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ARC: build: Use __force to suppress per-CPU cmpxchg warnings

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[ Upstream commit 1e8af9f04346ecc0bccf0c53b728fc8eb3490a28 ]

Currently, the cast of the first argument to cmpxchg_emu_u8() drops the
__percpu address-space designator, which results in sparse complaints
when applying cmpxchg() to per-CPU variables in ARC.  Therefore, use
__force to suppress these complaints, given that this does not pertain
to cmpxchg() semantics, which are plently well-defined on variables in
general, whether per-CPU or otherwise.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409251336.ToC0TvWB-lkp@intel.com/
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: <linux-snps-arc@lists.infradead.org>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul E. McKenney
2024-10-09 10:55:13 -07:00
committed by Greg Kroah-Hartman
parent 600340ed71
commit 4be7ad1f9c
1 changed files with 1 additions and 1 deletions
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arch/arc/include/asm/cmpxchg.h
+1 -1
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@@ -48,7 +48,7 @@
\
switch(sizeof((_p_))) { \
case 1: \
_prev_ = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
_prev_ = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *__force)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
break; \
case 4: \
_prev_ = __cmpxchg(_p_, _o_, _n_); \