linux-kernel - Re: [PATCH 1/1] HID: microsoft, fix invalid rdesc for 3k kbd

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Date:	Sun, 4 Nov 2012 22:06:49 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	jkosina@...e.cz, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	stable@...r.kernel.org
Subject: Re: [PATCH 1/1] HID: microsoft, fix invalid rdesc for 3k kbd

On Fri, Oct 19, 2012 at 1:28 PM, Jiri Slaby <jslaby@...e.cz> wrote:
> +       if ((quirks & MS_RDESC_3K) && *rsize == 106 &&
> +                       !memcmp((char []){ 0x19, 0x00, 0x29, 0xff },
> +                               &rdesc[94], 4)) {

Which version of gcc are you using?

I'm getting (m68k-linux-gnu-gcc 4.1.2):

drivers/hid/hid-microsoft.c:51:18: error: macro "memcmp" passed 6
arguments, but takes just 3
drivers/hid/hid-microsoft.c: In function ‘ms_report_fixup’:
drivers/hid/hid-microsoft.c:50: error: ‘memcmp’ undeclared (first use
in this function)
drivers/hid/hid-microsoft.c:50: error: (Each undeclared identifier is
reported only once
/drivers/hid/hid-microsoft.c:50: error: for each function it appears in.)

Extracted into this test case:

---snip---
#include <string.h>

#define memcmp(a, b, c) memcmp((a), (b), (c))

int f(unsigned char *rdesc)
{
    return memcmp((char []){ 0x19, 0x00, 0x29, 0xff }, &rdesc[94], 4);
}
---snip---

it also fails with gcc-3.4/4.1/4.2/4.3/4.4 of Ubuntu 10.04 on amd64.

Interestingly, it doesn't fail if I remove the #define for memcmp. So it seems
to work if memcmp() is a real function, not a #define.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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