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| author | Mark Rutland <mark.rutland@arm.com> | 2021-11-26 12:59:23 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-12-13 10:56:09 +0100 |
| commit | 5fb6e8cf53b005d287d4c2d137a415ff7d025a81 (patch) | |
| tree | 5f57e4c9180cd6ee01add430b5c844c90457f24d /lib | |
| parent | Merge tag 'v5.16-rc5' into locking/core, to pick up fixes (diff) | |
| download | linux-5fb6e8cf53b005d287d4c2d137a415ff7d025a81.tar.xz linux-5fb6e8cf53b005d287d4c2d137a415ff7d025a81.zip | |
locking/atomic: atomic64: Remove unusable atomic ops
The generic atomic64 implementation provides:
* atomic64_and_return()
* atomic64_or_return()
* atomic64_xor_return()
... but none of these exist in the standard atomic64 API as described by
scripts/atomic/atomics.tbl, and none of these have prototypes exposed by
<asm-generic/atomic64.h>.
The lkp kernel test robot noted this results in warnings when building with
W=1:
lib/atomic64.c:82:5: warning: no previous prototype for 'generic_atomic64_and_return' [-Wmissing-prototypes]
lib/atomic64.c:82:5: warning: no previous prototype for 'generic_atomic64_or_return' [-Wmissing-prototypes]
lib/atomic64.c:82:5: warning: no previous prototype for 'generic_atomic64_xor_return' [-Wmissing-prototypes]
This appears to have been a thinko in commit:
28aa2bda2211f432 ("locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()")
... where we grouped add/sub separately from and/ox/xor, so that we could avoid
implementing _return forms for the latter group, but forgot to remove
ATOMIC64_OP_RETURN() for that group.
This doesn't cause any functional problem, but it's pointless to build code
which cannot be used. Remove the unusable code. This does not affect add/sub,
for which _return forms will still be built.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/20211126115923.41489-1-mark.rutland@arm.com
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/atomic64.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/lib/atomic64.c b/lib/atomic64.c index 3df653994177..caf895789a1e 100644 --- a/lib/atomic64.c +++ b/lib/atomic64.c @@ -118,7 +118,6 @@ ATOMIC64_OPS(sub, -=) #undef ATOMIC64_OPS #define ATOMIC64_OPS(op, c_op) \ ATOMIC64_OP(op, c_op) \ - ATOMIC64_OP_RETURN(op, c_op) \ ATOMIC64_FETCH_OP(op, c_op) ATOMIC64_OPS(and, &=) @@ -127,7 +126,6 @@ ATOMIC64_OPS(xor, ^=) #undef ATOMIC64_OPS #undef ATOMIC64_FETCH_OP -#undef ATOMIC64_OP_RETURN #undef ATOMIC64_OP s64 generic_atomic64_dec_if_positive(atomic64_t *v) |