Re: [PATCH v2 0/7] Optimize jump label implementation on ARM64

[Will Deacon]

On Sun, Oct 13, 2013 at 03:50:20PM +0100, Jiang Liu wrote:
> From: Jiang Liu <jiang.liu@xxxxxxxxxx>
> 
> This patchset tries to optimize arch specfic jump label implementation
> for ARM64 by dynamic kernel text patching.
> 
> To enable this feature, your toolchain must support "asm goto" extension
> and "%c" constraint extesion. Current GCC for AARCH64 doesn't support
> "%c", so you need a GCC patch similiar to this:
> http://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm.c?view=patch&r1=175293&r2=175565&pathrev=175565
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637

Right, but this is just for the ARM (AArch32) backend afaict. Are there any
plans for upstream GCC to support this constraint for AArch64?

Will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/