hung_task: Display every hung task warning

When khungtaskd detects hung tasks, it prints out
backtraces from a number of those tasks.

Limiting the number of backtraces being printed
out can result in the user not seeing the information
necessary to debug the issue. The hung_task_warnings
sysctl controls this feature.

This patch makes it possible for hung_task_warnings
to accept a special value to print an unlimited
number of backtraces when khungtaskd detects hung
tasks.

The special value is -1. To use this value it is
necessary to change types from ulong to int.

Signed-off-by: Aaron Tomlin <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
[ Build warning fix. ]
Signed-off-by: Ingo Molnar <[email protected]>

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