linux-kernel - Re: [PATCH 5/6] sparc: use the asm-generic version of cpuinfo

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Date:   Fri, 26 Aug 2022 19:41:16 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Conor.Dooley@...rochip.com
Cc:     mail@...chuod.ie, monstr@...str.eu, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, hca@...ux.ibm.com,
        gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
        ysato@...rs.sourceforge.jp, dalias@...c.org, davem@...emloft.net,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        arnd@...db.de, geert@...ux-m68k.org, keescook@...omium.org,
        peterz@...radead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH 5/6] sparc: use the asm-generic version of cpuinfo_op

On Fri, Aug 26, 2022 at 03:37:40PM +0000, Conor.Dooley@...rochip.com wrote:
> On 26/08/2022 15:47, Sam Ravnborg wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > 
> > Hi Conor.
> > 
> > Thanks for this nice simplification, but I think you can make it even
> > better.
> > 
> > On Sun, Aug 21, 2022 at 12:35:12PM +0100, Conor Dooley wrote:
> >> From: Conor Dooley <conor.dooley@...rochip.com>
> >>
> >> There's little point in duplicating the declaration of cpuinfo_op now
> >> that there's a shared version of it, so drop it & include the generic
> >> header.
> >>
> >> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> >> ---
> >>  arch/sparc/include/asm/cpudata.h | 3 +--
> >>  1 file changed, 1 insertion(+), 2 deletions(-)
> >>
> >> diff --git a/arch/sparc/include/asm/cpudata.h b/arch/sparc/include/asm/cpudata.h
> >> index d213165ee713..af6ef3c028a9 100644
> >> --- a/arch/sparc/include/asm/cpudata.h
> >> +++ b/arch/sparc/include/asm/cpudata.h
> >> @@ -6,8 +6,7 @@
> >>
> >>  #include <linux/threads.h>
> >>  #include <linux/percpu.h>
> >> -
> >> -extern const struct seq_operations cpuinfo_op;
> >> +#include <asm-generic/processor.h>
> > 
> > Since the header file did not need <asm-generic/processor.h> then it
> > should not need it now after deleting stuff.
> > The better fix is to add the missing include to arch/sparc/kernel/cpu.c,
> > where we have the user of it.
> > 
> > A header file should include what it needs, and no more.
> > 
> > I looked only at this patch, this comment may also be relevant for the
> > other patches.
> 
> Hey Sam, thanks for your feedback.
> As per Geert's suggestion, submitted a v2:
> https://lore.kernel.org/linux-riscv/20220825205942.1713914-1-mail@conchuod.ie/T/#u
> 
> In v2, I included linux/processor.h instead of an asm-generic header.
> The diff for sparc became:
> 
> diff --git a/arch/sparc/include/asm/cpudata.h b/arch/sparc/include/asm/cpudata.h
> index d213165ee713..f7e690a7860b 100644
> --- a/arch/sparc/include/asm/cpudata.h
> +++ b/arch/sparc/include/asm/cpudata.h
> @@ -7,8 +7,6 @@
>  #include <linux/threads.h>
>  #include <linux/percpu.h>
>  
> -extern const struct seq_operations cpuinfo_op;
> -
>  #endif /* !(__ASSEMBLY__) */
>  
>  #if defined(__sparc__) && defined(__arch64__)
> diff --git a/arch/sparc/kernel/cpu.c b/arch/sparc/kernel/cpu.c
> index 79cd6ccfeac0..ffdc7a825b80 100644
> --- a/arch/sparc/kernel/cpu.c
> +++ b/arch/sparc/kernel/cpu.c
> @@ -12,6 +12,7 @@
>  #include <linux/smp.h>
>  #include <linux/threads.h>
>  #include <linux/pgtable.h>
> +#include <linux/processor.h>
>  
>  #include <asm/spitfire.h>
>  #include <asm/oplib.h>
> 
> Hopefully that is more appealing to you!
> Thanks,
> Conor.

Hi Conor - much better. Thanks.

	Sam