linux-kernel - Re: [Outreachy kernel] [PATCH 5/5] staging: lustre: osc_page.c: Use list_for_each_entry

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Message-ID: <CALrZqyPYyhFXQWJz924S2t3xKLV+fjqvoGyG-bVVucHHjAL2OA@mail.gmail.com>
Date:   Sun, 5 Mar 2017 23:21:31 +0530
From:   SIMRAN SINGHAL <singhalsimran0@...il.com>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     oleg.drokin@...el.com, andreas.dilger@...el.com,
        jsimmons@...radead.org, Greg KH <gregkh@...uxfoundation.org>,
        lustre-devel@...ts.lustre.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH 5/5] staging: lustre: osc_page.c: Use list_for_each_entry_safe

On Sun, Mar 5, 2017 at 11:18 PM, Julia Lawall <julia.lawall@...6.fr> wrote:
>
>
> On Sun, 5 Mar 2017, SIMRAN SINGHAL wrote:
>
>> On Sun, Mar 5, 2017 at 10:47 PM, Julia Lawall <julia.lawall@...6.fr> wrote:
>> > By the way, the above subject line is not correct.  Normally one does not
>> > put .c/.h in the subject line.  Indeed, there is not really any
>> > deterministic algorithm for choosing the subject line.  You need to run
>> > git log --oneline filename to see what others have done.
>>
>> So this would be fine Subject:-
>> staging: lustre: osc_page: Use list_for_each_entry_safe
>
> Looking at the result of git log --oneline, I would say:
>
> staging: lustre: osc:
>
> For example that it what is used by 86df598, which also only changes the
> file modified by this patch.
>
Actually, I can't use this as its already subject of one of a patch of
this patch
series.

> julia
>
>>
>> >
>> > julia
>> >
>> > On Sun, 5 Mar 2017, simran singhal wrote:
>> >
>> >> Doubly linked lists which are  iterated  using list_empty
>> >> and list_entry macros have been replaced with list_for_each_entry_safe
>> >> macro.
>> >> This makes the iteration simpler and more readable.
>> >>
>> >> This patch replaces the while loop containing list_empty and list_entry
>> >> with list_for_each_entry_safe.
>> >>
>> >> This was done with Coccinelle.
>> >>
>> >> @@
>> >> expression E1;
>> >> identifier I1, I2;
>> >> type T;
>> >> iterator name list_for_each_entry_safe;
>> >> @@
>> >>
>> >> T *I1;
>> >> + T *tmp;
>> >> ...
>> >> - while (list_empty(&E1) == 0)
>> >> + list_for_each_entry_safe (I1, tmp, &E1, I2)
>> >> {
>> >> ...when != T *I1;
>> >> - I1 = list_entry(E1.next, T, I2);
>> >> ...
>> >> }
>> >>
>> >> Signed-off-by: simran singhal <singhalsimran0@...il.com>
>> >> ---
>> >>  drivers/staging/lustre/lustre/osc/osc_page.c | 11 ++++-------
>> >>  1 file changed, 4 insertions(+), 7 deletions(-)
>> >>
>> >> diff --git a/drivers/staging/lustre/lustre/osc/osc_page.c b/drivers/staging/lustre/lustre/osc/osc_page.c
>> >> index ed8a0dc..e8b974f 100644
>> >> --- a/drivers/staging/lustre/lustre/osc/osc_page.c
>> >> +++ b/drivers/staging/lustre/lustre/osc/osc_page.c
>> >> @@ -542,6 +542,7 @@ long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
>> >>       struct cl_object *clobj = NULL;
>> >>       struct cl_page **pvec;
>> >>       struct osc_page *opg;
>> >> +     struct osc_page *tmp;
>> >>       int maxscan = 0;
>> >>       long count = 0;
>> >>       int index = 0;
>> >> @@ -572,7 +573,7 @@ long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
>> >>       if (force)
>> >>               cli->cl_lru_reclaim++;
>> >>       maxscan = min(target << 1, atomic_long_read(&cli->cl_lru_in_list));
>> >> -     while (!list_empty(&cli->cl_lru_list)) {
>> >> +     list_for_each_entry_safe(opg, tmp, &cli->cl_lru_list, ops_lru) {
>> >>               struct cl_page *page;
>> >>               bool will_free = false;
>> >>
>> >> @@ -582,8 +583,6 @@ long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
>> >>               if (--maxscan < 0)
>> >>                       break;
>> >>
>> >> -             opg = list_entry(cli->cl_lru_list.next, struct osc_page,
>> >> -                              ops_lru);
>> >>               page = opg->ops_cl.cpl_page;
>> >>               if (lru_page_busy(cli, page)) {
>> >>                       list_move_tail(&opg->ops_lru, &cli->cl_lru_list);
>> >> @@ -1043,6 +1042,7 @@ unsigned long osc_cache_shrink_scan(struct shrinker *sk,
>> >>  {
>> >>       struct client_obd *stop_anchor = NULL;
>> >>       struct client_obd *cli;
>> >> +     struct client_obd *tmp;
>> >>       struct lu_env *env;
>> >>       long shrank = 0;
>> >>       u16 refcheck;
>> >> @@ -1059,10 +1059,7 @@ unsigned long osc_cache_shrink_scan(struct shrinker *sk,
>> >>               return SHRINK_STOP;
>> >>
>> >>       spin_lock(&osc_shrink_lock);
>> >> -     while (!list_empty(&osc_shrink_list)) {
>> >> -             cli = list_entry(osc_shrink_list.next, struct client_obd,
>> >> -                              cl_shrink_list);
>> >> -
>> >> +     list_for_each_entry_safe(cli, tmp, &osc_shrink_list, cl_shrink_list) {
>> >>               if (!stop_anchor)
>> >>                       stop_anchor = cli;
>> >>               else if (cli == stop_anchor)
>> >> --
>> >> 2.7.4
>> >>
>> >> --
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>> >> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/1488733610-22289-6-git-send-email-singhalsimran0%40gmail.com.
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>> >>
>>