linux-kernel - Re: [PATCH] powerpc/cell/axon_msi: replace DEFINE_SIMPLE_ATTRIBUTE with DEFINE_DEBUGFS

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Date:   Wed, 22 Dec 2021 11:08:38 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     cgel.zte@...il.com, arnd@...db.de
Cc:     benh@...nel.crashing.org, paulus@...ba.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Changcheng Deng <deng.changcheng@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] powerpc/cell/axon_msi: replace DEFINE_SIMPLE_ATTRIBUTE
 with  DEFINE_DEBUGFS_ATTRIBUTE

cgel.zte@...il.com writes:
> From: Changcheng Deng <deng.changcheng@....com.cn>
>
> Fix the following coccicheck warning:
> ./arch/powerpc/platforms/cell/axon_msi.c: 456: 0-23: WARNING: fops_msic
> should be defined with DEFINE_DEBUGFS_ATTRIBUTE
>
> Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE for
> debugfs files.

But it also says:

  //# Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
  //# imposes some significant overhead as compared to
  //# DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().

Your patch doesn't change it to use debugfs_create_file_unsafe(),
shouldn't it?

cheers

> diff --git a/arch/powerpc/platforms/cell/axon_msi.c b/arch/powerpc/platforms/cell/axon_msi.c
> index 354a58c1e6f2..47bb0ae8d6c9 100644
> --- a/arch/powerpc/platforms/cell/axon_msi.c
> +++ b/arch/powerpc/platforms/cell/axon_msi.c
> @@ -453,7 +453,7 @@ static int msic_get(void *data, u64 *val)
>  	return 0;
>  }
>  
> -DEFINE_SIMPLE_ATTRIBUTE(fops_msic, msic_get, msic_set, "%llu\n");
> +DEFINE_DEBUGFS_ATTRIBUTE(fops_msic, msic_get, msic_set, "%llu\n");
>  
>  void axon_msi_debug_setup(struct device_node *dn, struct axon_msic *msic)
>  {
> -- 
> 2.25.1