linux-kernel - Re: [PATCH 3/3] ARM: ixp4xx: move indirect I/O into common-pci.c

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Date:	Mon, 15 Feb 2016 08:07:52 +0100
From:	khalasa@...p.pl (Krzysztof Hałasa)
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Imre Kaloz <kaloz@...nwrt.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: ixp4xx: move indirect I/O into common-pci.c

Arnd Bergmann <arnd@...db.de> writes:

> The pointer comparison in is_pci_memory() confuses gcc, so it
> starts throwing bogus warnings about the use of possibly uninitialized
> variables:
>
> drivers/ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset':
> arch/arm/include/asm/io.h:101:2: error: 'px_is' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> drivers/crypto/ixp4xx_crypto.c: In function 'aead_perform':
> drivers/crypto/ixp4xx_crypto.c:1072:5: error: 'lastlen' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
> The code is that gets warned about is correct, and we should not warn
> about this. Moving the code into a .c file makes the object files
> smaller and avoids the warnings.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm/mach-ixp4xx/common-pci.c      | 98 ++++++++++++++++++++++++++++++++++
>  arch/arm/mach-ixp4xx/include/mach/io.h | 95 +++-----------------------------
>  2 files changed, 104 insertions(+), 89 deletions(-)

Acked-by: Krzysztof Hałasa <khalasa@...p.pl>
-- 
Krzysztof Halasa

Industrial Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland