Messages in this thread Patch in this message | | | Date | Fri, 22 May 2015 17:29:20 +0200 | Subject | Re: [PATCH soc] ARM: use ARM_SINGLE_ARMV7M for ARMv7-M platforms | From | Maxime Coquelin <> |
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2015-05-22 16:50 GMT+02:00 Arnd Bergmann <arnd@arndb.de>: > [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
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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
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