diff options
author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-09-18 05:45:36 -0400 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-24 11:16:55 -0400 |
commit | 746479cdcbb131a0645e8cb4a35d6b26126e3e4c (patch) | |
tree | 7cf0fa041804197c14abe21c56bdf27c82274718 /arch/s390/kernel/Makefile | |
parent | 8e6a8285668b139460cc6852bfd58fdbd00c7157 (diff) |
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/kernel/Makefile')
-rw-r--r-- | arch/s390/kernel/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index 4bb2a4656163..2403303cfed7 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile | |||
@@ -28,7 +28,7 @@ CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' | |||
28 | 28 | ||
29 | CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w | 29 | CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w |
30 | 30 | ||
31 | obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o | 31 | obj-y := traps.o time.o process.o base.o early.o setup.o vtime.o |
32 | obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o | 32 | obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o |
33 | obj-y += debug.o irq.o ipl.o dis.o diag.o sclp.o vdso.o | 33 | obj-y += debug.o irq.o ipl.o dis.o diag.o sclp.o vdso.o |
34 | obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o | 34 | obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o |