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a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=yJojWOMRYYMA:10 a=GoEa3M9JfhUA:10 a=7CQSdrXTAAAA:8 a=cVbU9XGiCNqCj4wCCpcA:9 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODMwMDAzMiBTYWx0ZWRfX7t0ZTNmbI6WQ Be6MeJ6w8TiUNVj5D1AP7DMZpXd0MV32yYA+3N/z3H577qnWrePXdwTmM8ITvAnhxdJjVpujbKW c/APTeDOtEAvIf0bs9Tox0W0ZYelAvoC7uCMJa8UioV9R2Afz3fASbszRS8y5DolSH9unuDmag/ +Y1L34yVVouluzJ/0fhIVws8bBpJrKSVGjtHXbxfcMQ3xjQ7R3kV8HkykGBGgu1f+TKtgNw0euF w9laFd+k18hdvgmkB5kCXAAzBd0V/0s6sPvpBGVr77wHa6zrA8FIek1zgxC6JhnfECX7tbGp2HV Z2by0b7wkCiPuMiM+zD3DV7oVRj9/gXs5Qz/EGtk2/+3I/mFdtt8xzrqyXULG1xYzKvBx3uIGZH S1MaeHQb X-Proofpoint-GUID: YZHW1AUoPVCV-EAkKANxLDqUhvSCJhSb Catalin Marinas writes: > On Fri, Aug 29, 2025 at 01:07:32AM -0700, Ankur Arora wrote: >> diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h >> index f5801b0ba9e9..9b29abc212db 100644 >> --- a/arch/arm64/include/asm/barrier.h >> +++ b/arch/arm64/include/asm/barrier.h >> @@ -219,6 +219,28 @@ do { \ >> (typeof(*ptr))VAL; \ >> }) >> >> +extern bool arch_timer_evtstrm_available(void); > > In theory, this doesn't work if CONFIG_ARM_ARCH_TIMER is disabled, > though that's not the case for arm64. Maybe add a short comment that's > re-declared here to avoid include dependencies. Will add. Thanks Ankur >> + >> +#define smp_cond_load_relaxed_timewait(ptr, cond_expr, time_check_expr) \ >> +({ \ >> + typeof(ptr) __PTR = (ptr); \ >> + __unqual_scalar_typeof(*ptr) VAL; \ >> + bool __wfe = arch_timer_evtstrm_available(); \ >> + \ >> + for (;;) { \ >> + VAL = READ_ONCE(*__PTR); \ >> + if (cond_expr) \ >> + break; \ >> + if (time_check_expr) \ >> + break; \ >> + if (likely(__wfe)) \ >> + __cmpwait_relaxed(__PTR, VAL); \ >> + else \ >> + cpu_relax(); \ >> + } \ >> + (typeof(*ptr)) VAL; \ >> +}) >> + >> #include >> >> #endif /* __ASSEMBLY__ */ > > Reviewed-by: Catalin Marinas -- ankur