linux-kernel - Re: [PATCH 2/2] MIPS: enable GENERIC_FIND_FIRST

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Date:   Mon, 1 Mar 2021 15:49:08 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Yury Norov <yury.norov@...il.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Alexander Lobakin <alobakin@...me>,
        Alexey Klimov <aklimov@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH 2/2] MIPS: enable GENERIC_FIND_FIRST_BIT

On Thu, Feb 25, 2021 at 05:57:00AM -0800, Yury Norov wrote:
> From: Alexander Lobakin <alobakin@...me>
> 
> MIPS doesn't have architecture-optimized bitsearching functions,
> like find_{first,next}_bit() etc.
> It's absolutely harmless to enable GENERIC_FIND_FIRST_BIT as this
> functionality is not new at all and well-tested. It provides more
> optimized code and saves some .text memory (32 R2):
> 
> add/remove: 4/1 grow/shrink: 1/53 up/down: 216/-372 (-156)
> 
> Users of for_each_set_bit() like hotpath gic_handle_shared_int()
> will also benefit from this.
> 
> Suggested-by: Yury Norov <yury.norov@...il.com>
> Signed-off-by: Alexander Lobakin <alobakin@...me>
> Signed-off-by: Yury Norov <yury.norov@...il.com>
> ---
>  arch/mips/Kconfig | 1 +
>  1 file changed, 1 insertion(+)

applied to mips-next.

Thomas.

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