From mboxrd@z Thu Jan 1 00:00:00 1970 From: mcoquelin.stm32@gmail.com (Maxime Coquelin) Date: Fri, 22 May 2015 17:29:20 +0200 Subject: [PATCH soc] ARM: use ARM_SINGLE_ARMV7M for ARMv7-M platforms In-Reply-To: <15864413.ed8EFg1NLl@wuerfel> References: <1432161344-1930-1-git-send-email-stefan@agner.ch> <15864413.ed8EFg1NLl@wuerfel> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 2015-05-22 16:50 GMT+02:00 Arnd Bergmann : > [one small request as I have four armv7-m folks on Cc already: > could one of you try to fix the warning that I get with every > single build: "/git/arm-soc/arch/arm/kernel/head-nommu.S: Assembler > messages: /git/arm-soc/arch/arm/kernel/head-nommu.S:167: Warning: > Use of r13 as a source register is deprecated when r15 is the > destination register."] Moving r13 to r12 and returning r12 seems to do the job (see below). But I don't know if there is a more elegant way, and if it is also valid for other architectures than armv7-m. I can propose a patch if someone can confirm it is valid. Regards, Maxime ------------------------------------------------------------------------------------------------------------- diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index aebfbf7..e84bdad 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -164,7 +164,8 @@ __after_proc_init: #endif mcr p15, 0, r0, c1, c0, 0 @ write control reg #endif /* CONFIG_CPU_CP15 */ - ret r13 + mov r12, r13 + ret r12 ENDPROC(__after_proc_init) .ltorg