linux-kernel - [PATCH 0/6] lib/scatterlist: Small SGL tidy

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Date:   Wed,  7 Mar 2018 12:47:06 +0000
From:   Tvrtko Ursulin <tursulin@...ulin.net>
To:     linux-kernel@...r.kernel.org
Cc:     Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Bart Van Assche <bart.vanassche@....com>,
        Hannes Reinecke <hare@...e.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 0/6] lib/scatterlist: Small SGL tidy

From: Tvrtko Ursulin <tvrtko.ursulin@...el.com>

I spotted a few small issues in the recent added SGL code so am sending some
patches to tidy this.

My motivation was looking at sgl_alloc_order to potentially use from the i915
driver, with a small addition to support fall-back to smaller order allocation
if so was requested.

But then I realized scatterlist table allocated with sgl_alloc_order is not
compatible with being put into the sg_table container due different allocator
being used.

If it had used the standard chained scatterlist allocation, it would benefit
from less memory pressure for small-order large length allocations (in other
words large nent - as it stands it can request really large kmalloc allocations
for those cases), but to convert it to use that looks to would require some
refactoring of the SGL API users. So I wasn't sure how feasible would that be.

There were some other unclear bits to me in the SGL API, like why so much API
some of which is unused, so I tried to trim that as well.

So don't know - comments are welcome.

Tvrtko Ursulin (6):
  lib/scatterlist: Tidy types and fix overflow checking in
    sgl_alloc_order
  lib/scatterlist: Skip requesting zeroed allocations in sgl_alloc_order
  lib/scatterlist: Do not leak pages when high-order allocation fails
  lib/scatterlist: Unexport some trivial wrappers
  lib/scatterlist: Drop unused sgl_free_order
  lib/scatterlist: Drop order argument from sgl_free_n_order

 drivers/target/target_core_transport.c |  2 +-
 include/linux/scatterlist.h            | 36 +++++++++++---
 lib/scatterlist.c                      | 91 +++++++++++-----------------------
 3 files changed, 57 insertions(+), 72 deletions(-)

---
Cc: Bart Van Assche <bart.vanassche@....com>
Cc: Hannes Reinecke <hare@...e.com>
Cc: Johannes Thumshirn <jthumshirn@...e.de>
Cc: Jens Axboe <axboe@...nel.dk>

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2.14.1