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Date:   Fri, 28 Oct 2022 17:47:17 +0100
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Yury Norov <yury.norov@gmail.com>
Cc:     Catalin Marinas <catalin.marinas@arm.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-arm-kernel@lists.infradead.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Will Deacon <will@kernel.org>
Subject: [PATCH 0/5] ARM: findbit assembly updates
Message-ID: <Y1wHlSE0S5QZ+QCI@shell.armlinux.org.uk>
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Sender: Russell King (Oracle) <linux@armlinux.org.uk>
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Hi,

This series updates the arm32 assembly versions of the findbit
operations:

- Document ARMv5 code that calculates the bit offset
- Provide an updated ARMv7 implementation using the rbit instruction
- Switch to use macros instead of duplicating mostly identical code
- Switch to using word loads rather than byte loads
- Add unwinder information for backtracing

I've had it sitting around in-use for some time, and no issues have
arisen. Tested also outside the kernel tree in userspace and results
are the same with the previous implementation.

Testing with the find_bit benchmark module shows that these operations
coded in assembly are faster than the generic versions (previously
posted), so I believe they're worth keeping.

 arch/arm/include/asm/assembler.h |   6 +
 arch/arm/lib/findbit.S           | 230 +++++++++++++++------------------------
 2 files changed, 94 insertions(+), 142 deletions(-)

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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