MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Date: Tue, 02 Jun 2015 21:42:41 +0200
From: Stefan Agner <stefan@agner.ch>
To: linux@arm.linux.org.uk
Cc: arnd@arndb.de, will.deacon@arm.com, u.kleine-koenig@pengutronix.de,
        manabian@gmail.com, mcoquelin.stm32@gmail.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] ARM: nommu: avoid deprecated source register on mov
In-Reply-To: <1432337148-9894-1-git-send-email-stefan@agner.ch>
References: <1432337148-9894-1-git-send-email-stefan@agner.ch>
Message-ID: <597f1a12eb3962fcb569982659ee3196@agner.ch>
User-Agent: Roundcube Webmail/1.1.0
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1073
Lines: 26

On 2015-05-23 01:25, Stefan Agner wrote:
> In Thumb2 mode, the stack register r13 is deprecated if the
> destination register is the program counter (r15). Similar to
> head.S, head-nommu.S uses r13 to store the return address used
> after configuring the CPU's CP15 register. However, since we do
> not enable a MMU, there will be no address switch and it is
> possible to use branch with link instruction to call
> __after_proc_init.
> 
> Avoid using r13 completely by using bl to call __after_proc_init
> and get rid of __secondary_switched.
> 
> Beside removing unnecessary complexity, this also fixes a
> compiler warning when compiling a !MMU kernel:
> Warning: Use of r13 as a source register is deprecated when r15
> is the destination register.

Submitted this patch to the patch tracking system, ID 8383/1.

--
Stefan
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/