linux-kernel - Re: [PATCH 1/2] irq_flags_t: intro and core annotations

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Message-Id: <E1IkAWI-0006vX-00@gondolin.me.apana.org.au>
Date:	Tue, 23 Oct 2007 11:33:30 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	jeff@...zik.org (Jeff Garzik)
Cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	matthew@....cx, arnd@...db.de, ralf@...ux-mips.org,
	adobriyan@...il.com, viro@....linux.org.uk,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/2] irq_flags_t: intro and core annotations

Jeff Garzik <jeff@...zik.org> wrote:
> 
> Let me add to the chorus of voices:  I continually see two cases where 
> real bugs crop up:
> 
> 1) hacker uses spin_lock_irq() in incorrect context (where it is not 
> safe to do a blind enable/disable)
> 
> 2) hacker uses spin_lock_irq() correctly, but the surrounding code 
> changes, thus invalidating prior assumptions.
> 
> I would even go so far as to support the drastic measure of deleting 
> spin_lock_irq().
> 
> spin_lock_irqsave() generates fewer bugs, is more future-proof, and by 
> virtue of 'flags' permits architectures a bit more flexibility.

Could we add a debug option that warned if spin_lock_irq is
executed with IRQs turned off already?

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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