Messages in this thread | | | Subject | Re: [PATCH] ARM: alignment: Use is_wide_instruction() to check wide instruction | From | Yingjoe Chen <> | Date | Thu, 7 May 2015 15:03:51 +0800 |
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On Fri, 2015-04-10 at 22:05 +0800, Yingjoe Chen wrote: > I first notice the comment is incorrect, then I realize there's another > macro which do exactly the same thing. > Tested with hand written userspace program with a few wide instructions > to make sure this still work as expect. > > 8<------------------------------------------------- > do_alignment() is using locally added IS_T32() macro to check if an > instruction is a Thumb-2 32 bit instruction. The macro > is_wide_instruction() is doing the same thing, with slightly faster > implementation. > Change to use is_wide_instruction() in do_alignment() and remove > IS_T32(). >
Hi Russell,
Any suggestion about this patch? Should I put this into your patch system?
Joe.C
> Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com> > --- > arch/arm/mm/alignment.c | 6 +----- > 1 file changed, 1 insertion(+), 5 deletions(-) > > diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c > index 2c0c541..f8e82f5 100644 > --- a/arch/arm/mm/alignment.c > +++ b/arch/arm/mm/alignment.c > @@ -71,10 +71,6 @@ > > #define BAD_INSTR 0xdeadc0de > > -/* Thumb-2 32 bit format per ARMv7 DDI0406A A6.3, either f800h,e800h,f800h */ > -#define IS_T32(hi16) \ > - (((hi16) & 0xe000) == 0xe000 && ((hi16) & 0x1800)) > - > static unsigned long ai_user; > static unsigned long ai_sys; > static void *ai_sys_last_pc; > @@ -770,7 +766,7 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs) > tinstr = __mem_to_opcode_thumb16(tinstr); > if (!fault) { > if (cpu_architecture() >= CPU_ARCH_ARMv7 && > - IS_T32(tinstr)) { > + is_wide_instruction(tinstr)) { > /* Thumb-2 32-bit */ > u16 tinst2 = 0; > fault = probe_kernel_address(ptr + 1, tinst2);
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