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 3n3OZy9I tzFHEEvnInn893Uc2deAtDRLKrUAbNql+iceEs8Ev0HL+QD4I1/C/dSbxGQV0g3wIbcvt0+XcX1pBrKspoLx5cdk995yShAzrsxJuJI7eQwh+IuYLb+FZWuovjryte405PamMDS1tGML0T93mcj2PpKBpdTuNTGBhvbLAQxQfl2EU4QXl1dLMacJrULxqH76Yyt34VZeV+6bdp6ZZp1dKMv8sNsWGePX0vKcmTTsMcAErI5KQA53cG2sWZdvJwtX9+FxB76xfYoJex58KMGsfw5tz0esbbDOfBDcXv321knW6kcpnj3ge1qOZAMP+RdZf2/toCHkO7EIYgb50B3f/GaSVIM94X40hkBPF+1iImesfGLFuFfiWwXtxgg== 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 7/30/24 22:15, Catalin Marinas wrote: > Hi Pavel, > > On Thu, Jul 25, 2024 at 12:12:15PM +0800, Pavel Tikhomirov wrote: >> @@ -1308,12 +1319,23 @@ static bool update_checksum(struct kmemleak_object *object) >> { >> u32 old_csum = object->checksum; >> >> - if (WARN_ON_ONCE(object->flags & (OBJECT_PHYS | OBJECT_PERCPU))) >> + if (WARN_ON_ONCE(object->flags & OBJECT_PHYS)) >> return false; >> >> kasan_disable_current(); >> kcsan_disable_current(); >> - object->checksum = crc32(0, kasan_reset_tag((void *)object->pointer), object->size); >> + if (object->flags & OBJECT_PERCPU) { >> + unsigned int cpu; >> + >> + object->checksum = 0; >> + for_each_possible_cpu(cpu) { >> + void *ptr = per_cpu_ptr((void __percpu *)object->pointer, cpu); >> + >> + object->checksum ^= crc32(0, kasan_reset_tag((void *)ptr), object->size); >> + } > > Slight worry this may take too long for large-ish objects with a large > number of CPUs. But we can revisit if anyone complains. > >> + } else { >> + object->checksum = crc32(0, kasan_reset_tag((void *)object->pointer), object->size); >> + } >> kasan_enable_current(); >> kcsan_enable_current(); >> >> @@ -1365,6 +1387,64 @@ static int scan_should_stop(void) >> return 0; >> } >> >> +static void scan_pointer(struct kmemleak_object *scanned, >> + unsigned long pointer, unsigned int objflags) > > Nitpick: I'd have called this lookup_pointer or something like that. > When I first saw it, I tried to figure out why it doesn't have a size > argument but it became clear that it's not actually scanning/reading the > location at 'pointer' but simply looking the value up in various trees. > Up to you if you want to change the name to something else. The patch > looks good. Yes, I agree "scan_" is a bit too confusing. Let's try "pointer_update_refs", as it is more self-explanatory, and represents what the function does. The "lookup_pointer" seems like a function which should return a pointer, e.g. like "lookup_object" returns an object, but we can always switch to "lookup_pointer" if you like. I will send v2 with this change shortly. > > Reviewed-by: Catalin Marinas > > Thanks. > -- Best regards, Tikhomirov Pavel Senior Software Developer, Virtuozzo.