Re: [PATCH] uvesafb: fix section mismatch warnings

[Sam Ravnborg <sam@ravnborg.org>]

On Fri, Jan 11, 2008 at 05:04:09PM -0800, Randy Dunlap wrote:
> From: Randy Dunlap <randy.dunlap@oracle.com>
> 
> Mark uvesafb_init_mtrr() as __devinit since its caller is __devinit
> and since it accesses __devinitdata.
> 
> WARNING: vmlinux.o(.text+0x4df80e): Section mismatch: reference to .init.data: (between 'uvesafb_init_mtrr' and 'uvesafb_show_vbe_ver')

OK

> 
> Variable 'blank' cannot be __devinitdata since it is referenced in an
> fb_ops method that could be called at any time.

The patch is correct but the explanation is wrong.
uvesafb uses local variables named blank in two spots that hides the
global defined blank which I assume has confused you.

The problematic spot is this use as a parameter:
module_param(blank, bool, 0);
MODULE_PARM_DESC(blank, "Enable hardware blanking");

This is at least how I understand it looking at the code.

	Sam



> 
> WARNING: vmlinux.o(.text+0x4dfc1e): Section mismatch: reference to .init.data:blank (between 'param_set_scroll' and 'vesa_setpalette')
> WARNING: vmlinux.o(.text+0x4dfc24): Section mismatch: reference to .init.data:blank (between 'param_set_scroll' and 'vesa_setpalette')
> 
> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
> ---
>  drivers/video/uvesafb.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> --- linux-2.6.24-rc7-git1.orig/drivers/video/uvesafb.c
> +++ linux-2.6.24-rc7-git1/drivers/video/uvesafb.c
> @@ -43,7 +43,7 @@ static struct fb_fix_screeninfo uvesafb_
>  };
>  
>  static int mtrr		__devinitdata = 3; /* enable mtrr by default */
> -static int blank	__devinitdata = 1; /* enable blanking by default */
> +static int blank	= 1;		   /* enable blanking by default */
>  static int ypan		__devinitdata = 1; /* 0: scroll, 1: ypan, 2: ywrap */
>  static int pmi_setpal	__devinitdata = 1; /* use PMI for palette changes */
>  static int nocrtc	__devinitdata; /* ignore CRTC settings */
> @@ -1549,7 +1549,7 @@ static void __devinit uvesafb_init_info(
>  		info->fbops->fb_pan_display = NULL;
>  }
>  
> -static void uvesafb_init_mtrr(struct fb_info *info)
> +static void __devinit uvesafb_init_mtrr(struct fb_info *info)
>  {
>  #ifdef CONFIG_MTRR
>  	if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
> ---
> ~Randy

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