Messages in this thread | | | Date | Tue, 10 Jan 2023 23:37:25 +0000 | From | Matthew Wilcox <> | Subject | Re: [PATCH 1/5] mm: compaction: Remove redundant VM_BUG_ON() in compact_zone() |
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On Tue, Jan 10, 2023 at 03:25:32PM -0800, Andrew Morton wrote: > On Tue, 10 Jan 2023 13:37:57 +0000 Matthew Wilcox <willy@infradead.org> wrote: > > > On Tue, Jan 10, 2023 at 09:36:18PM +0800, Baolin Wang wrote: > > > The compaction_suitable() will never return values other than COMPACT_SUCCESS, > > > COMPACT_SKIPPED and COMPACT_CONTINUE, so after validation of COMPACT_SUCCESS > > > and COMPACT_SKIPPED, we will never hit other unexpected case. Thus remove > > > the redundant VM_BUG_ON() validation for the return values of compaction_suitable(). > > > > I don't understand why we'd remove this check. > > Well, just from code inspection it serves no purpose. > > Such an assertion might be useful during early code development, but I > think we can consider compaction_suitable() to adequately debugged by > now?
What if compaction_suitable() is modified to return another value? This seems like a relatively innocuous check.
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