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SubjectRe: [PATCH 2/5] x86_64, -march=native: POPCNT support
On Mon, Jul 22, 2019 at 11:27:20PM +0300, Alexey Dobriyan wrote:
> Detect POPCNT instruction support and inline hweigth*() functions
> if it is supported by CPU.
>
> Detect POPCNT at boot time and conditionally refuse to boot.
>
> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
> ---
> arch/x86/include/asm/arch_hweight.h | 24 +++++++++++++++++++
> arch/x86/include/asm/segment.h | 1 +
> arch/x86/kernel/verify_cpu.S | 8 +++++++
> arch/x86/lib/Makefile | 5 +++-
> .../drm/i915/display/intel_display_power.c | 2 +-
> drivers/misc/sgi-gru/grumain.c | 2 +-
> fs/btrfs/tree-checker.c | 4 ++--
> include/linux/bitops.h | 2 ++
> lib/Makefile | 2 ++
> scripts/kconfig/cpuid.c | 7 ++++++
> scripts/march-native.sh | 2 ++
> 11 files changed, 54 insertions(+), 5 deletions(-)

*WHY* ?

AFAICT this just adds lines and complexity and wins aboslutely nothing.

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