Re: [PATCH] riscv: enable GENERIC_FIND_FIRST_BIT
From: Jisheng Zhang <hidden>
Date: 2021-09-09 14:39:03
Also in:
lkml
On Thu, 9 Sep 2021 08:58:31 +0800 Kefeng Wang [off-list ref] wrote:
On 2021/9/8 23:04, Jisheng Zhang wrote:quoted
Hi Palmer, On Sun, 18 Jul 2021 00:14:23 +0800 Jisheng Zhang wrote:quoted
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? ThanksIt is enabled unconditionally by following commit commit dbbccfe505ef8fae804677abf0564c1e07479102 Author: Yury Norov [off-list ref] Date: Tue Aug 24 09:59:56 2021 +1000 arch: remove GENERIC_FIND_FIRST_BIT entirely
Aha, thanks for the information. After Yury's commit, this patch is useless now. thanks _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv