From: Heiko =?unknown-8bit?q?St=C3=BCbner?= <heiko@sntech.de>
To: openrisc@lists.librecores.org
Subject: [PATCH v4 5/7] RISC-V: Move to generic spinlocks
Date: Wed, 04 May 2022 14:02:44 +0200 [thread overview]
Message-ID: <3428595.iIbC2pHGDl@diego> (raw)
In-Reply-To: <20220430153626.30660-6-palmer@rivosinc.com>
Am Samstag, 30. April 2022, 17:36:24 CEST schrieb Palmer Dabbelt:
> From: Palmer Dabbelt <palmer@rivosinc.com>
>
> Our existing spinlocks aren't fair and replacing them has been on the
> TODO list for a long time. This moves to the recently-introduced ticket
> spinlocks, which are simple enough that they are likely to be correct
> and fast on the vast majority of extant implementations.
>
> This introduces a horrible hack that allows us to split out the spinlock
> conversion from the rwlock conversion. We have to do the spinlocks
> first because qrwlock needs fair spinlocks, but we don't want to pollute
> the asm-generic code to support the generic spinlocks without qrwlocks.
> Thus we pollute the RISC-V code, but just until the next commit as it's
> all going away.
>
> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
on riscv64+riscv32 qemu, beaglev and d1-nezha
Tested-by: Heiko Stuebner <heiko@sntech.de>
next prev parent reply other threads:[~2022-05-04 12:02 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-30 15:36 [OpenRISC] [PATCH v4 0/7] Generic Ticket Spinlocks Palmer Dabbelt
2022-04-30 15:36 ` [OpenRISC] [PATCH v4 1/7] asm-generic: ticket-lock: New generic ticket-based spinlock Palmer Dabbelt
2022-05-04 11:57 ` Heiko =?unknown-8bit?q?St=C3=BCbner?=
2022-05-05 3:30 ` Guo Ren
2022-04-30 15:36 ` [OpenRISC] [PATCH v4 2/7] asm-generic: qspinlock: Indicate the use of mixed-size atomics Palmer Dabbelt
2022-05-04 12:02 ` Heiko =?unknown-8bit?q?St=C3=BCbner?=
2022-05-05 11:05 ` Arnd Bergmann
2022-04-30 15:36 ` [OpenRISC] [PATCH v4 3/7] asm-generic: qrwlock: Document the spinlock fairness requirements Palmer Dabbelt
2022-04-30 15:36 ` [OpenRISC] [PATCH v4 4/7] openrisc: Move to ticket-spinlock Palmer Dabbelt
2022-04-30 15:36 ` [OpenRISC] [PATCH v4 5/7] RISC-V: Move to generic spinlocks Palmer Dabbelt
2022-05-04 12:02 ` Heiko =?unknown-8bit?q?St=C3=BCbner?= [this message]
2022-05-05 3:21 ` Guo Ren
2022-05-05 13:00 ` Conor.Dooley
2022-04-30 15:36 ` [OpenRISC] [PATCH v4 6/7] RISC-V: Move to queued RW locks Palmer Dabbelt
2022-05-04 12:03 ` Heiko =?unknown-8bit?q?St=C3=BCbner?=
2022-05-05 3:20 ` Guo Ren
2022-05-05 13:00 ` Conor.Dooley
2022-04-30 15:36 ` [OpenRISC] [PATCH v4 7/7] csky: Move to generic ticket-spinlock Palmer Dabbelt
2022-05-05 11:09 ` [PATCH v4 0/7] Generic Ticket Spinlocks Arnd Bergmann
2022-05-06 14:34 ` Palmer Dabbelt
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