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Commit 3b171672 authored by Dmitriy Zavin's avatar Dmitriy Zavin Committed by Andi Kleen
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[PATCH] Add 64bit jiffies compares (for use with get_jiffies_64) 



The current time_before/time_after macros will fail typechecks
when passed u64 values (as returned by get_jiffies_64()). On 64bit
systems, this will just result in a warning about mismatching types
without explicit casts, but since unsigned long and u64
(unsigned long long) are of same size, it will still work.
On 32bit systems, a long is 32bits, so the value from get_jiffies_64()
will be truncated by the cast and thus lose all the precision gained by
64bit jiffies.

Signed-off-by: default avatarDmitriy Zavin <dmitriyz@google.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent b89ebd0b

include/linux/jiffies.h

+15 −0
Original line number Original line Diff line number Diff line
@@ -115,6 +115,21 @@ static inline u64 get_jiffies_64(void) 
	 ((long)(a) - (long)(b) >= 0))

	 ((long)(a) - (long)(b) >= 0))

#define time_before_eq(a,b)	time_after_eq(b,a)

#define time_before_eq(a,b)	time_after_eq(b,a)





/* Same as above, but does so with platform independent 64bit types.

 * These must be used when utilizing jiffies_64 (i.e. return value of

 * get_jiffies_64() */

#define time_after64(a,b)	\

	(typecheck(__u64, a) &&	\

	 typecheck(__u64, b) && \

	 ((__s64)(b) - (__s64)(a) < 0))

#define time_before64(a,b)	time_after64(b,a)



#define time_after_eq64(a,b)	\

	(typecheck(__u64, a) && \

	 typecheck(__u64, b) && \

	 ((__s64)(a) - (__s64)(b) >= 0))

#define time_before_eq64(a,b)	time_after_eq64(b,a)



/*

/*

 * Have the 32 bit jiffies value wrap 5 minutes after boot

 * Have the 32 bit jiffies value wrap 5 minutes after boot

 * so jiffies wrap bugs show up earlier.

 * so jiffies wrap bugs show up earlier.