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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/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

_______________________________________________
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WARNING: multiple messages have this Message-ID (diff)
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/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

             reply	other threads:[~2022-10-28 16:48 UTC|newest]

Thread overview: 28+ 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 0/5] ARM: findbit assembly updates Russell King (Oracle)
2022-10-28 16:47 ` [PATCH 1/5] ARM: findbit: document ARMv5 bit offset calculation Russell King (Oracle)
2022-10-28 16:47   ` Russell King (Oracle)
2022-10-28 17:05   ` Linus Torvalds
2022-10-28 17:05     ` Linus Torvalds
2022-10-28 17:45     ` Russell King (Oracle)
2022-10-28 17:45       ` Russell King (Oracle)
2022-10-28 18:37       ` Yury Norov
2022-10-28 18:37         ` Yury Norov
2022-10-28 19:42         ` Russell King (Oracle)
2022-10-28 19:42           ` Russell King (Oracle)
2022-10-28 19:01       ` Linus Torvalds
2022-10-28 19:01         ` Linus Torvalds
2022-10-28 19:10         ` Linus Torvalds
2022-10-28 19:10           ` Linus Torvalds
2022-10-28 19:46         ` Russell King (Oracle)
2022-10-28 19:46           ` Russell King (Oracle)
2022-10-28 20:26           ` Linus Torvalds
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 16:47   ` Russell King (Oracle)
2022-10-28 16:48 ` [PATCH 3/5] ARM: findbit: convert to macros Russell King (Oracle)
2022-10-28 16:48   ` Russell King (Oracle)
2022-10-28 16:48 ` [PATCH 4/5] ARM: findbit: operate by words Russell King (Oracle)
2022-10-28 16:48   ` Russell King (Oracle)
2022-10-28 16:48 ` [PATCH 5/5] ARM: findbit: add unwinder information Russell King (Oracle)
2022-10-28 16:48   ` Russell King (Oracle)

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