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
Date: Fri, 28 Oct 2022 17:47:17 +0100 [thread overview]
Message-ID: <Y1wHlSE0S5QZ+QCI@shell.armlinux.org.uk> (raw)
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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next reply other threads:[~2022-10-28 16:48 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-28 16:47 Russell King (Oracle) [this message]
2022-10-28 16:47 ` [PATCH 1/5] ARM: findbit: document ARMv5 bit offset calculation Russell King (Oracle)
2022-10-28 17:05 ` Linus Torvalds
2022-10-28 17:45 ` Russell King (Oracle)
2022-10-28 18:37 ` Yury Norov
2022-10-28 19:42 ` Russell King (Oracle)
2022-10-28 19:01 ` Linus Torvalds
2022-10-28 19:10 ` Linus Torvalds
2022-10-28 19:46 ` Russell King (Oracle)
2022-10-28 20:26 ` Linus Torvalds
2022-10-28 16:47 ` [PATCH 2/5] ARM: findbit: provide more efficient ARMv7 implementation Russell King (Oracle)
2022-10-28 16:48 ` [PATCH 3/5] ARM: findbit: convert to macros Russell King (Oracle)
2022-10-28 16:48 ` [PATCH 4/5] ARM: findbit: operate by words Russell King (Oracle)
2022-10-28 16:48 ` [PATCH 5/5] ARM: findbit: add unwinder information Russell King (Oracle)
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