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From: Minchan Kim <minchan@kernel.org>
To: Joonsoo Kim <js1304@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/5] mm, highmem: remove useless pool_lock
Date: Mon, 29 Oct 2012 10:52:59 +0900	[thread overview]
Message-ID: <20121029015259.GG15767@bbox> (raw)
In-Reply-To: <1351451576-2611-3-git-send-email-js1304@gmail.com>

On Mon, Oct 29, 2012 at 04:12:53AM +0900, Joonsoo Kim wrote:
> The pool_lock protects the page_address_pool from concurrent access.
> But, access to the page_address_pool is already protected by kmap_lock.
> So remove it.
> 
> Signed-off-by: Joonsoo Kim <js1304@gmail.com>
Reviewed-by: Minchan Kin <minchan@kernel.org>

Looks good to me.
Just a nitpick.

Please write comment about locking rule like below.

> 
> diff --git a/mm/highmem.c b/mm/highmem.c
> index b3b3d68..017bad1 100644
> --- a/mm/highmem.c
> +++ b/mm/highmem.c
> @@ -328,7 +328,6 @@ struct page_address_map {
>   * page_address_map freelist, allocated from page_address_maps.
>   */

/* page_address_pool is protected by kmap_lock */

>  static struct list_head page_address_pool;	/* freelist */
> -static spinlock_t pool_lock;			/* protects page_address_pool */
>  

-- 
Kind regards,
Minchan Kim

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  reply	other threads:[~2012-10-29  1:47 UTC|newest]

Thread overview: 95+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <Yes>
2012-07-16 16:14 ` [PATCH 1/3] mm: correct return value of migrate_pages() Joonsoo Kim
2012-07-16 16:14   ` [PATCH 2/3] mm: fix possible incorrect return value of migrate_pages() syscall Joonsoo Kim
2012-07-16 17:26     ` Christoph Lameter
2012-07-16 17:40     ` Michal Nazarewicz
2012-07-16 17:59       ` JoonSoo Kim
2012-07-17 13:02         ` Michal Nazarewicz
2012-07-16 16:14   ` [PATCH 3/3] mm: fix return value in __alloc_contig_migrate_range() Joonsoo Kim
2012-07-16 17:29     ` Christoph Lameter
2012-07-16 17:40     ` Michal Nazarewicz
2012-07-16 18:40       ` JoonSoo Kim
2012-07-17 13:16         ` Michal Nazarewicz
2012-07-16 17:14   ` [PATCH 4] mm: fix possible incorrect return value of move_pages() syscall Joonsoo Kim
2012-07-16 17:30     ` Christoph Lameter
2012-07-16 17:23   ` [PATCH 1/3] mm: correct return value of migrate_pages() Christoph Lameter
2012-07-16 17:32     ` JoonSoo Kim
2012-07-16 17:37       ` Christoph Lameter
2012-07-16 17:40   ` Michal Nazarewicz
2012-07-16 17:57     ` JoonSoo Kim
2012-07-16 18:05       ` Christoph Lameter
2012-07-17 12:33 ` [PATCH 1/4 v2] mm: correct return value of migrate_pages() and migrate_huge_pages() Joonsoo Kim
2012-07-17 12:33   ` [PATCH 2/4 v2] mm: fix possible incorrect return value of migrate_pages() syscall Joonsoo Kim
2012-07-17 14:28     ` Christoph Lameter
2012-07-17 15:41       ` JoonSoo Kim
2012-07-17 12:33   ` [PATCH 3/4 v2] mm: fix return value in __alloc_contig_migrate_range() Joonsoo Kim
2012-07-17 13:25     ` Michal Nazarewicz
2012-07-17 15:45       ` JoonSoo Kim
2012-07-17 15:49         ` [PATCH 3/4 v3] " Joonsoo Kim
2012-07-17 12:33   ` [PATCH 4/4 v2] mm: fix possible incorrect return value of move_pages() syscall Joonsoo Kim
2012-07-27 17:55 ` [RESEND PATCH 1/4 v3] mm: correct return value of migrate_pages() and migrate_huge_pages() Joonsoo Kim
2012-07-27 17:55   ` [RESEND PATCH 2/4 v3] mm: fix possible incorrect return value of migrate_pages() syscall Joonsoo Kim
2012-07-27 20:57     ` Christoph Lameter
2012-07-28  6:16       ` JoonSoo Kim
2012-07-30 19:30         ` Christoph Lameter
2012-07-27 17:55   ` [RESEND PATCH 3/4 v3] mm: fix return value in __alloc_contig_migrate_range() Joonsoo Kim
2012-07-27 17:55   ` [RESEND PATCH 4/4 v3] mm: fix possible incorrect return value of move_pages() syscall Joonsoo Kim
2012-07-27 20:54     ` Christoph Lameter
2012-07-28  6:09       ` JoonSoo Kim
2012-07-30 19:29         ` Christoph Lameter
2012-07-31  3:34           ` JoonSoo Kim
2012-07-31 14:04             ` Christoph Lameter
2012-08-01  5:15           ` Michael Kerrisk
2012-08-01 18:00             ` Christoph Lameter
2012-08-02  5:52               ` Michael Kerrisk
2012-08-24 16:05 ` [PATCH 1/2] slub: rename cpu_partial to max_cpu_object Joonsoo Kim
2012-08-24 16:05   ` [PATCH 2/2] slub: correct the calculation of the number of cpu objects in get_partial_node Joonsoo Kim
2012-08-24 16:15     ` Christoph Lameter
2012-08-24 16:28       ` JoonSoo Kim
2012-08-24 16:31         ` Christoph Lameter
2012-08-24 16:40           ` JoonSoo Kim
2012-08-24 16:12   ` [PATCH 1/2] slub: rename cpu_partial to max_cpu_object Christoph Lameter
2012-08-25 14:11 ` [PATCH 1/2] slab: do ClearSlabPfmemalloc() for all pages of slab Joonsoo Kim
2012-08-25 14:11   ` [PATCH 2/2] slab: fix starting index for finding another object Joonsoo Kim
2012-09-03 10:08   ` [PATCH 1/2] slab: do ClearSlabPfmemalloc() for all pages of slab Mel Gorman
2012-10-20 15:48 ` [PATCH for-v3.7 1/2] slub: optimize poorly inlined kmalloc* functions Joonsoo Kim
2012-10-20 15:48   ` [PATCH for-v3.7 2/2] slub: optimize kmalloc* inlining for GFP_DMA Joonsoo Kim
2012-10-22 14:31     ` Christoph Lameter
2012-10-23  2:29       ` JoonSoo Kim
2012-10-23  6:16         ` Eric Dumazet
2012-10-23 16:12           ` JoonSoo Kim
2012-10-24  8:05   ` [PATCH for-v3.7 1/2] slub: optimize poorly inlined kmalloc* functions Pekka Enberg
2012-10-24 13:36     ` Christoph Lameter
2012-10-28 19:12 ` [PATCH 0/5] minor clean-up and optimize highmem related code Joonsoo Kim
2012-10-28 19:12   ` [PATCH 1/5] mm, highmem: use PKMAP_NR() to calculate an index of pkmap Joonsoo Kim
2012-10-29  1:48     ` Minchan Kim
2012-10-28 19:12   ` [PATCH 2/5] mm, highmem: remove useless pool_lock Joonsoo Kim
2012-10-29  1:52     ` Minchan Kim [this message]
2012-10-30 21:31     ` Andrew Morton
2012-10-31  5:14       ` Minchan Kim
2012-10-31 15:01       ` JoonSoo Kim
2012-10-28 19:12   ` [PATCH 3/5] mm, highmem: remove page_address_pool list Joonsoo Kim
2012-10-29  1:57     ` Minchan Kim
2012-10-28 19:12   ` [PATCH 4/5] mm, highmem: makes flush_all_zero_pkmaps() return index of last flushed entry Joonsoo Kim
2012-10-29  2:06     ` Minchan Kim
2012-10-29 13:12       ` JoonSoo Kim
2012-10-28 19:12   ` [PATCH 5/5] mm, highmem: get virtual address of the page using PKMAP_ADDR() Joonsoo Kim
2012-10-29  2:09     ` Minchan Kim
2012-10-29  2:12   ` [PATCH 0/5] minor clean-up and optimize highmem related code Minchan Kim
2012-10-29 13:15     ` JoonSoo Kim
2012-10-31 17:11       ` JoonSoo Kim
2012-10-31 16:56 ` [PATCH v2 " Joonsoo Kim
2012-10-31 16:56   ` [PATCH v2 1/5] mm, highmem: use PKMAP_NR() to calculate an index of pkmap Joonsoo Kim
2012-10-31 16:56   ` [PATCH v2 2/5] mm, highmem: remove useless pool_lock Joonsoo Kim
2012-10-31 16:56   ` [PATCH v2 3/5] mm, highmem: remove page_address_pool list Joonsoo Kim
2012-10-31 16:56   ` [PATCH v2 4/5] mm, highmem: makes flush_all_zero_pkmaps() return index of first flushed entry Joonsoo Kim
2012-11-01  5:03     ` Minchan Kim
2012-11-02 19:07       ` JoonSoo Kim
2012-11-02 22:42         ` Minchan Kim
2012-11-13  0:30           ` JoonSoo Kim
2012-11-13 12:49             ` Minchan Kim
2012-11-13 14:12               ` JoonSoo Kim
2012-11-13 15:01                 ` Minchan Kim
2012-11-14 17:09                   ` JoonSoo Kim
2012-11-19 23:46                     ` Minchan Kim
2012-11-27 15:01                       ` JoonSoo Kim
2012-10-31 16:56   ` [PATCH v2 5/5] mm, highmem: get virtual address of the page using PKMAP_ADDR() Joonsoo Kim

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