linux-kernel - Re: [PATCH] arm: fixmap: Annotate page flags with pgprot

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Date:	Thu, 25 Feb 2016 10:26:40 -0800
From:	Stefan Agner <stefan@...er.ch>
To:	Suzuki K Poulose <suzuki.poulose@....com>
Cc:	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [PATCH] arm: fixmap: Annotate page flags with pgprot

On 2016-02-25 09:42, Suzuki K Poulose wrote:
> With STRICT_MM_TYPECHECKS, the kernel build fails like :
> 
>   CC      mm/early_ioremap.o
> mm/early_ioremap.c: In function ‘early_ioremap’:
> mm/early_ioremap.c:211:2: error: incompatible type for argument 3 of
> ‘__early_ioremap’
> mm/early_ioremap.c:98:1: note: expected ‘pgprot_t’ but argument is of
> type ‘long long unsigned int’
> mm/early_ioremap.c: In function ‘early_memremap’:
> mm/early_ioremap.c:219:13: error: incompatible type for argument 3 of
> ‘__early_ioremap’
> mm/early_ioremap.c:98:1: note: expected ‘pgprot_t’ but argument is of
> type ‘long long unsigned int’
> mm/early_ioremap.c: In function ‘early_memremap_ro’:
> mm/early_ioremap.c:225:2: error: incompatible type for argument 3 of
> ‘__early_ioremap’
> mm/early_ioremap.c:98:1: note: expected ‘pgprot_t’ but argument is of
> type ‘long long unsigned int’
> mm/early_ioremap.c:226:1: warning: control reaches end of non-void
> function [-Wreturn-type]
> mm/early_ioremap.c: In function ‘early_memremap’:
> mm/early_ioremap.c:220:1: warning: control reaches end of non-void
> function [-Wreturn-type]
> mm/early_ioremap.c: In function ‘early_ioremap’:
> mm/early_ioremap.c:212:1: warning: control reaches end of non-void
> function [-Wreturn-type]
> make[1]: *** [mm/early_ioremap.o] Error 1
> make: *** [mm] Error 2
> make: *** Waiting for unfinished jobs....
>   CC      arch/arm/mm/mmu.o
>   CC      arch/arm/kernel/patch.o
> arch/arm/kernel/patch.c: In function ‘patch_map’:
> arch/arm/kernel/patch.c:39:2: error: incompatible type for argument 3
> of ‘__set_fixmap’
> ./arch/arm/include/asm/fixmap.h:55:6: note: expected ‘pgprot_t’ but
> argument is of type ‘long long unsigned int’
> make[1]: *** [arch/arm/kernel/patch.o] Error 1
> 
> Fixes Commit a5f4c561b ("ARM: 8415/1: early fixmap support for earlycon").
> 
> Annotate the page flags properly using __pgprot.

Acked-by: Stefan Agner <stefan@...er.ch>

--
Stefan

> 
> Cc: Stefan Agner <stefan@...er.ch>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Russell King <rmk+kernel@....linux.org.uk>
> Cc: stable@...r.kernel.org	# v4.3+
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  arch/arm/include/asm/fixmap.h |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h
> index 5c17d2d..8d48d5a 100644
> --- a/arch/arm/include/asm/fixmap.h
> +++ b/arch/arm/include/asm/fixmap.h
> @@ -39,13 +39,13 @@ static const enum fixed_addresses __end_of_fixed_addresses =
>  	__end_of_fixmap_region > __end_of_early_ioremap_region ?
>  	__end_of_fixmap_region : __end_of_early_ioremap_region;
>  
> -#define FIXMAP_PAGE_COMMON	(L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN |
> L_PTE_DIRTY)
> +#define FIXMAP_PAGE_COMMON	__pgprot(L_PTE_YOUNG | L_PTE_PRESENT |
> L_PTE_XN | L_PTE_DIRTY)
>  
> -#define FIXMAP_PAGE_NORMAL	(FIXMAP_PAGE_COMMON | L_PTE_MT_WRITEBACK)
> -#define FIXMAP_PAGE_RO		(FIXMAP_PAGE_NORMAL | L_PTE_RDONLY)
> +#define FIXMAP_PAGE_NORMAL	__pgprot(pgprot_val(FIXMAP_PAGE_COMMON) |
> L_PTE_MT_WRITEBACK)
> +#define FIXMAP_PAGE_RO		__pgprot(pgprot_val(FIXMAP_PAGE_NORMAL) | L_PTE_RDONLY)
>  
>  /* Used by set_fixmap_(io|nocache), both meant for mapping a device */
> -#define FIXMAP_PAGE_IO		(FIXMAP_PAGE_COMMON | L_PTE_MT_DEV_SHARED |
> L_PTE_SHARED)
> +#define FIXMAP_PAGE_IO		__pgprot(pgprot_val(FIXMAP_PAGE_COMMON) |
> L_PTE_MT_DEV_SHARED | L_PTE_SHARED)
>  #define FIXMAP_PAGE_NOCACHE	FIXMAP_PAGE_IO
>  
>  #define __early_set_fixmap	__set_fixmap