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 Xqq6etHr mDijXOofZT2oIipg9x/lbUdIHl1eFszDg72pVZVpYK/1ac1jQ1M+scafzzvKr+aUoM8V/odH6L8DFgfzZpbRHoHMDv/GTFS2EOMh0E8guyxpBAvbk0L2Cjd+onQy/z96LMFPsZKfOVV5QEepCik9rmUhzWiKdtPrM19NBwWAmiUi5wwtKsr8fZzD3LCsuZZKWgtP4TS+kf9puz0TZCU49s84Py3SgosDhfYJmiNNQODqvbZO1jsvhc/CW//eN1JD2J6Scj7FzydDgtpHarTGwFS1I3wRJbNJLDTIXrmb8/Z9a4S6REV4SjWw0UeulLtaiuw9ctddL3G1QnTPIdALKFo8ksFJ77ExJYUHfkc5Tw43IrzsY5p+at9MQpxbi0yMtPPIJZQT82AqhfXsK8yUY9SR6o0aPCGBOor64mYdR9vkiGGn7O1oiCwJQy7RmaCyM+A/dUcWwxcYoa7GsnLGQRuaMR1hmrGblfdB2cXAZRpfXPiM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat Jan 17, 2026 at 3:39 PM GMT, Boqun Feng wrote: > On Sat, Jan 17, 2026 at 10:05:18PM +0800, Boqun Feng wrote: >> On Sat, Jan 17, 2026 at 01:29:25PM +0000, Alice Ryhl wrote: >> > On Sat, Jan 17, 2026 at 09:11:49PM +0800, Boqun Feng wrote: >> > > In Rcu + RcuOld design, RcuBox is just a Box >> > > because these two pointer types handle reclaim + accesses. >> >=20 >> > How would that work? Dropping my RcuBox<_> must use kfree_rcu() or >> > synchronize_rcu() or it is unsound. So it can't just be a Box. >> >=20 >>=20 >> RcuOld will call synchronize_rcu() before dropping >> `P`. And I think we can have an asynchronous drop pointer type like >> `RcuOld` that requires `P` is a type like `Box`, > > One blocker on that is Drop impls cannot be specialized. We probably > need a different pointer type like RcuOldAsync... I won't be too worried on this apsect, you could just branch on a const in = the drop function. Alternatively, we can have a method like this impl RcuOld> { fn drop_async(self) { // do call_rcu } } Best, Gary