linux-toradex.git/fs/proc/uptime.c, branch v3.0.43 Linux kernel for Apalis and Colibri modules fix cputime overflow in uptime_proc_show 2012-01-26T01:24:53+00:00 Martin Schwidefsky schwidefsky@de.ibm.com 2011-12-15T13:56:10+00:00 3ec3f83aee534f732fd7012ff6c04776952e47fd commit c3e0ef9a298e028a82ada28101ccd5cf64d209ee upstream. For 32-bit architectures using standard jiffies the idletime calculation in uptime_proc_show will quickly overflow. It takes (2^32 / HZ) seconds of idle-time, or e.g. 12.45 days with no load on a quad-core with HZ=1000. Switch to 64-bit calculations. Cc: Michael Abbott <michael.abbott@diamond.ac.uk> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> 
commit c3e0ef9a298e028a82ada28101ccd5cf64d209ee upstream.

For 32-bit architectures using standard jiffies the idletime calculation
in uptime_proc_show will quickly overflow. It takes (2^32 / HZ) seconds
of idle-time, or e.g. 12.45 days with no load on a quad-core with HZ=1000.
Switch to 64-bit calculations.

Cc: Michael Abbott <michael.abbott@diamond.ac.uk>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
[PATCH] Fix idle time field in /proc/uptime 2009-09-24T08:16:24+00:00 Michael Abbott michael.abbott@diamond.ac.uk 2009-09-24T08:15:19+00:00 96830a57de1197519b62af6a4c9ceea556c18c3d Git commit 79741dd changes idle cputime accounting, but unfortunately the /proc/uptime file hasn't caught up. Here the idle time calculation from /proc/stat is copied over. Signed-off-by: Michael Abbott <michael.abbott@diamond.ac.uk> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 
Git commit 79741dd changes idle cputime accounting, but unfortunately
the /proc/uptime file hasn't caught up.  Here the idle time calculation
from /proc/stat is copied over.

Signed-off-by: Michael Abbott <michael.abbott@diamond.ac.uk>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Revert "proc: revert /proc/uptime to ->read_proc hook" 2009-03-30T21:14:58+00:00 Alexey Dobriyan adobriyan@gmail.com 2009-02-20T14:07:22+00:00 a9caa3de249a6c43bc9c6aec87881f09276677e3 This reverts commit 6c87df37dcb9c6c33923707fa5191e0a65874d60. proc files implemented through seq_file do pread(2) now. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> 
This reverts commit 6c87df37dcb9c6c33923707fa5191e0a65874d60.

proc files implemented through seq_file do pread(2) now.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
proc: revert /proc/uptime to ->read_proc hook 2008-10-27T19:56:56+00:00 Alexey Dobriyan adobriyan@gmail.com 2008-10-27T19:38:27+00:00 6c87df37dcb9c6c33923707fa5191e0a65874d60 Turned out some VMware userspace does pread(2) on /proc/uptime, but seqfiles currently don't allow pread() resulting in -ESPIPE. Seqfiles in theory can do pread(), but this can be a long story, so revert to ->read_proc until then. http://bugzilla.kernel.org/show_bug.cgi?id=11856 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> 
Turned out some VMware userspace does pread(2) on /proc/uptime, but
seqfiles currently don't allow pread() resulting in -ESPIPE.

Seqfiles in theory can do pread(), but this can be a long story,
so revert to ->read_proc until then.

http://bugzilla.kernel.org/show_bug.cgi?id=11856

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
proc: switch /proc/uptime to seq_file 2008-10-23T09:48:01+00:00 Alexey Dobriyan adobriyan@gmail.com 2008-10-02T22:38:18+00:00 9617760287eec9091d26e6967bd3e4194de18f97 and move it to fs/proc/uptime.c while I'm at it. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> 
and move it to fs/proc/uptime.c while I'm at it.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>