linux-kernel - Re: [PATCH 6/6] powerpc: powernv: no need to check return value of debugfs

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Message-ID: <20200210151915.GA686798@kroah.com>
Date:   Mon, 10 Feb 2020 07:19:15 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Oliver O'Halloran <oohall@...il.com>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Mackerras <paulus@...ba.org>,
        Sukadev Bhattiprolu <sukadev@...ux.ibm.com>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Subject: Re: [PATCH 6/6] powerpc: powernv: no need to check return value of
 debugfs_create functions

On Tue, Feb 11, 2020 at 02:01:53AM +1100, Oliver O'Halloran wrote:
> On Mon, Feb 10, 2020 at 12:12 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > When calling debugfs functions, there is no need to ever check the
> > return value.  The function can work or not, but the code logic should
> > never do something different based on this.
> 
> For memtrace debugfs is the only way to actually use the feature. It'd
> be nice if it still printed out *something* if it failed to create the
> files rather than just being mysteriously absent, but maybe debugfs
> itself does that. Looks fine otherwise.

No, debugfs will only spit out an error message to the log if a
file/directory is attempted to be created for an already present
file/directory.

For other failures, no error will be printed, other than the normal
lower-level "out of memory" issues that might rarely happen.

thanks,

greg k-h