linux-kernel - Re: [PATCH 2/2] efi: Fix warning of int-to-pointer-cast on x86 32-bit builds

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Message-ID: <20151027211113.GD8973@codeblueprint.co.uk>
Date:	Tue, 27 Oct 2015 21:11:13 +0000
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	linux-efi@...r.kernel.org, izumi.taku@...fujitsu.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 2/2] efi: Fix warning of int-to-pointer-cast on x86
 32-bit builds

On Fri, 23 Oct, at 11:48:17AM, Ard Biesheuvel wrote:
> From: Taku Izumi <izumi.taku@...fujitsu.com>
> 
> Commit 0f96a99dab36 ("efi: Add "efi_fake_mem" boot option")
> introduces the following warning message:
> 
>   drivers/firmware/efi/fake_mem.c:186:20: warning: cast to pointer
>   from integer of different size [-Wint-to-pointer-cast]
> 
> new_memmap_phy was defined as a u64 value and cast to void*, causing
> a int-to-pointer-cast warning on x86 32-bit builds.
> However, since the void* type is inappropriate for a physical
> address, the definition of struct efi_memory_map::phys_map has been
> changed to phys_addr_t in the previous patch, and so the cast can be
> dropped entirely.
> 
> This patch also changes the type of the "new_memmap_phy" variable
> from "u64" to "phys_addr_t" to align with the types of
> memblock_alloc() and struct efi_memory_map::phys_map.
> 
> Reported-by: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Taku Izumi <izumi.taku@...fujitsu.com>
> [ard.biesheuvel: removed void* cast, updated commit log]
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> ---
>  drivers/firmware/efi/fake_mem.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Matt Fleming <matt@...eblueprint.co.uk>
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