linux-kernel - Re: [PATCH] [ppc] fix mot

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Date:	Wed, 30 May 2007 19:08:14 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Meelis Roos <mroos@...ux.ee>
Cc:	unlisted-recipients:; no To-header on input <""@mail.ravnborg.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [ppc] fix mot_info section

On Wed, May 30, 2007 at 07:14:49PM +0300, Meelis Roos wrote:
> The following patch makes mot_info __initdata since it is used only in 
> __init functions. prep_pci.c change has been tested in real life on 
> Motorola Powerstack II (compiles without modpost warnings and boots 
> fine), pplus.c has not been tested but seems similar.
> 
> Signed-off-by: Meelis Roos <mroos@...ux.ee>
> 
> diff --git a/arch/ppc/platforms/pplus.c b/arch/ppc/platforms/pplus.c
> index 8a1788c..9744108 100644
> --- a/arch/ppc/platforms/pplus.c
> +++ b/arch/ppc/platforms/pplus.c
> @@ -256,7 +256,7 @@ struct brd_info {
>  	const char *name;
>  	int (*map_irq) (struct pci_dev *, unsigned char, unsigned char);
>  };
> -struct brd_info mot_info[] = {
> +__initdata struct brd_info mot_info[] = {
>  	{0x300, 0x00, 0x00, "MVME 2400", Genesis2_map_irq},
>  	{0x1E0, 0xE0, 0x00, "Mesquite cPCI (MCP750)", mesquite_map_irq},
>  	{0x1E0, 0xE1, 0x00, "Sitka cPCI (MCPN750)", sitka_map_irq},
> diff --git a/arch/ppc/platforms/prep_pci.c b/arch/ppc/platforms/prep_pci.c
> index 1df3150..bdec1f1 100644
> --- a/arch/ppc/platforms/prep_pci.c
> +++ b/arch/ppc/platforms/prep_pci.c
> @@ -792,7 +792,7 @@ raven_init(void)
>  	return 1;
>  }
>  
> -struct mot_info {
> +__initdata struct mot_info {
>  	int		cpu_type;	/* 0x100 mask assumes for Raven and Hawk boards that the level/edge are set */
>  					/* 0x200 if this board has a Hawk chip. */
>  	int		base_type;

The way you place __initdata is bogus.
Please read following from init.h again:

 * For initialized data:
 * You should insert __initdata between the variable name and equal
 * sign followed by value, e.g.:
 *
 * static int init_variable __initdata = 0;
 * static char linux_logo[] __initdata = { 0x32, 0x36, ... };

If gcc happes to accept your placement does not make it correct.
It is still bogus and unreadable.

	Sam
-
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