Re: [PATCH v2] powerpc: Add const qual to local_read() parameter

[Stephen Rothwell <sfr@canb.auug.org.au>]

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Hi Dave,

On Wed, 20 Nov 2019 12:14:51 +1100 Michael Ellerman <mpe@ellerman.id.au> wrote:
>
> From: Eric Dumazet <edumazet@google.com>
> 
> A patch in net-next triggered a compile error on powerpc:
> 
>   include/linux/u64_stats_sync.h: In function 'u64_stats_read':
>   include/asm-generic/local64.h:30:37: warning: passing argument 1 of 'local_read' discards 'const' qualifier from pointer target type
> 
> This seems reasonable to relax powerpc local_read() requirements.
> 
> Fixes: 316580b69d0a ("u64_stats: provide u64_stats_t type")
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Reported-by: kbuild test robot <lkp@intel.com>
> Acked-by: Michael Ellerman <mpe@ellerman.id.au>
> ---
>  arch/powerpc/include/asm/local.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> v2: mpe: Update change log with compiler warning, resend to netdev so it appears
> in the netdev patchwork.
> 
> Dave can you take this in the net tree so the window of the breakage is as small
> as possible please?

I see that you marked this as "Not Applicable" in patchwork.

Michael meant the net-next tree which contains commit

  316580b69d0a ("u64_stats: provide u64_stats_t type")

Please consider applying this patch.

> diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h
> index fdd00939270b..bc4bd19b7fc2 100644
> --- a/arch/powerpc/include/asm/local.h
> +++ b/arch/powerpc/include/asm/local.h
> @@ -17,7 +17,7 @@ typedef struct
>  
>  #define LOCAL_INIT(i)	{ (i) }
>  
> -static __inline__ long local_read(local_t *l)
> +static __inline__ long local_read(const local_t *l)
>  {
>  	return READ_ONCE(l->v);
>  }
> -- 
> 2.21.0
> 

-- 
Cheers,
Stephen Rothwell

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