[PATCH 0/4 v4] max_threadx handling

From: Heinrich Schuchardt
Date: Mon Feb 23 2015 - 15:16:30 EST

In fork_init a division by zero may occur.

In the first patch the calculation of max_threads is moved from fork_init
to a new separate function.

The incorrect calculation of max threads is addressed in the
second patch.

Furthermore max_threads is checked against FUTEX_TID_MASK.

The third patch addresses max_threads being set by writing to
/proc/sys/kernel/threads-max. The same limits are applied as
in fork_init.

The fourth patch uses a callback function to update max_threads when
a memory hotplug event occurs.

New in version 4:
Separate of refactoring and correction into separate patches
(as requested by Ingo Molnar)
Remove redundant argument of fork_init

New in version 3:
Determination of max_threads moved to separate function.
Handling of /proc/sys/kernel/threads-max
Handling of memory hotplugging.

Heinrich Schuchardt (4):
kernel/fork.c: new function for max_threads
kernel/fork.c: avoid division by zero
kernel/sysctl.c: threads-max observe limits
kernel/fork.c: memory hotplug updates max_threads

include/linux/sysctl.h | 3 ++
init/main.c | 4 +-
kernel/fork.c | 112 +++++++++++++++++++++++++++++++++++++++++--------
kernel/sysctl.c | 6 +--
4 files changed, 102 insertions(+), 23 deletions(-)


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