linux-kernel - Re: 2.6.23-rc2-mm1 -- PPC G5 kernel compile failure (patch)

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Date:	Thu, 9 Aug 2007 16:20:06 +0200
From:	Krzysztof Helt <krzysztof.h1@...pl>
To:	Andy Whitcroft <apw@...dowen.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, drfickle@...ibm.com, mel@....ul.ie
Subject: Re: 2.6.23-rc2-mm1 -- PPC G5 kernel compile failure (patch)

On Thu, 9 Aug 2007 14:04:49 +0100
Andy Whitcroft <apw@...dowen.org> wrote:

> Seeing the following compile error on a G5 mac:
> 
>   drivers/video/tdfxfb.c: In function 'tdfxfb_setup':
>   drivers/video/tdfxfb.c:1341: error: 'opt' undeclared (first use in this
>                                                                  function)
>   drivers/video/tdfxfb.c:1341: error: (Each undeclared identifier is
>                                                         reported only once
>   drivers/video/tdfxfb.c:1341: error: for each function it appears in.)
> 
> This seems to be the following fragment from tdfxfb-hardware-cursor:
> 
> +               } else if (!strcmp(this_opt, "hwcursor")) {
> +                       hwcursor = simple_strtoul(opt + 9, NULL, 0);
> 
> I guess the nieve fix would be s/opt/this_opt, but I am also
> suspicious of the +9 here as hwcursor is only 8 long?  Now this
> seems to take a numeric value and I assume that is via hwcursor=N,
> if so then the +9 would make sense _if_ the strcmp was against
> "hwcursor=".
> 

The patch below fixes all issues you have pointed out. It also fixes
the description of the nomtrr option.

---

From: Krzysztof Helt <krzysztof.h1@...pl>

This patch fixes compilation with setup options bug and corrects
description of the nomtrr option.

Signed-off-by: Krzysztof Helt <krzysztof.h1@...pl>

---

--- linux-2.6.22.new/drivers/video/tdfxfb.c	2007-08-09 16:11:23.870028259 +0200
+++ linux-2.6.23/drivers/video/tdfxfb.c	2007-08-09 16:15:07.654781024 +0200
@@ -1337,8 +1337,8 @@ static void tdfxfb_setup(char *options)
 			nopan = 1;
 		} else if (!strcmp(this_opt, "nowrap")) {
 			nowrap = 1;
-		} else if (!strcmp(this_opt, "hwcursor")) {
-			hwcursor = simple_strtoul(opt + 9, NULL, 0);
+		} else if (!strncmp(this_opt, "hwcursor=", 9)) {
+			hwcursor = simple_strtoul(this_opt + 9, NULL, 0);
 #ifdef CONFIG_MTRR
 		} else if (!strncmp(this_opt, "nomtrr", 6)) {
 			nomtrr = 1;
@@ -1409,7 +1409,7 @@ MODULE_PARM_DESC(hwcursor, "Enable hardw
 			"(1=enable, 0=disable, default=1)");
 #ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
-MODULE_PARM_DESC(nomtrr, "Disable MTRR support (0 or 1=disabled) (default=0)");
+MODULE_PARM_DESC(nomtrr, "Disable MTRR support (default: enabled)");
 #endif
 
 module_init(tdfxfb_init);
-
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