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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=7CQSdrXTAAAA:8 a=hFSk6rJo8mGD2msrryoA:9 a=a-qgeE7W1pNrGK8U0ZQC:22 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-GUID: 1HqfSpdhE3XAiggRiQZ_1PSKK7jV4fz5 X-Proofpoint-ORIG-GUID: 1HqfSpdhE3XAiggRiQZ_1PSKK7jV4fz5 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA1MDEzNCBTYWx0ZWRfX5DGy7myqF14t eyoVIUKKbf4qOtrOK9q2Edo1aeNLn04bjL9Abk3ZdQoKdjl+28bdAxBeo8luQXCJFOyWuKpmovH ujgqW1lCk3E151b15/VmEHF4588ruebZdF81Y7moHifYhztv6Xn2jnZwqp6128TYTHRnDvQPqbl VsdvZxy8a3Y9O8TuahYE0HUTTonZ69H0nJMYshhbCTgcpmJzv8eFU2m+vM8Vp7I7cjOcUAZq3UO j50dlvm4DNWjTdUpp/p+Fxt4mYAc57yJbA4jmY4dSAPSIhU+lb5RPAFx381rEP28PE1A81idqRk PUep/L3y+RW7dOt8dEDr5/q5z67rXLHTtz1B1oFUYgkKqzo2sYzelU8F+g/z1W+WaXzM7vhTyHa T4ri3YpyDmZJMQr4Ias9lMY/yA+fWg== Arnd Bergmann writes: > On Wed, Nov 5, 2025, at 09:27, Ankur Arora wrote: >> Catalin Marinas writes: >>> On Mon, Nov 03, 2025 at 01:00:33PM -0800, Ankur Arora wrote: >>> With time_end_ns being passed to cpu_poll_relax(), we assume that this >>> is always the absolute time. Do we still need time_expr in this case? >>> It works for WFET as long as we can map this time_end_ns onto the >>> hardware CNTVCT. >>> >>> Alternatively, we could pass something like remaining_ns, though not >>> sure how smp_cond_load_relaxed_timeout() can decide to spin before >>> checking time_expr again (we probably went over this in the past two >>> years ;)). >> >> I'm sure it is in there somewhere :). >> This one?: https://lore.kernel.org/lkml/aJy414YufthzC1nv@arm.com/. >> Though the whole wait_policy thing confused the issue somewhat there. >> >> Though that problem exists for both remaining_ns and for time_end_ns >> with WFE. I think we are fine so long as SMP_TIMEOUT_POLL_COUNT is >> defined to be 1. > > We need to be careful with the definition of the time_expr() if > cpu_poll_relax requires the absolute time in CNTVCT domain. True. The absolute time assumes that CPU time and CNTVCT domain times are freely translatable, and won't drift. > We're probably fine here, but it feels like a bit of a layering > violation. I think passing relative time into it would be cleaner > because it avoids the ambiguity it I'll play around a little; see if we can pass the relative time and yet not depend on the conjoined value of SMP_TIMEOUT_POLL_COUNT. > but probably requires an extra > access to the timer register that is hopefully fast on arm64. > > I'm ok with either way. I'll keep the caller parameter to be remaining_ns. This way we can internally switch over to relative/absolute time if needed. >> For now, I think it makes sense to always pass the absolute deadline >> even if the caller uses remaining_ns. So: >> >> #define smp_cond_load_relaxed_timeout(ptr, cond_expr, time_expr, remaining_ns) \ >> ({ \ >> typeof(ptr) __PTR = (ptr); \ >> __unqual_scalar_typeof(*ptr) VAL; \ >> u32 __n = 0, __spin = SMP_TIMEOUT_POLL_COUNT; \ >> u64 __time_start_ns = (time_expr); \ >> s64 __time_end_ns = __time_start_ns + (remaining_ns); \ >> \ >> for (;;) { \ >> VAL = READ_ONCE(*__PTR); \ >> if (cond_expr) \ >> break; \ >> cpu_poll_relax(__PTR, VAL, __time_end_ns); \ > > This looks perfectly fine to me, thanks for the update! Thanks for the review comments! -- ankur