linux-kernel - RE: [RFC PATCH 00/11] ARM: s3c64xx: Let amba-pl08x driver handle DMA

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Date:	Thu, 20 Jun 2013 14:14:53 +0300
From:	Phil Carmody <phil.carmody@...tner.samsung.com>
To:	'Mark Brown' <broonie@...nel.org>
Cc:	'Tomasz Figa' <tomasz.figa@...il.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-spi@...r.kernel.org, alsa-devel@...a-project.org,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Vinod Koul' <vinod.koul@...el.com>,
	'Dan Williams' <djbw@...co>
Subject: RE: [RFC PATCH 00/11] ARM: s3c64xx: Let amba-pl08x driver handle DMA

> -----Original Message-----
> On Thu, Jun 20, 2013 at 12:24:47PM +0300, Phil Carmody wrote:
> > Can you just make that minimal change, and diff the objdump of the
> two .o's?
> > It would be worth a bug-report against the toolchain if different
> code
> > was being generated. If objdump spews huge numbers of diffs (due to
> > one address changing and pushing everything else out of kilter), then
> > feel free to forward both .o's or both objdumps to me, and I can run
> a
> > script over them, which knows to ignore unimportant address changes.
> 
> See Arnd's followup - this looks like a collision with the get_signal
> macro in signal.h.


With my language-lawyer hat on, I'd suggest ``(get_signal)'' to prevent the
macro expansion:

/tmp$ cat crap.c

#define fnlikemacro(foo) foo+

int x(int y) {
  int (fnlikemacro) = y;
  return fnlikemacro(y)(fnlikemacro);
}

/tmp$ gcc -E crap.c

int x(int y) {
  int (fnlikemacro) = y;
  return y+(fnlikemacro);
}

(and yes, that compiles.)

However, it's more tempting (i.e. sensible) to just rename the 
one with the weaker claim to the name.

Phil


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