linux-kernel - Re: [PATCH] mm/early_ioremap: add explicit #include of asm/early

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Date:	Thu, 10 Sep 2015 12:35:19 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] mm/early_ioremap: add explicit #include of
 asm/early_ioremap.h

On Thu, 2015-09-10 at 18:00 +0200, Ard Biesheuvel wrote:
> Commit 6b0f68e32ea8 ("mm: add utility for early copy from unmapped
> ram") introduces a function copy_from_early_mem() into mm/early_ioremap.c
> which itself calls early_memremap()/early_memunmap(). However, since
> early_memunmap() has not been declared yet at this point in the .c file,
> nor by any explicitly included header files, we are depending on a
> transitive include of asm/early_ioremap.h to declare it, which is fragile.
> 
> So instead, include this header explicitly.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> ---

Acked-by: Mark Salter <msalter@...hat.com>

> 
> I ran into this by accident when trying to enable to the generic ioremap
> implementation for 32-bit ARM.
> 
>  mm/early_ioremap.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
> index 23f744d77ce0..17ae14b5aefa 100644
> --- a/mm/early_ioremap.c
> +++ b/mm/early_ioremap.c
> @@ -15,6 +15,7 @@
>  #include <linux/mm.h>
>  #include <linux/vmalloc.h>
>  #include <asm/fixmap.h>
> +#include <asm/early_ioremap.h>
>  
>  #ifdef CONFIG_MMU
>  static int early_ioremap_debug __initdata;

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