speed up jiffies conversion functions if HZ==USER_HZ · ec03d70739 - Gogs

speed up jiffies conversion functions if HZ==USER_HZ

Avoid calling do_div(x, 1) in this case.

Cc: David Fries <david@fries.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Andrew Morton 17 years ago

parent

6ffc787a44

commit

ec03d70739

1 changed files with 3 additions and 1 deletions

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							+ 3
							
							- 1
						
kernel/time.c
							 
								View File
							
				@@ -606,8 +606,10 @@ u64 jiffies_64_to_clock_t(u64 x)
			
				 # if HZ < USER_HZ
			
				 	x *= USER_HZ;
			
				 	do_div(x, HZ);
			
				-# else
			
				+# elif HZ > USER_HZ
			
				 	do_div(x, HZ / USER_HZ);
			
				+# else
			
				+	/* Nothing to do */
			
				 # endif
			
				 #else
			
				 	/*