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Message-ID: <ZX4+STzh5MFhVHrw@casper.infradead.org> Date: Sun, 17 Dec 2023 00:18:17 +0000 From: Matthew Wilcox <willy@...radead.org> To: Randy Dunlap <rdunlap@...radead.org> Cc: Kent Overstreet <kent.overstreet@...ux.dev>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, tglx@...utronix.de, x86@...nel.org, tj@...nel.org, peterz@...radead.org, mathieu.desnoyers@...icios.com, paulmck@...nel.org, keescook@...omium.org, dave.hansen@...ux.intel.com, mingo@...hat.com, will@...nel.org, longman@...hat.com, boqun.feng@...il.com, brauner@...nel.org Subject: Re: [PATCH 46/50] preempt.h: Kill dependency on list.h On Sat, Dec 16, 2023 at 04:04:43PM -0800, Randy Dunlap wrote: > > > On 12/16/23 14:35, Kent Overstreet wrote: > > On Sat, Dec 16, 2023 at 06:13:41AM +0000, Matthew Wilcox wrote: > >> On Fri, Dec 15, 2023 at 10:35:47PM -0500, Kent Overstreet wrote: > >>> - INIT_HLIST_NODE(¬ifier->link); > >>> + /* INIT_HLIST_NODE() open coded, to avoid dependency on list.h */ > >>> + notifier->link.next = NULL; > >>> + notifier->link.pprev = NULL; > >> > >> Arguably INIT_HLIST_NODE() belongs in types.h -- we already have > >> RCUREF_INIT() and ATOMIC_INIT() in there. > > > > I think I'd prefer to keep types.h as minimal as possible - as soon as > > we start putting non type stuff in there people won't know what the > > distinction is and it'll grow. > > > > preempt.h is a bit unusual too, normally we'd just split out a _types.h > > header there but it's not so easy to split up usefully. > > > > I don't feel like I have NAK power, but if I did, I would NAK > open coding of INIT_HLIST_HEAD() or anything like it. > I would expect some $maintainer to do likewise, but I could be > surprised. There is another solution here (although I prefer moving INIT_HLIST_HEAD into types.h). The preprocessor allows redefinitions as long as the two definitions match exactly. So you can copy INIT_HLIST_HEAD into preempt.h and if the definition ever changes, we'll notice.
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