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Subject[PATCHv2 00/16] atomics: API cleanups
Date
This series contains a few cleanups of the atomic API, fixing
inconsistencies between atomic_* and atomic64_*, and minimizing
repetition in arch code. This is nicer for arch code, and the improved
regularity will help when generating the atomic headers in future.

Since v1 [1]:
* Add missing inc_not_zero #define for x86_32
* Remove newly redundant test op definitions for riscv
* Remove atomic_inc_not_zero_hint()
* Make inc/dec ops optional

The bulk of the patches reorganise things so architectures consistently
provide <atomic>_fetch_add_unless(), with atomic_fetch_add_unless()
provided as a wrapper by core code. A generic fallback is provided for
<atomic>_fetch_add_unless(), based on <atomic>_read() and
<atomic>_try_cmpxchg().

Other patches in the series add common fallbacks for:

* atomic64_inc_not_zero()
* <atomic>_inc_and_test()
* <atomic>_dec_and_test()
* <atomic>_sub_and_test()
* <atomic>add_negative()
* <atomic>_*inc*()
* <atomic>_*dec*()

... as almost all architectures provide (near-)identical implementation
of these today. Where an architecture provides a non-trivial definition,
it is updated to provide a matching preprocessor symbol, and the
instrumented atomics are updated correspondingly.

The end result is a strongly negative diffstat, though <linux/atomic.h>
grows by a reasonable amount. We could halve this in future by
templating the various fallbacks for atomic{,64}_t with code generation.

I've pushed this out to my atomics/api-cleanup branch [2] on kernel.org.

Thanks,
Mark.

[1] https://lkml.kernel.org/r/20180523133533.1076-1-mark.rutland@arm.com
[2] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git atomics/api-cleanup

Mark Rutland (16):
atomics/treewide: s/__atomic_add_unless/atomic_fetch_add_unless/
atomics/treewide: remove redundant atomic_inc_not_zero() definitions
atomics/treewide: make atomic64_inc_not_zero() optional
atomics/treewide: make atomic_fetch_add_unless() optional
atomics: prepare for atomic64_fetch_add_unless()
atomics/generic: define atomic64_fetch_add_unless()
atomics/alpha: define atomic64_fetch_add_unless()
atomics/arc: define atomic64_fetch_add_unless()
atomics/arm: define atomic64_fetch_add_unless()
atomics/powerpc: define atomic64_fetch_add_unless()
atomics/riscv: define atomic64_fetch_add_unless()
atomics/treewide: make atomic64_fetch_add_unless() optional
atomics/treewide: make test ops optional
atomics/treewide: remove atomic_inc_not_zero_hint()
atomics/treewide: make unconditional inc/dec ops optional
atomics/treewide: make conditional inc/dec ops optional

arch/alpha/include/asm/atomic.h | 56 ++---
arch/arc/include/asm/atomic.h | 78 ++-----
arch/arm/include/asm/atomic.h | 55 ++---
arch/arm64/include/asm/atomic.h | 47 +---
arch/h8300/include/asm/atomic.h | 15 +-
arch/hexagon/include/asm/atomic.h | 18 +-
arch/ia64/include/asm/atomic.h | 81 -------
arch/m68k/include/asm/atomic.h | 24 +-
arch/mips/include/asm/atomic.h | 172 --------------
arch/openrisc/include/asm/atomic.h | 4 +-
arch/parisc/include/asm/atomic.h | 107 ---------
arch/powerpc/include/asm/atomic.h | 52 ++---
arch/riscv/include/asm/atomic.h | 149 +-----------
arch/s390/include/asm/atomic.h | 65 ------
arch/sh/include/asm/atomic.h | 35 ---
arch/sparc/include/asm/atomic_32.h | 24 +-
arch/sparc/include/asm/atomic_64.h | 65 +-----
arch/sparc/lib/atomic32.c | 4 +-
arch/x86/include/asm/atomic.h | 30 +--
arch/x86/include/asm/atomic64_32.h | 61 +----
arch/x86/include/asm/atomic64_64.h | 48 +---
arch/xtensa/include/asm/atomic.h | 98 --------
drivers/block/rbd.c | 2 +-
drivers/infiniband/core/rdma_core.c | 2 +-
fs/afs/rxrpc.c | 2 +-
include/asm-generic/atomic-instrumented.h | 69 +++++-
include/asm-generic/atomic.h | 33 ---
include/asm-generic/atomic64.h | 14 +-
include/linux/atomic.h | 371 +++++++++++++++++++++++++-----
kernel/bpf/syscall.c | 4 +-
lib/atomic64.c | 13 +-
net/atm/pppoatm.c | 2 +-
net/rxrpc/call_object.c | 2 +-
net/rxrpc/conn_object.c | 4 +-
net/rxrpc/local_object.c | 2 +-
net/rxrpc/peer_object.c | 2 +-
36 files changed, 499 insertions(+), 1311 deletions(-)

--
2.11.0

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