linux-kernel - Re: [PATCH] infiniband: hw: hfi1: constify mmu_notifier

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Date:   Tue, 22 Nov 2016 19:43:03 -0500
From:   "ira.weiny" <ira.weiny@...el.com>
To:     Bhumika Goyal <bhumirks@...il.com>
Cc:     julia.lawall@...6.fr, mike.marciniszyn@...el.com,
        dennis.dalessandro@...el.com, dledford@...hat.com,
        sean.hefty@...el.com, hal.rosenstock@...il.com,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] infiniband: hw: hfi1: constify mmu_notifier_ops structure

On Sat, Nov 19, 2016 at 03:17:48PM +0530, Bhumika Goyal wrote:
> Declare the structure mmu_notifier_ops as const as it is only stored in
> the ops field of a mmu_notifier structure. The ops field is of type
> const struct mmu_notifier_ops *, so mmu_notifier_ops structures having
> this property can be declared as const.
> Done using coccinelle:
> @r1 disable optional_qualifier @
> identifier i;
> position p;
> @@
> static struct mmu_notifier_ops i@p = {...};
> 
> @ok1@
> identifier r1.i;
> position p;
> struct mmu_rb_handler handler;
> @@
> handler.mn.ops=&i@p
> 
> @bad@
> position p!={r1.p,ok1.p};
> identifier r1.i;
> @@
> i@p
> 
> @depends on !bad disable optional_qualifier@
> identifier r1.i;
> @@
> static
> +const
> struct mmu_notifier_ops i={...};
> 
> @depends on !bad disable optional_qualifier@
> identifier r1.i;
> @@
> +const
> struct mmu_notifier_ops i;
> 
> File size before:
>    text	   data	    bss	    dec	    hex	filename
>    3566	     72	     16	   3654	    e46
> drivers/infiniband/hw/hfi1/mmu_rb.o
> 
> File size after:
>    text	   data	    bss	    dec	    hex	filename
>    3658	      0	     16	   3674	    e5a
> drivers/infiniband/hw/hfi1/mmu_rb.o
> 
> Signed-off-by: Bhumika Goyal <bhumirks@...il.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> ---
>  drivers/infiniband/hw/hfi1/mmu_rb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/hw/hfi1/mmu_rb.c b/drivers/infiniband/hw/hfi1/mmu_rb.c
> index 7ad3089..ccbf52c 100644
> --- a/drivers/infiniband/hw/hfi1/mmu_rb.c
> +++ b/drivers/infiniband/hw/hfi1/mmu_rb.c
> @@ -81,7 +81,7 @@ static void do_remove(struct mmu_rb_handler *handler,
>  		      struct list_head *del_list);
>  static void handle_remove(struct work_struct *work);
>  
> -static struct mmu_notifier_ops mn_opts = {
> +static const struct mmu_notifier_ops mn_opts = {
>  	.invalidate_page = mmu_notifier_page,
>  	.invalidate_range_start = mmu_notifier_range_start,
>  };
> -- 
> 1.9.1
> 
> --
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