PAGE_SIZE query

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Subject: PAGE_SIZE query
From: "Nikhil Talpallikar" <nikhil.talpallikar@xxxxxxxxx>
Date: Mon, 21 Apr 2008 20:25:23 +0530

Hi,

What is "1UL" in PAGE_SIZE macro?

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 12
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))

cheers,
Nikhil

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