[RFC PATCH v3 0/6] Deduplicating RISCV cmpxchg.h macros
Leonardo Bras
leobras at redhat.com
Tue Apr 4 09:37:35 PDT 2023
While studying riscv's cmpxchg.h file, I got really interested in
understanding how RISCV asm implemented the different versions of
{cmp,}xchg.
When I understood the pattern, it made sense for me to remove the
duplications and create macros to make it easier to understand what exactly
changes between the versions: Instruction sufixes & barriers.
I split those changes in 3 levels for each cmpxchg and xchg, resulting a
total of 6 patches. I did this so it becomes easier to review and remove
the last levels if desired, but I have no issue squashing them if it's
better.
Please provide comments.
Thanks!
Leo
Changes since v2:
- Fixed macros that depend on having a local variable with a magic name
- Previous cast to (long) is now only applied on 4-bytes cmpxchg
Changes since v1:
- Fixed patch 4/6 suffix from 'w.aqrl' to '.w.aqrl', to avoid build error
Leonardo Bras (6):
riscv/cmpxchg: Deduplicate cmpxchg() asm functions
riscv/cmpxchg: Deduplicate cmpxchg() macros
riscv/cmpxchg: Deduplicate arch_cmpxchg() macros
riscv/cmpxchg: Deduplicate xchg() asm functions
riscv/cmpxchg: Deduplicate xchg() macros
riscv/cmpxchg: Deduplicate arch_xchg() macros
arch/riscv/include/asm/cmpxchg.h | 319 +++++++------------------------
1 file changed, 67 insertions(+), 252 deletions(-)
--
2.40.0
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