linux-kernel - [PATCH v2 0/2] Fix issues with vmalloc flush flag

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Message-Id: <20190520233841.17194-1-rick.p.edgecombe@intel.com>
Date:   Mon, 20 May 2019 16:38:39 -0700
From:   Rick Edgecombe <rick.p.edgecombe@...el.com>
To:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        sparclinux@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, luto@...capital.net
Cc:     dave.hansen@...el.com, namit@...are.com, davem@...emloft.net,
        Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: [PATCH v2 0/2] Fix issues with vmalloc flush flag

These two patches address issues with the recently added
VM_FLUSH_RESET_PERMS vmalloc flag. It is now split into two patches, which
made sense to me, but can split it further if desired.

Patch 1 is the most critical and addresses an issue that could cause a
crash on x86.

Patch 2 is to try to reduce the work done in the free operation to push
it to allocation time where it would be more expected. This shouldn't be
a big issue most of the time, but I thought it was slightly better.

v2->v3:
 - Split into two patches

v1->v2:
 - Update commit message with more detail
 - Fix flush end range on !CONFIG_ARCH_HAS_SET_DIRECT_MAP case

Rick Edgecombe (2):
  vmalloc: Fix calculation of direct map addr range
  vmalloc: Remove work as from vfree path

 mm/vmalloc.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

-- 
2.20.1