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SubjectRe: [Bug #11035] System hangs on 2.6.26-rc8
Em Thu, 10 Jul 2008 16:29:39 +0400
Roman Mindalev <lists@r000n.net> escreveu:

| Rafael J. Wysocki wrote:
| > This message has been generated automatically as a part of a report
| > of recent regressions.
| >
| > The following bug entry is on the current list of known regressions
| > from 2.6.25. Please verify if it still should be listed.
| >
| >
| > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=11035
| > Subject : System hangs on 2.6.26-rc8
| > Submitter : Roman Mindalev <lists@r000n.net>
| > Date : 2008-07-02 14:25 (5 days old)
| > References : http://marc.info/?l=linux-kernel&m=121500871414995&w=4
| >
| >
| >
| I have this problem with 2.6.25 too.
| Unfortunately, I can't check 2.6.24. With config from 2.6.26-rc8 I got
| error of compiling:
|
| LD .tmp_vmlinux1
| kernel/built-in.o: In function `timespec_add_ns':
| /usr/src/kernels/linux-2.6.24/include/linux/time.h:179: undefined
| reference to `__umoddi3'

[...]

You're trying to compile with gcc 4.3, right? You can try the
attached fix or the following cherry-pick if you're compiling
from a git tree:

$ git cherry-pick 38332cb98772f5ea757e6486bed7ed0381cb5f98

But I can't tell whether the compiler and/or the fix will
change the behaivor of the bug you're reporting.

--
Luiz Fernando N. Capitulino
commit 38332cb98772f5ea757e6486bed7ed0381cb5f98
Author: Segher Boessenkool <segher@kernel.crashing.org>
Date: Tue Mar 4 14:59:54 2008 -0800

time: prevent the loop in timespec_add_ns() from being optimised away

Since some architectures don't support __udivdi3().

Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/include/linux/time.h b/include/linux/time.h
index 2091a19..d32ef0a 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -174,6 +174,10 @@ static inline void timespec_add_ns(struct timespec *a, u64 ns)
{
ns += a->tv_nsec;
while(unlikely(ns >= NSEC_PER_SEC)) {
+ /* The following asm() prevents the compiler from
+ * optimising this loop into a modulo operation. */
+ asm("" : "+r"(ns));
+
ns -= NSEC_PER_SEC;
a->tv_sec++;
}
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