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

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Message-ID: <878tasfh3y.fsf@concordia.ellerman.id.au>
Date:   Fri, 16 Mar 2018 21:29:53 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Joe Perches <joe@...ches.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
Cc:     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()

Joe Perches <joe@...ches.com> writes:
> On Thu, 2018-03-15 at 14:57 +0300, Dan Carpenter wrote:
>> 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?
>
> And modern compilers create their own jump labels
> so this doesn't change object code either?

I must have missed the memo about us only changing source code if it
results in better object code.

cheers