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| author | John Stultz <johnstul@us.ibm.com> | 2010-08-13 11:30:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-13 12:03:24 -0700 |
| commit | c7dcf87a6881bf796faee83003163eb3de41a309 (patch) | |
| tree | 1e4333e588ad6e8e69e310d8ae71798af1c0bdb5 /kernel/timer.c | |
| parent | 2be1f3a73dd02e38e181cf5abacb3d45a6a2d6b8 (diff) | |
| download | op-kernel-dev-c7dcf87a6881bf796faee83003163eb3de41a309.zip op-kernel-dev-c7dcf87a6881bf796faee83003163eb3de41a309.tar.gz | |
time: Workaround gcc loop optimization that causes 64bit div errors
Early 4.3 versions of gcc apparently aggressively optimize the raw
time accumulation loop, replacing it with a divide.
On 32bit systems, this causes the following link errors:
undefined reference to `__umoddi3'
undefined reference to `__udivdi3'
The gcc issue has been fixed in 4.4 and greater.
This patch replaces the accumulation loop with a do_div, as suggested
by Linus.
Signed-off-by: John Stultz <johnstul@us.ibm.com>
CC: Jason Wessel <jason.wessel@windriver.com>
CC: Larry Finger <Larry.Finger@lwfinger.net>
CC: Ingo Molnar <mingo@elte.hu>
CC: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/timer.c')
0 files changed, 0 insertions, 0 deletions
