linux-kernel - Re: [PATCH 21/41] block: Replace __this_cpu_ptr with raw_cpu

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Date:	Tue, 3 Dec 2013 19:20:16 -0700
From:	Jens Axboe <axboe@...nel.dk>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Tejun Heo <tj@...nel.org>, akpm@...uxfoundation.org,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 21/41] block: Replace __this_cpu_ptr with raw_cpu_ptr

On Tue, Dec 03 2013, Christoph Lameter wrote:
> __this_cpu_ptr is being phased out.
> 
> Cc: Jens Axboe <axboe@...nel.dk>
> Signed-off-by: Christoph Lameter <cl@...ux.com>
> 
> Index: linux/fs/ext4/mballoc.c
> ===================================================================
> --- linux.orig/fs/ext4/mballoc.c	2013-12-02 16:07:53.574528512 -0600
> +++ linux/fs/ext4/mballoc.c	2013-12-02 16:07:53.574528512 -0600
> @@ -4085,7 +4085,7 @@ static void ext4_mb_group_or_file(struct
>  	 * per cpu locality group is to reduce the contention between block
>  	 * request from multiple CPUs.
>  	 */
> -	ac->ac_lg = __this_cpu_ptr(sbi->s_locality_groups);
> +	ac->ac_lg = raw_cpu_ptr(sbi->s_locality_groups);
>  
>  	/* we're going to use group allocation */
>  	ac->ac_flags |= EXT4_MB_HINT_GROUP_ALLOC;
> Index: linux/fs/buffer.c
> ===================================================================
> --- linux.orig/fs/buffer.c	2013-12-02 16:07:53.574528512 -0600
> +++ linux/fs/buffer.c	2013-12-02 16:07:53.574528512 -0600
> @@ -1312,7 +1312,7 @@ static void bh_lru_install(struct buffer
>  		}
>  		while (out < BH_LRU_SIZE)
>  			bhs[out++] = NULL;
> -		memcpy(__this_cpu_ptr(&bh_lrus.bhs), bhs, sizeof(bhs));
> +		memcpy(this_cpu_ptr(&bh_lrus.bhs), bhs, sizeof(bhs));
>  	}
>  	bh_lru_unlock();

Christoph, I applied the fs/buffer.c bit, the ext4 one should probably
go through Ted.

-- 
Jens Axboe

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