From: Joe Perches <joe@perches.com>
To: Julia Lawall <julia.lawall@lip6.fr>,
Colin King <colin.king@canonical.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>,
Kalle Valo <kvalo@codeaurora.org>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] wireless: iwlegacy: make const array static to shink object code size Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit
Date: Fri, 22 Sep 2017 03:03:08 -0700 [thread overview]
Message-ID: <1506074588.12311.37.camel@perches.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1709220921350.2024@hadrien>
On Fri, 2017-09-22 at 09:23 +0200, Julia Lawall wrote:
>
> On Thu, 21 Sep 2017, Colin King wrote:
>
> > From: Colin Ian King <colin.king@canonical.com>
> >
> > Don't populate const array ac_to_fifo on the stack in an inlined
> > function, instead make it static. Makes the object code smaller
> > by over 800 bytes:
> >
> > text data bss dec hex filename
> > 159029 33154 1216 193399 2f377 4965-mac.o
> >
> > text data bss dec hex filename
> > 158122 33250 1216 192588 2f04c 4965-mac.o
> >
> > (gcc version 7.2.0 x86_64)
>
> Gcc 7 must be much more aggressive about inlining than gcc 4. Here is the
> change that I got on this file:
>
> text data bss dec hex filename
> - 76346 1494 152 77992 130a8 drivers/net/wireless/intel/iwlegacy/4965-mac.o
> + 76298 1494 152 77944 13078 drivers/net/wireless/intel/iwlegacy/4965-mac.o
> decrease of 48
More likely different CONFIG options.
e.g. allyesconfig vs defconfig with wireless
next prev parent reply other threads:[~2017-09-22 10:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-21 22:56 [PATCH] wireless: iwlegacy: make const array static to shink object code size Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Colin King
2017-09-22 6:00 ` Johannes Berg
2017-09-22 7:23 ` Julia Lawall
2017-09-22 10:03 ` Joe Perches [this message]
2017-09-22 10:05 ` Colin Ian King
2017-09-22 10:06 ` Julia Lawall
2017-09-22 10:46 ` Joe Perches
2017-09-22 10:54 ` Julia Lawall
2017-09-22 9:56 ` Stanislaw Gruszka
2017-09-22 10:32 ` Kalle Valo
2017-09-25 8:29 ` iwlegacy: make const array static to shink object code size Kalle Valo
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