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rcu: Make SRCU optional by using CONFIG_SRCU

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SRCU is not necessary to be compiled by default in all cases. For tinification
efforts not compiling SRCU unless necessary is desirable.

The current patch tries to make compiling SRCU optional by introducing a new
Kconfig option CONFIG_SRCU which is selected when any of the components making
use of SRCU are selected.

If we do not select CONFIG_SRCU, srcu.o will not be compiled at all.

   text    data     bss     dec     hex filename
   2007       0       0    2007     7d7 kernel/rcu/srcu.o

Size of arch/powerpc/boot/zImage changes from

   text    data     bss     dec     hex filename
 831552   64180   23944  919676   e087c arch/powerpc/boot/zImage : before
 829504   64180   23952  917636   e0084 arch/powerpc/boot/zImage : after

so the savings are about ~2000 bytes.

Signed-off-by: Pranith Kumar <[email protected]>
CC: Paul E. McKenney <[email protected]>
CC: Josh Triplett <[email protected]>
CC: Lai Jiangshan <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
[ paulmck: resolve conflict due to removal of arch/ia64/kvm/Kconfig. ]
This commit is contained in:
Pranith Kumar 2014-12-05 11:24:45 -05:00 • committed by Paul E. McKenney
commit 83fe27ea53
23 changed files with 34 additions and 1 deletions
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1
mm/Kconfig
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@ -325,6 +325,7 @@ config VIRT_TO_BUS
config MMU_NOTIFIER
bool
select SRCU
config KSM
bool "Enable KSM for page merging"