On 1/16/19 3:29 AM, Eugeniy Paltsev wrote: > Even though we do enable AD bit in arc_init_IRQ() we need to do > it in early ASM code otherwise we may face unaligned data until > we reach arc_init_IRQ() because GCC starting from v8.1.0 actively > generates unaligned data as it assumes that: > * ARCv2 always has support of unaliged data > * This support is turned on in runtime > > Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@xxxxxxxxxxxx> > --- > arch/arc/kernel/head.S | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S > index 8b90d25a15cc..d5b7a572365a 100644 > --- a/arch/arc/kernel/head.S > +++ b/arch/arc/kernel/head.S > @@ -17,6 +17,9 @@ > #include <asm/entry.h> > #include <asm/arcregs.h> > #include <asm/cache.h> > +#ifdef CONFIG_ISA_ARCV2 > +#include <asm/irqflags-arcv2.h> > +#endif I presume there is no specific reason to include this conditionally. irqflags.h already includes the right version. > > .macro CPU_EARLY_SETUP > > @@ -47,6 +50,13 @@ > sr r5, [ARC_REG_DC_CTRL] > > 1: > + > +#ifdef CONFIG_ISA_ARCV2 > + ; Enable handling of unaligned access in the CPU as by default > + ; this HW feature is disabled while GCC starting from 8.1.0 > + ; unconditionally uses it for ARC HS cores. > + flag 1 << STATUS_AD_BIT > +#endif > .endm > > .section .init.text, "ax",@progbits > _______________________________________________ linux-snps-arc mailing list linux-snps-arc@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-snps-arc
