMP=y.

> 
> arch/x86/kernel/setup_percpu.c: In function ‘setup_percpu_segment’:
> arch/x86/kernel/setup_percpu.c:159:2: error: implicit declaration of function 
> ‘pack_descriptor’ [-Werror=implicit-function-declaration]
>   pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF,
>   ^
> arch/x86/kernel/setup_percpu.c:162:2: error: implicit declaration of function 
> ‘write_gdt_entry’ [-Werror=implicit-function-declaration]
>   write_gdt_entry(get_cpu_gdt_table(cpu),
>   ^
> arch/x86/kernel/setup_percpu.c:162:18: error: implicit declaration of function 
> ‘get_cpu_gdt_table’ [-Werror=implicit-function-declaration]
>   write_gdt_entry(get_cpu_gdt_table(cpu),

All three of these guys live in asm/desc.h and adding that to the top of
arch/x86/kernel/setup_percpu.c asm include list seems to fix the
reproducer I now have here.

> 
> I'll continue testing with the setup_percpu.c change left out.

Let me know if you want a resend or if you want to just add the
asm/desc.h locally or ...

Paul.
--

> 
> Thanks,
> 
> 	Ingo