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authorHeiko Carstens <heiko.carstens@de.ibm.com>2013-09-18 13:45:36 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-24 19:16:55 +0400
commit746479cdcbb131a0645e8cb4a35d6b26126e3e4c (patch)
tree7cf0fa041804197c14abe21c56bdf27c82274718 /arch/s390/lib/Makefile
parent8e6a8285668b139460cc6852bfd58fdbd00c7157 (diff)
downloadlinux-746479cdcbb131a0645e8cb4a35d6b26126e3e4c.tar.xz
s390/bitops: use generic find bit functions / reimplement _left variant
Just like all other architectures we should use out-of-line find bit operations, since the inline variant bloat the size of the kernel image. And also like all other architecures we should only supply optimized variants of the __ffs, ffs, etc. primitives. Therefore this patch removes the inlined s390 find bit functions and uses the generic out-of-line variants instead. The optimization of the primitives follows with the next patch. With this patch also the functions find_first_bit_left() and find_next_bit_left() have been reimplemented, since logically, they are nothing else but a find_first_bit()/find_next_bit() implementation that use an inverted __fls() instead of __ffs(). Also the restriction that these functions only work on machines which support the "flogr" instruction is gone now. This reduces the size of the kernel image (defconfig, -march=z9-109) by 144,482 bytes. Alone the size of the function build_sched_domains() gets reduced from 7 KB to 3,5 KB. We also git rid of unused functions like find_first_bit_le()... Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/lib/Makefile')
-rw-r--r--arch/s390/lib/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index 20b0e97a7df2..e506c5fb6f6a 100644
--- a/arch/s390/lib/Makefile
+++ b/arch/s390/lib/Makefile
@@ -2,7 +2,7 @@
# Makefile for s390-specific library files..
#
-lib-y += delay.o string.o uaccess_std.o uaccess_pt.o
+lib-y += delay.o string.o uaccess_std.o uaccess_pt.o find.o
obj-$(CONFIG_32BIT) += div64.o qrnnd.o ucmpdi2.o mem32.o
obj-$(CONFIG_64BIT) += mem64.o
lib-$(CONFIG_64BIT) += uaccess_mvcos.o