Messages in this thread | | | Date | Wed, 8 Sep 2021 23:04:27 +0800 | From | Jisheng Zhang <> | Subject | Re: [PATCH] riscv: enable GENERIC_FIND_FIRST_BIT |
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Hi Palmer,
On Sun, 18 Jul 2021 00:14:23 +0800 Jisheng Zhang wrote:
> From: Jisheng Zhang <jszhang@kernel.org> > > riscv doesn't implement architecture-optimized bitsearching functions > such as find_first_{zero}_bit() etc. > > When GENERIC_FIND_FIRST_BIT=n, find_first_bit() is implemented with > find_next_bit() which is less efficient. Enable GENERIC_FIND_FIRST_BIT > for riscv to get more optimized find_first_bit() implementation, an > initial test(lib/find_bit_benchmark) shows find_first_bit() performance > is improved by nearly 32%.
It seems this patch is missed. Is it possible to pick it up for 2nd 5.15-rc1 PR?
Thanks
> > Signed-off-by: Jisheng Zhang <jszhang@kernel.org> > --- > arch/riscv/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index 8fcceb8eda07..7ebc54c5c245 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -47,6 +47,7 @@ config RISCV > select GENERIC_ATOMIC64 if !64BIT > select GENERIC_CLOCKEVENTS_BROADCAST if SMP > select GENERIC_EARLY_IOREMAP > + select GENERIC_FIND_FIRST_BIT > select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO > select GENERIC_IOREMAP > select GENERIC_IRQ_MULTI_HANDLER
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