From: Yury Norov <yury.norov@xxxxxxxxx> Date: Mon, 10 May 2021 16:34:21 -0700 > In the 5.12 cycle we enabled the GENERIC_FIND_FIRST_BIT config option > for ARM64 and MIPS. It increased performance and shrunk .text size; and > so far I didn't receive any negative feedback on the change. > > https://lore.kernel.org/linux-arch/20210225135700.1381396-1-yury.norov@xxxxxxxxx/ > > I think it's time to make all architectures use find_{first,last}_bit() > unconditionally and remove the corresponding config option. > > This patch doesn't introduce functional changes for arc, arm64, mips, > s390 and x86 because they already enable GENERIC_FIND_FIRST_BIT. There > will be no changes for arm because it implements find_{first,last}_bit > in arch code. For other architectures I expect improvement both in > performance and .text size. > > It would be great if people with an access to real hardware would share > the output of bloat-o-meter and lib/find_bit_benchmark. > > Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx> > --- > arch/arc/Kconfig | 1 - > arch/arm64/Kconfig | 1 - > arch/mips/Kconfig | 1 - MIPS bit: Reviewed-by: Alexander Lobakin <alobakin@xxxxx> Tested-by: Alexander Lobakin <alobakin@xxxxx> > arch/s390/Kconfig | 1 - > arch/x86/Kconfig | 1 - > arch/x86/um/Kconfig | 1 - > include/asm-generic/bitops/find.h | 12 ------------ > lib/Kconfig | 3 --- > 8 files changed, 21 deletions(-) Thanks, Al
