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@xxxxxxxxx> Closes: https://lore.kernel.org/oe-kbuild-all/202409251336.ToC0TvWB-lkp@xxxxxxxxx/ Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> Cc: Vineet Gupta <vgupta@xxxxxxxxxx> Cc: <linux-snps-arc@xxxxxxxxxxxxxxxxxxx> diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h index 58045c8983404..76f43db0890fc 100644 --- a/arch/arc/include/asm/cmpxchg.h +++ b/arch/arc/include/asm/cmpxchg.h @@ -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_); \
