linux-kernel - Re: [PATCH v1 05/10] MIPS: MT: Move "weak" from vpe

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Message-ID: <CAErSpo6978-uGD6Mq+tESXVZsmZSLWCuAwyBzO9pKHg_foNZPg@mail.gmail.com>
Date:	Thu, 16 Oct 2014 07:49:05 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jason Wessel <jason.wessel@...driver.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...hat.com>,
	John Stultz <john.stultz@...aro.org>,
	Eric Paris <eparis@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH v1 05/10] MIPS: MT: Move "weak" from vpe_run() declaration
 to definition

[+cc Stephen]

On Wed, Oct 15, 2014 at 5:28 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> [+cc linux-mips]
>
> On Wed, Oct 15, 2014 at 11:06 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> When the "weak" attribute is on a declaration in a header file, every
>> definition where the header is included becomes weak, and the linker
>> chooses one definition based on link order (see 10629d711ed7 ("PCI: Remove
>> __weak annotation from pcibios_get_phb_of_node decl")).
>>
>> Move the "weak" attribute from the declaration to the default definition so
>> we always prefer a non-weak definition over the weak one, independent of
>> link order.
>>
>> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
>> CC: linux-mips@...ux-mips.org
>> ---
>>  arch/mips/include/asm/vpe.h |    2 +-
>>  arch/mips/kernel/vpe-mt.c   |    2 +-
>>  2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/mips/include/asm/vpe.h b/arch/mips/include/asm/vpe.h
>> index 7849f3978fea..80e70dbd1f64 100644
>> --- a/arch/mips/include/asm/vpe.h
>> +++ b/arch/mips/include/asm/vpe.h
>> @@ -122,7 +122,7 @@ void release_vpe(struct vpe *v);
>>  void *alloc_progmem(unsigned long len);
>>  void release_progmem(void *ptr);
>>
>> -int __weak vpe_run(struct vpe *v);
>> +int vpe_run(struct vpe *v);
>>  void cleanup_tc(struct tc *tc);
>>
>>  int __init vpe_module_init(void);
>> diff --git a/arch/mips/kernel/vpe-mt.c b/arch/mips/kernel/vpe-mt.c
>> index 2e003b11a098..0e5899a2cd96 100644
>> --- a/arch/mips/kernel/vpe-mt.c
>> +++ b/arch/mips/kernel/vpe-mt.c
>> @@ -23,7 +23,7 @@ static int major;
>>  static int hw_tcs, hw_vpes;
>>
>>  /* We are prepared so configure and start the VPE... */
>> -int vpe_run(struct vpe *v)
>> +int __weak vpe_run(struct vpe *v)
>>  {
>>         unsigned long flags, val, dmt_flag;
>>         struct vpe_notifications *notifier;
>>

Just FYI, this patch was in linux-next today, but I dropped it
temporarily because Fengguang's auto-builder found the following issue
with it:

All error/warnings:

   arch/mips/kernel/vpe.c: In function 'vpe_release':
>> arch/mips/kernel/vpe.c:830:29: error: the address of 'vpe_run' will always evaluate as 'true' [-Werror=address]
      if ((vpe_elfload(v) >= 0) && vpe_run) {
                                ^
   cc1: all warnings being treated as errors
--
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