linux-kernel - Re: [patch] x86: add compilation checks to pci_unmap

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Date:	Sun, 29 Jun 2008 14:52:36 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Matti Linnanvuori <mattilinn@...il.com>
cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] x86: add compilation checks to pci_unmap_ macros


On Sunday 2008-06-29 08:22, Matti Linnanvuori wrote:
>+#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)	dma_addr_t ADDR_NAME[0];
>+#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)	unsigned LEN_NAME[0];
>+#define pci_unmap_addr(PTR, ADDR_NAME)	sizeof((PTR)->ADDR_NAME)
>+#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) \
>+	do { break; } while (pci_unmap_addr(PTR, ADDR_NAME))

Mh. If addr_name happens to be non-0 for some reason (like, a typo),
then this just introduces a lockup.
(Better to have a no-op with a typo than a sudden lockup. Given
that these are no-ops means they are deprecated, is not it the case?)
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