| Message ID | 1480423205-48436-8-git-send-email-vladimir.murzin@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index ad325a8..6da8b04 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -84,6 +84,11 @@ endif obj-$(CONFIG_PARAVIRT) += paravirt.o head-y := head$(MMUEXT).o +ifeq ($(CONFIG_CPU_V7M),y) +AFLAGS_head-nommu.o :=-Wa,-march=armv7-m +else +AFLAGS_head-nommu.o :=-Wa,-march=armv7-a +endif obj-$(CONFIG_DEBUG_LL) += debug.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
While building for pre-ARMv7 CPUs with ARM_MPU enabled following error shows up: AS arch/arm/kernel/head-nommu.o arch/arm/kernel/head-nommu.S: Assembler messages: arch/arm/kernel/head-nommu.S:223: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:231: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:235: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:244: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:248: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:258: Error: selected processor does not support ARM mode `isb' arch/arm/kernel/head-nommu.S:265: Error: selected processor does not support ARM mode `isb' make[1]: *** [arch/arm/kernel/head-nommu.o] Error 1 MPU setup code is available for ARMv7 only, but head-nommu.S is generic, so build head-nommu.S with -march=armv7-a (and armv7-m for M-calss to avoid "Conflicting architecture profiles M/A" link time) flag; in case pre-ARMv7 it detects there there is no MPU is avaliable, so it will never reach those instructions. Cc: Russell King <linux@armlinux.org.uk> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> --- arch/arm/kernel/Makefile | 5 +++++ 1 file changed, 5 insertions(+)