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

Will Deacon will at kernel.org
Wed Jan 15 05:24:10 PST 2020


On Wed, Jan 15, 2020 at 12:59:00PM +0000, Vladimir Murzin wrote:
> On 1/15/20 12:51 PM, Will Deacon wrote:
> > 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.
> 
> Would you mind if I send follow-up patch for BROKEN_GAS_INST conversion
> (it depends on as-inst)?

Sure, you can send whatever you like!

Will



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