Re: [PATCH 2/4] aio: Remove the now superfluous sentinel elements from ctl_table array

[Joel Granados]

On Thu, Nov 09, 2023 at 08:08:31AM -0800, Eric Biggers wrote:
> On Thu, Nov 09, 2023 at 05:00:40PM +0100, Joel Granados wrote:
> > > >  static void __init fsverity_init_sysctl(void)
> > > >  {
> > > > +#ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
> > > >  	fsverity_sysctl_header = register_sysctl("fs/verity",
> > > >  						 fsverity_sysctl_table);
> > > > +#else
> > > > +	fsverity_sysctl_header = register_sysctl_sz("fs/verity",
> > > > +						 fsverity_sysctl_table, 0);
> > > > +#endif
> > > >  	if (!fsverity_sysctl_header)
> > > >  		panic("fsverity sysctl registration failed");
> > > 
> > > This does not make sense, and it causes a build error when CONFIG_FS_VERITY=y
> > > and CONFIG_FS_VERITY_BUILTIN_SIGNATURES=n.
> > > 
> > > I think all you need to do is delete the sentinel element, the same as
> > > everywhere else.  I just tested it, and it works fine.
> > I found the reason why I added the CONFIG_FS_VERITY_BUILTIN_SIGNATURES
> > here: it is related to
> > https://lore.kernel.org/all/20230705212743.42180-3-ebiggers@xxxxxxxxxx/
> > where the directory is registered with an element only if
> > CONFIG_FS_VERITY_BUILTIN_SIGNATURES is defined. I had forgotten, but I
> > even asked for a clarification on the patch :).
> > 
> > I see that that patch made it to v6.6. So the solution is not to remove
> > the CONFIG_FS_VERITY_BUILTIN_SIGNATURES, but for me to rebase on top of
> > a more up to date base.
> > 
> > @Eric: Please get back to me if the patch in
> > https://lore.kernel.org/all/20230705212743.42180-3-ebiggers@xxxxxxxxxx/
> > is no longer relevant.
> > 
> > Best.
> 
> Yes, that patch was merged in 6.6.  I don't think it really matters here though,
> other than the fact that it moved the code to a different file.  I believe all
> you need to do is remove the sentinel element, the same as anywhere else:
Indeed. I thought that I had to handle empty array in a special way, but
it seems that ARRAY_SIZE works for empty arrays as well. I'll correct
this as well. Thx again for the feedback.

Best
> 
> diff --git a/fs/verity/init.c b/fs/verity/init.c
> index a29f062f6047b..b64a76b9ac362 100644
> --- a/fs/verity/init.c
> +++ b/fs/verity/init.c
> @@ -24,7 +24,6 @@ static struct ctl_table fsverity_sysctl_table[] = {
>  		.extra2         = SYSCTL_ONE,
>  	},
>  #endif
> -	{ }
>  };
>  
>  static void __init fsverity_init_sysctl(void)

-- 

Joel Granados

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