Re: [PATCH v2 0/5] lib: rework bitmap_parselist and tests

[Yury Norov <yury.norov@gmail.com>]

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On Wed, Feb 20, 2019 at 11:36:59AM +0300, Yury Norov wrote:
> bitmap_parselist has been evolved from a pretty simple idea for long and
> now lacks for refactoring. It is not structured, has nested loops and a
> set of opaque-named variables. All this leads to extremely hard
> understanding of the code. Once during the optimization of it I missed a
> scenario which leads to kernel hangup. Tetsuo Handa spotted this and found
> it simpler to rewrite the code instead fixing it. (Though, that attempt
> had some flaws.)
> https://lkml.org/lkml/2018/4/1/93 
> 
> Things are more complicated than they may be because bitmap_parselist()
> is part of user interface, and its behavior should not change.
> 
> In this patchset 
>  - __bitmap_parselist() is reworked (patches 2 and 3);
>  - time measurement in test_bitmap_parselist switched to ktime_get
>    (patch 4);
>  - new tests introduced (patch 5), and
>  - bitmap_parselist_user() testing enabled with the same testset as
>    bitmap_parselist() (patch 6).
> 
> Patch 1 is a fix and may be applied separately.
> 
> V1: https://lkml.org/lkml/2018/12/23/50
> v2: - use PTR_ERR() and ERR_PTR() where appropriate;
>     - fix parser logic (last byte of string handling);
>     - tests for bitmap_parselist_user() in patch 5.
> 
> Yury Norov (4):
>   bitmap_parselist: don't calculate length of the input string
>   bitmap_parselist: move non-parser logic to helpers
>   bitmap_parselist: rework input string parser
>   lib/test_bitmap: switch test_bitmap_parselist to ktime_get()
>   lib/test_bitmap: add testcases for bitmap_parselist
>   lib/test_bitmap: add tests for bitmap_parselist_user
> 
>  lib/bitmap.c      | 293 ++++++++++++++++++++++++++++++----------------
>  lib/test_bitmap.c |  67 +++++++++--
>  2 files changed, 245 insertions(+), 115 deletions(-)
> 
> -- 
> 2.17.1