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Date: Tue, 26 Feb 2019 12:57:37 +0100 From: Lars Persson <lars.persson@...s.com> To: Vlastimil Babka <vbabka@...e.cz>, Lars Persson <larper@...s.com>, <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org> CC: <linux-mips@...r.kernel.org> Subject: Re: [PATCH] mm: migrate: add missing flush_dcache_page for non-mapped page migrate On 2/26/19 11:07 AM, Vlastimil Babka wrote: > On 2/26/19 9:40 AM, Lars Persson wrote: >>> What about CC stable and a Fixes tag, would it be applicable here? >>> >> >> Yes this is candidate for stable so let's add: >> Cc: <stable@...r.kernel.org> >> >> I do not find a good candidate for a Fixes tag. > > How bout a version range where the bug needs to be fixed then? > The distinction between mapped and non-mapped old page was introduced in 2ebba6b7e1d9 ("mm: unmapped page migration avoid unmap+remap overhead") so at least it applies to stable 4.4+. Before that patch there was always a call to remove_migration_ptes() but I cannot conclude if those earlier versions actually will reach the flush_dcache_page call if the old page was unmapped.
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