linux-kernel - Re: [PATCH 05/11] IB/hfi1: convert __mmu_int

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Message-ID: <20191004115057.GA2371@google.com>
Date:   Fri, 4 Oct 2019 04:50:57 -0700
From:   Michel Lespinasse <walken@...gle.com>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     akpm@...ux-foundation.org, peterz@...radead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 05/11] IB/hfi1: convert __mmu_int_rb to half closed
 intervals

On Thu, Oct 03, 2019 at 01:18:52PM -0700, Davidlohr Bueso wrote:
> diff --git a/drivers/infiniband/hw/hfi1/mmu_rb.c b/drivers/infiniband/hw/hfi1/mmu_rb.c
> index 14d2a90964c3..fb6382b2d44e 100644
> --- a/drivers/infiniband/hw/hfi1/mmu_rb.c
> +++ b/drivers/infiniband/hw/hfi1/mmu_rb.c
> @@ -47,7 +47,7 @@
>  #include <linux/list.h>
>  #include <linux/rculist.h>
>  #include <linux/mmu_notifier.h>
> -#include <linux/interval_tree_generic.h>
> +#include <linux/interval_tree_gen.h>
>  
>  #include "mmu_rb.h"
>  #include "trace.h"
> @@ -89,7 +89,7 @@ static unsigned long mmu_node_start(struct mmu_rb_node *node)
>  
>  static unsigned long mmu_node_last(struct mmu_rb_node *node)
>  {
> -	return PAGE_ALIGN(node->addr + node->len) - 1;
> +	return PAGE_ALIGN(node->addr + node->len);
>  }

May as well rename the function mmu_node_end(). I was worried if it
was used anywhere else, but it turned out it's only used when defining
the interval tree.

I would also suggest moving this function (as well as mmu_node_first)
right before its use, rather than just after, which would allow you to
also remove the function prototype a few lines earlier.

Looks good to me otherwise.

Reviewed-by: Michel Lespinasse <walken@...gle.com>

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.