linux-kernel - Re: [PATCH] powerpc: Use common error handling code in setup_new

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Date:   Fri, 16 Mar 2018 13:35:11 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>,
        SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linuxppc-dev@...ts.ozlabs.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...e.de>,
        Brijesh Singh <brijesh.singh@....com>,
        Josh Sklar <sklar@...ux.vnet.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] powerpc: Use common error handling code in
 setup_new_fdt()

On Fri, Mar 16, 2018 at 09:26:53PM +1100, Michael Ellerman wrote:
> Dan Carpenter <dan.carpenter@...cle.com> writes:
> > On Wed, Mar 14, 2018 at 06:22:07PM -0300, Thiago Jung Bauermann wrote:
> >> SF Markus Elfring <elfring@...rs.sourceforge.net> writes:
> >> > From: Markus Elfring <elfring@...rs.sourceforge.net>
> >> > Date: Sun, 11 Mar 2018 09:03:42 +0100
> >> >
> >> > Add a jump target so that a bit of exception handling can be better reused
> >> > at the end of this function.
> >> >
> >> > This issue was detected by using the Coccinelle software.
> >> >
> >> > Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> >> > ---
> >> >  arch/powerpc/kernel/machine_kexec_file_64.c | 28 ++++++++++++----------------
> >> >  1 file changed, 12 insertions(+), 16 deletions(-)
> >> 
> >> I liked it. Thanks!
> >> 
> >> Reviewed-by: Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
> >
> > You know that compilers already re-use string constants so this doesn't
> > actually save memory?
> 
> Sure, but it's still clearer to only have the string appear once in the
> code.
> 

To me the original was better.

> > Also we should be preserving the error codes
> > instead of always returning -EINVAL.
> 
> The error codes come from libfdt code, so they don't necessarily make
> sense in the kernel. eg. FDT_ERR_NOSPACE == 3 == ESRCH.
> 
> Perhaps we should be trying harder to convert them, but that's a
> criticism of the original code not this patch.

Ah.  You're right.  I look at the patch in context, sorry.

regards,
dan carpenter