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Message-ID: <597f1a12eb3962fcb569982659ee3196@agner.ch> Date: Tue, 02 Jun 2015 21:42:41 +0200 From: Stefan Agner <stefan@...er.ch> To: linux@....linux.org.uk Cc: arnd@...db.de, will.deacon@....com, u.kleine-koenig@...gutronix.de, manabian@...il.com, mcoquelin.stm32@...il.com, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] ARM: nommu: avoid deprecated source register on mov 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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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