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authorZhaolei <zhaolei@cn.fujitsu.com>2009-09-23 15:56:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-24 07:20:56 -0700
commit57f1f0874f426a9bdfc5cd3f886113dd5cd17834 (patch)
treef7938f5c195f7733543d3d86c6ae3c902fd7adef /Documentation
parentef1ff6b8c08954bc203b59e887d1e580dd91755a (diff)
downloadlinux-57f1f0874f426a9bdfc5cd3f886113dd5cd17834.tar.bz2
time: add function to convert between calendar time and broken-down time for universal use
There are many similar code in kernel for one object: convert time between calendar time and broken-down time. Here is some source I found: fs/ncpfs/dir.c fs/smbfs/proc.c fs/fat/misc.c fs/udf/udftime.c fs/cifs/netmisc.c net/netfilter/xt_time.c drivers/scsi/ips.c drivers/input/misc/hp_sdc_rtc.c drivers/rtc/rtc-lib.c arch/ia64/hp/sim/boot/fw-emu.c arch/m68k/mac/misc.c arch/powerpc/kernel/time.c arch/parisc/include/asm/rtc.h ... We can make a common function for this type of conversion, At least we can get following benefit: 1: Make kernel simple and unify 2: Easy to fix bug in converting code 3: Reduce clone of code in future For example, I'm trying to make ftrace display walltime, this patch will make me easy. This code is based on code from glibc-2.6 Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Pavel Machek <pavel@ucw.cz> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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