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Date: Thu, 16 Jun 2016 16:11:21 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Richard Weinberger <richard@....at> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org, hannes@...xchg.org, mgorman@...hsingularity.net, n-horiguchi@...jp.nec.com, mhocko@...e.com, kirill.shutemov@...ux.intel.com, hughd@...gle.com, vbabka@...e.cz, adrian.hunter@...el.com, dedekind1@...il.com, hch@...radead.org, linux-fsdevel@...r.kernel.org, boris.brezillon@...e-electrons.com, maxime.ripard@...e-electrons.com, david@...ma-star.at, david@...morbit.com, alex@...tthing.co, sasha.levin@...cle.com, iamjoonsoo.kim@....com, rvaswani@...eaurora.org, tony.luck@...el.com, shailendra.capricorn@...il.com Subject: Re: [PATCH 1/3] mm: Don't blindly assign fallback_migrate_page() On Thu, 16 Jun 2016 23:26:13 +0200 Richard Weinberger <richard@....at> wrote: > While block oriented filesystems use buffer_migrate_page() > as page migration function other filesystems which don't > implement ->migratepage() will automatically get fallback_migrate_page() > assigned. fallback_migrate_page() is not as generic as is should > be. Page migration is filesystem specific and a one-fits-all function > is hard to achieve. UBIFS leaned this lection the hard way. > It uses various page flags and fallback_migrate_page() does not > handle these flags as UBIFS expected. > > To make sure that no further filesystem will get confused by > fallback_migrate_page() disable the automatic assignment and > allow filesystems to use this function explicitly if it is > really suitable. hm, is there really much point in doing this? I assume it doesn't actually affect any current filesystems? [2/3] is of course OK - please add it to the UBIFS tree.
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