linux-kernel - Re: [PATCH v6 05/15] lockdep: Implement crossrelease feature

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Message-ID: <20170419172019.rohvxmtdalas6g57@hirez.programming.kicks-ass.net>
Date:   Wed, 19 Apr 2017 19:20:19 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     mingo@...nel.org, tglx@...utronix.de, walken@...gle.com,
        boqun.feng@...il.com, kirill@...temov.name,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        willy@...radead.org, npiggin@...il.com, kernel-team@....com
Subject: Re: [PATCH v6 05/15] lockdep: Implement crossrelease feature

On Tue, Mar 14, 2017 at 05:18:52PM +0900, Byungchul Park wrote:
> +config LOCKDEP_CROSSRELEASE
> +	bool "Lock debugging: make lockdep work for crosslocks"
> +	select PROVE_LOCKING

	depends PROVE_LOCKING

instead ?

> +	default n
> +	help
> +	 This makes lockdep work for crosslock which is a lock allowed to
> +	 be released in a different context from the acquisition context.
> +	 Normally a lock must be released in the context acquiring the lock.
> +	 However, relexing this constraint helps synchronization primitives
> +	 such as page locks or completions can use the lock correctness
> +	 detector, lockdep.
> +
>  config PROVE_LOCKING
>  	bool "Lock debugging: prove locking correctness"
>  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
> -- 
> 1.9.1
>