linux-kernel - Re: IB/mlx4: Use common error handling code in __mlx4_ib_create

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Date:   Mon, 30 Oct 2017 09:04:36 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Leon Romanovsky <leon@...nel.org>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org
Cc:     Hal Rosenstock <hal.rosenstock@...il.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Yuval Shaia <yuval.shaia@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: IB/mlx4: Use common error handling code in
 __mlx4_ib_create_flow()

>>> I mean you aren't really making the code any smaller
>>
>> Would anybody like to check corresponding effects in more detail
>> after a specific function call was replaced by a goto statement?
> 
> You are supposed to do it and not "anybody".

I can offer another bit of information for this software development discussion.

The following build settings were active in my “Makefile” for this Linux test case.

…
HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O0 -fomit-frame-pointer -std=gnu89
…


The affected source file can be compiled for the processor architecture “x86_64”
by a tool like “GCC 6.4.1+r251631-1.3” from the software distribution
“openSUSE Tumbleweed” with the following command example.

my_cc=/usr/bin/gcc-6 \
&& my_module=drivers/infiniband/hw/mlx4/main.o \
&& git checkout next-20171009 \
&& make -j4 CC="${my_cc}" HOSTCC="${my_cc}" allmodconfig "${my_module}" \
&& size "${my_module}" \
&& git checkout next_fine-tuning_in_mlx4_1 \
&& make -j4 CC="${my_cc}" HOSTCC="${my_cc}" allmodconfig "${my_module}" \
&& size "${my_module}"


Do you find the following details useful for further clarification?

text: -32
data: 0
bss:  0

Regards,
Markus