linux-kernel - [RESEND][PATCH 0/6] Constify struct page arguments

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Message-Id: <20210416231531.2521383-1-willy@infradead.org>
Date:   Sat, 17 Apr 2021 00:15:25 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: [RESEND][PATCH 0/6] Constify struct page arguments

[I'm told that patches 2-6 did not make it to the list; resending and
cc'ing lkml this time]

While working on various solutions to the 32-bit struct page size
regression, one of the problems I found was the networking stack expects
to be able to pass const struct page pointers around, and the mm doesn't
provide a lot of const-friendly functions to call.  The root tangle of
problems is that a lot of functions call VM_BUG_ON_PAGE(), which calls
dump_page(), which calls a lot of functions which don't take a const
struct page (but could be const).

I have other things I need to work on, but I offer these patches as a few
steps towards being able to make dump_page() take a const page pointer.

Matthew Wilcox (Oracle) (6):
  mm: Make __dump_page static
  mm/debug: Factor PagePoisoned out of __dump_page
  mm/page_owner: Constify dump_page_owner
  mm: Make compound_head const-preserving
  mm: Constify get_pfnblock_flags_mask and get_pfnblock_migratetype
  mm: Constify page_count and page_ref_count

 include/linux/mmdebug.h         |  3 +--
 include/linux/page-flags.h      | 10 +++++-----
 include/linux/page_owner.h      |  6 +++---
 include/linux/page_ref.h        |  4 ++--
 include/linux/pageblock-flags.h |  2 +-
 mm/debug.c                      | 25 +++++++------------------
 mm/page_alloc.c                 | 16 ++++++++--------
 mm/page_owner.c                 |  2 +-
 8 files changed, 28 insertions(+), 40 deletions(-)

-- 
2.30.2