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

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Date:   Mon, 30 Oct 2017 10:34:02 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        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()

On Mon, Oct 30, 2017 at 09:04:36AM +0100, SF Markus Elfring wrote:
> >>> 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?

Almost, you should compare sizes of mlx4_ib.ko and not drivers/infiniband/hw/mlx4/main.o.

Thanks

>
> text: -32
> data: 0
> bss:  0
>
> Regards,
> Markus

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