linux-kernel - Re: [PATCH v2 7/7] zram: Use local lock to protect per-CPU data

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Date:   Mon, 25 May 2020 09:26:48 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Galbraith <umgwanakikbuti@...il.com>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH v2 7/7] zram: Use local lock to protect per-CPU data


* Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> --- a/drivers/block/zram/zcomp.h
> +++ b/drivers/block/zram/zcomp.h
> @@ -5,11 +5,13 @@
>  
>  #ifndef _ZCOMP_H_
>  #define _ZCOMP_H_
> +#include <linux/locallock.h>
>  
>  struct zcomp_strm {
>  	/* compression/decompression buffer */
>  	void *buffer;
>  	struct crypto_comp *tfm;
> +	struct local_lock lock;
>  };

I believe the general pattern is to put the lock in front of the 
fields it protects.

I'd also add a comment documenting that both fields ->buffer and ->tfm 
are protected by the lock.

Thanks,

	Ingo