linux-kernel - Re: [PATCH 3/4] ide: don't disable interrupts during kmap

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Message-Id: <20180504.133856.1141367626604511178.davem@davemloft.net>
Date:   Fri, 04 May 2018 13:38:56 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     bigeasy@...utronix.de
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de
Subject: Re: [PATCH 3/4] ide: don't disable interrupts during kmap_atomic()

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Date: Fri,  4 May 2018 16:24:45 +0200

> ide_pio_bytes() disables interrupts around kmap_atomic(). This is a
> leftover from the old kmap_atomic() implementation which relied on fixed
> mapping slots, so the caller had to make sure that the same slot could not
> be reused from an interrupting context.
> 
> kmap_atomic() was changed to dynamic slots long ago and commit 1ec9c5ddc17a
> ("include/linux/highmem.h: remove the second argument of k[un]map_atomic()")
> removed the slot assignements, but the callers were not checked for now
> redundant interrupt disabling.
> 
> Remove the conditional interrupt disable.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Acked-by: David S. Miller <davem@...emloft.net>