linux-kernel - [PATCH RFC 0/2] mm/x86/pat: Fix two possible issues

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Date: Thu, 23 May 2024 18:37:43 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	peterx@...hat.com,
	Dan Williams <dan.j.williams@...el.com>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	Mike Rapoport <rppt@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Michal Hocko <mhocko@...e.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Borislav Petkov <bp@...en8.de>,
	x86@...nel.org
Subject: [PATCH RFC 0/2] mm/x86/pat: Fix two possible issues

I'm recently looking at the possibility of mapping PCIe large bars to use
huge mappings (just like thp or hugetlb).  Then I noticed these only when
reading the code.

I don't think I'm familiar enough with the whole PAT system, however I
figured I should post them out to collect some comments, hencing marking
this small series as RFC.

Please feel free to have a look at each of them; I've put more words in the
commit message than here, as the two issues are not related.  Any comments
are welcomed.

Thanks,

Peter Xu (2):
  mm/x86/pat: Only untrack the pfn range if unmap region
  mm/x86/pat: Do proper PAT bit shift for large mappings

 mm/huge_memory.c | 4 ++--
 mm/memory.c      | 5 ++---
 2 files changed, 4 insertions(+), 5 deletions(-)

-- 
2.45.0