linux-kernel - [PATCH 0/2 v2] remove PF_MEMALLOC

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Message-ID: <20240902095203.1559361-1-mhocko@kernel.org>
Date: Mon,  2 Sep 2024 11:51:48 +0200
From: Michal Hocko <mhocko@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Hellwig <hch@....de>,
	Yafang Shao <laoar.shao@...il.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	jack@...e.cz,
	Vlastimil Babka <vbabka@...e.cz>,
	Dave Chinner <dchinner@...hat.com>,
	Christian Brauner <brauner@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-bcachefs@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/2 v2] remove PF_MEMALLOC_NORECLAIM

The previous version has been posted in [1]. Based on the review feedback
I have sent v2 of patches in the same threat but it seems that the
review has mostly settled on these patches. There is still an open
discussion on whether having a NORECLAIM allocator semantic (compare to
atomic) is worthwhile or how to deal with broken GFP_NOFAIL users but
those are not really relevant to this particular patchset as it 1)
doesn't aim to implement either of the two and 2) it aims at spreading
PF_MEMALLOC_NORECLAIM use while it doesn't have a properly defined
semantic now that it is not widely used and much harder to fix.

I have collected Reviewed-bys and reposting here. These patches are
touching bcachefs, VFS and core MM so I am not sure which tree to merge
this through but I guess going through Andrew makes the most sense.

Changes since v1;
- compile fixes
- rather than dropping PF_MEMALLOC_NORECLAIM alone reverted eab0af905bfc
  ("mm: introduce PF_MEMALLOC_NORECLAIM, PF_MEMALLOC_NOWARN") suggested
  by Matthew.