[PATCH v2 0/2] arm64: Simplify gas LSE support detection

Will Deacon will at kernel.org
Wed Jan 15 04:51:10 PST 2020


On Wed, Jan 15, 2020 at 12:49:17PM +0000, Vladimir Murzin wrote:
> On 1/15/20 11:30 AM, Catalin Marinas wrote:
> > Version two of the patch series moving the LSE assembler support
> > detection from Makefile to Kconfig.
> > 
> > Changes since v1 [1]:
> > 
> > - Re-introduce the Makefile warning if the .config contains
> >   CONFIG_ARM64_USE_LSE_ATOMICS but the assembler does not support the
> >   feature, disabling CONFIG_ARM64_LSE_ATOMICS.
> > 
> > [1] http://lkml.kernel.org/r/20200109174948.48211-1-catalin.marinas@arm.com
> > 
> > Catalin Marinas (2):
> >   kbuild: Add support for 'as-instr' to be used in Kconfig files
> >   arm64: Move the LSE gas support detection to Kconfig
> > 
> >  arch/arm64/Kconfig                    |  5 +++++
> >  arch/arm64/Makefile                   | 11 ++++-------
> >  arch/arm64/include/asm/atomic_ll_sc.h |  2 +-
> >  arch/arm64/include/asm/lse.h          |  6 +++---
> >  arch/arm64/kernel/cpufeature.c        |  4 ++--
> >  scripts/Kconfig.include               |  4 ++++
> >  6 files changed, 19 insertions(+), 13 deletions(-)
> > 
> > 
> 
> with
> 
> aarch64-linux-gnu-gcc (crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC 4.9-2014.09) 4.9.2 20140904 (prerelease)
> 
> I see (among other warnings)
> 
>     arch/arm64/Makefile:35: LSE atomics not supported by binutils
> 
> while with
> 
> aarch64-none-linux-gnu-gcc (GNU Toolchain for the A-profile Architecture 9.2-2019.12 (arm-9.10)) 9.2.1 20191025
> 
> warning disappears.
> 
> 
> FWIW:
> 
> Reviewed-by: Vladimir Murzin <vladimir.murzin at arm.com>
> Tested-by: Vladimir Murzin <vladimir.murzin at arm.com>

Cheers, I've queued the patches with your tags.

Will



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