linux-kernel - Re: USB: core: Improve unlocking of a mutex in two functions

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Date:   Sun, 5 Nov 2017 10:33:15 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, kernel-janitors@...r.kernel.org
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Eugene Korenevsky <ekorenevsky@...il.com>,
        Günter Röck <linux@...ck-us.net>,
        Jaejoong Kim <climbbb.kim@...il.com>,
        Johan Hovold <johan@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: USB: core: Improve unlocking of a mutex in two functions

> Don't worry, or waste your time, I don't take patches from this author
> as they are in my blacklist.

I am curious if our dialogue can become more constructive again. 🌈


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

The affected source files 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_module1=drivers/usb/core/hub.o \
&& my_module2=drivers/usb/core/message.o \
&& git checkout next-20171102 \
&& make -j4 CC="${my_cc}" HOSTCC="${my_cc}" allmodconfig "${my_module1}" "${my_module2}" \
&& size "${my_module1}" "${my_module2}" \
&& git checkout ':/^USB: core: Improve unlocking of a mutex in two functions' \
&& make -j4 CC="${my_cc}" HOSTCC="${my_cc}" allmodconfig "${my_module1}" "${my_module2}" \
&& size "${my_module1}" "${my_module2}"


🔮 Do you find the following differences useful for further clarification?

╔═════════╤══════╗
║ module  │ text ║
╠═════════╪══════╣
║ hub     │ -16  ║
║ message │ -48  ║
╚═════════╧══════╝


Regards,
Markus