linux-kernel - Re: [Outreachy kernel] [PATCH 2/5] staging: lustre: ptlrpc: Use list_for_each_entry

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Date:   Sun, 5 Mar 2017 23:12:05 +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 2/5] staging: lustre: ptlrpc: Use list_for_each_entry_safe

On Sun, Mar 5, 2017 at 11:09 PM, Julia Lawall <julia.lawall@...6.fr> wrote:
>
>
> 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/ptlrpc/sec_gc.c | 5 ++---
>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/staging/lustre/lustre/ptlrpc/sec_gc.c b/drivers/staging/lustre/lustre/ptlrpc/sec_gc.c
>> index 8ffd000..fe1c0af 100644
>> --- a/drivers/staging/lustre/lustre/ptlrpc/sec_gc.c
>> +++ b/drivers/staging/lustre/lustre/ptlrpc/sec_gc.c
>> @@ -98,12 +98,11 @@ void sptlrpc_gc_del_sec(struct ptlrpc_sec *sec)
>>  static void sec_process_ctx_list(void)
>>  {
>>       struct ptlrpc_cli_ctx *ctx;
>> +     struct ptlrpc_cli_ctx *tmp;
>
> Another improvement would be to define both variables at once:
>
> T *I1
> + , *tmp
>   ;
>
This is particulary for this patch or for all the patches of this patch-series.

> julia
>
>>
>>       spin_lock(&sec_gc_ctx_list_lock);
>>
>> -     while (!list_empty(&sec_gc_ctx_list)) {
>> -             ctx = list_entry(sec_gc_ctx_list.next,
>> -                              struct ptlrpc_cli_ctx, cc_gc_chain);
>> +     list_for_each_entry_safe(ctx, tmp, &sec_gc_ctx_list, cc_gc_chain) {
>>               list_del_init(&ctx->cc_gc_chain);
>>               spin_unlock(&sec_gc_ctx_list_lock);
>>
>> --
>> 2.7.4
>>
>> --
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>>