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Subject: Re: [PATCH v35 1/5] mm: support to get hints of free page blocks
On Wed, Jul 11, 2018 at 07:00:37AM +0300, Michael S. Tsirkin wrote: > On Tue, Jul 10, 2018 at 10:33:08AM -0700, Linus Torvalds wrote: > > NAK. > > > > On Tue, Jul 10, 2018 at 2:56 AM Wei Wang <email@example.com> wrote: > > > > > > + > > > + buf_page = list_first_entry_or_null(pages, struct page, lru); > > > + if (!buf_page) > > > + return -EINVAL; > > > + buf = (__le64 *)page_address(buf_page); > > > > Stop this garbage. > > > > Why the hell would you pass in some crazy "liost of pages" that uses > > that lru list? > > > > That's just insane shit. > > > > Just pass in a an array to fill in. > > No idiotic games like this with > > odd list entries (what's the locking?) and crazy casting to > > > > So if you want an array of page addresses, pass that in as such. If > > you want to do it in a page, do it with > > > > u64 *array = page_address(page); > > int nr = PAGE_SIZE / sizeof(u64); > > > > and now you pass that array in to the thing. None of this completely > > insane crazy crap interfaces. > > Question was raised what to do if there are so many free > MAX_ORDER pages that their addresses don't fit in a single MAX_ORDER > page. Oh you answered already, I spoke too soon. Nevermind, pls ignore me.