smpboot/threads, watchdog/core: Avoid runtime allocation
authorThomas Gleixner <tglx@linutronix.de>
Tue, 12 Sep 2017 19:37:09 +0000 (21:37 +0200)
committerIngo Molnar <mingo@kernel.org>
Thu, 14 Sep 2017 09:41:06 +0000 (11:41 +0200)
commit0d85923c7a81719567311ba0eae8ecb2efd4c8a0
tree34c854caa12350d56552dbae1545d6484a8d13c3
parent05ba3de74a3f499dcaa37b186220aaf174c95a4b
smpboot/threads, watchdog/core: Avoid runtime allocation

smpboot_update_cpumask_threads_percpu() allocates a temporary cpumask at
runtime. This is suboptimal because the call site needs more code size for
proper error handling than a statically allocated temporary mask requires
data size.

Add static temporary cpumask. The function is globaly serialized, so no
further protection required.

Remove the half baken error handling in the watchdog code and get rid of
the export as there are no in tree modular users of that function.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Don Zickus <dzickus@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Link: http://lkml.kernel.org/r/20170912194147.297288838@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
include/linux/smpboot.h
kernel/smpboot.c
kernel/watchdog.c