linux-kernel - Re: [patch] cpufreq: mark cpufreq_tsc() as core_initcall

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Message-ID: <20061120175848.GD8055@kernel.dk>
Date:	Mon, 20 Nov 2006 18:58:49 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Paul E. McKenney" <paulmck@...ibm.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [patch] cpufreq: mark cpufreq_tsc() as core_initcall_sync

On Mon, Nov 20 2006, Alan Stern wrote:
> Paul:
> 
> Here's my version of your patch from yesterday.  It's basically the same, 
> but I cleaned up the code in a few places and fixed a bug (the sign of idx 
> in srcu_read_unlock).  Also I changed the init routine back to void, since 
> it's no longer an error if the per-cpu allocation fails.
> 
> More importantly, I added a static initializer and included the fast-path 
> in synchronize_srcu.  It's protected by the new symbol 
> SMP__STORE_MB_LOAD_WORKS, which should be defined in arch-specific headers 
> for those architectures where the store-mb-load pattern is safe.

Must we introduce memory allocations in srcu_read_lock()? It makes it
much harder and nastier for me to use. I'd much prefer a failing
init_srcu(), seems like a much better API.

-- 
Jens Axboe

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