RISC-V: Move to generic spinlocks

Browse source

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.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Guo Ren <guoren@kernel.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

...

This commit is contained in:

Palmer Dabbelt 2022-03-16 16:07:34 -07:00

parent 205bf39a34

commit 4922a3ea01

No known key found for this signature in database

GPG key ID: 2E1319F35FBB1889

3 changed files with 10 additions and 45 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/riscv/include/asm/Kbuild

View file

44

arch/riscv/include/asm/spinlock.h

View file

9

arch/riscv/include/asm/spinlock_types.h

View file