linux-kernel - [Q] mm/memblock.c: cast truncates bits from RED

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Date:	Tue, 14 Jun 2011 19:47:19 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [Q] mm/memblock.c: cast truncates bits from RED_INACTIVE

Hello all,

Sparse is reporting a couple warnings in mm/memblock.c:

	warning: cast truncates bits from constant value (9f911029d74e35b becomes 9d74e35b)

The warnings are due to the cast of RED_INACTIVE in memblock_analyze():

	/* Check marker in the unused last array entry */
	WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
		!= (phys_addr_t)RED_INACTIVE);
	WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
		!= (phys_addr_t)RED_INACTIVE);

And in memblock_init():

	/* Write a marker in the unused last array entry */
	memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;
	memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;

Could this cause any problems?  If not, is there anyway to quiet the sparse noise?

Regards,
Hartley