linux-kernel - [PATCH v2 0/3] mm/get_user_pages

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Message-ID: <1522962072-182137-1-git-send-email-mst@redhat.com>
Date:   Fri, 6 Apr 2018 00:03:48 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Huang Ying <ying.huang@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Thorsten Leemhuis <regressions@...mhuis.info>
Subject: [PATCH v2 0/3] mm/get_user_pages_fast fixes, cleanups

Turns out get_user_pages_fast and __get_user_pages_fast return different
values on error when given a single page: __get_user_pages_fast returns
0.  get_user_pages_fast returns either 0 or an error.

Callers of get_user_pages_fast expect an error so fix it up to return an
error consistently.

Stress the difference between get_user_pages_fast and __get_user_pages_fast
to make sure callers aren't confused.

Changes from v1:
	limit code changes to get_user_pages_fast.
	document __get_user_pages_fast
	fix a bug in caller

Michael S. Tsirkin (3):
  mm/gup_benchmark: handle gup failures
  gup: return -EFAULT on access_ok failure
  mm/gup: document return value

 arch/mips/mm/gup.c  | 2 ++
 arch/s390/mm/gup.c  | 2 ++
 arch/sh/mm/gup.c    | 2 ++
 arch/sparc/mm/gup.c | 4 ++++
 mm/gup.c            | 9 +++++++--
 mm/gup_benchmark.c  | 5 +++--
 mm/util.c           | 6 ++++--
 7 files changed, 24 insertions(+), 6 deletions(-)

-- 
MST