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 <[email protected]> > --- > 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.
