linux-kernel - Re: [RFC][PATCH] kmap_atomic

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Message-ID: <87ws30fppe.fsf@basil.nowhere.org>
Date:	Mon, 12 Oct 2009 20:10:37 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"hugh.dickins" <hugh.dickins@...cali.co.uk>,
	David Howells <dhowells@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [RFC][PATCH] kmap_atomic_push

Peter Zijlstra <peterz@...radead.org> writes:
> -
> -static inline void debug_kmap_atomic(enum km_type type)
> +static inline int kmap_atomic_push_idx(void)
>  {
> +	int idx = __get_cpu_var(__kmap_atomic_depth)++;

The counter needs to be of local atomic type. Otherwise kmap_atomic cannot
be done from interrupts/nmis, which is unfortunately occasionally needed.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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