Re: [RFC, 2.6] a simple FIFO implementation

[Ryan Cumming]

On Friday 17 September 2004 15:00, Andrea Arcangeli wrote:
> This is likely a candidate to go in include/linux/kernel.h (maybe under
> the name roundup_pow_of_two to avoid misunderstanding with the much more
> common PAGE_SIZE roundups)

How does this look?

-Ryan
--- include/linux/kernel.h	2004-09-16 06:38:19.000000000 -0700
+++ include/linux/kernel.h	2004-09-17 15:12:20.598844004 -0700
@@ -12,6 +12,7 @@
 #include <linux/stddef.h>
 #include <linux/types.h>
 #include <linux/compiler.h>
+#include <linux/bitops.h>
 #include <asm/byteorder.h>
 #include <asm/bug.h>
 
@@ -111,6 +112,10 @@
 	return r;
 }
 
+static inline unsigned long __attribute_pure__ roundup_pow_of_two(int x)
+{
+	return (1UL << fls(x));
+}
 
 extern int printk_ratelimit(void);
 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);

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