746479cdcb
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>
71 lines
2.2 KiB
Makefile
71 lines
2.2 KiB
Makefile
#
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# Makefile for the linux kernel.
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#
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ifdef CONFIG_FUNCTION_TRACER
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# Don't trace early setup code and tracing code
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CFLAGS_REMOVE_early.o = -pg
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CFLAGS_REMOVE_ftrace.o = -pg
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endif
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#
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# Passing null pointers is ok for smp code, since we access the lowcore here.
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#
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CFLAGS_smp.o := -Wno-nonnull
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#
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# Disable tailcall optimizations for stack / callchain walking functions
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# since this might generate broken code when accessing register 15 and
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# passing its content to other functions.
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#
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CFLAGS_stacktrace.o += -fno-optimize-sibling-calls
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CFLAGS_dumpstack.o += -fno-optimize-sibling-calls
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#
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# Pass UTS_MACHINE for user_regset definition
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#
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CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
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CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w
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obj-y := traps.o time.o process.o base.o early.o setup.o vtime.o
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obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
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obj-y += debug.o irq.o ipl.o dis.o diag.o sclp.o vdso.o
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obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
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obj-y += dumpstack.o
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obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
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obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
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obj-y += $(if $(CONFIG_64BIT),relocate_kernel64.o,relocate_kernel.o)
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extra-y += head.o vmlinux.lds
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extra-y += $(if $(CONFIG_64BIT),head64.o,head31.o)
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obj-$(CONFIG_MODULES) += s390_ksyms.o module.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_SCHED_BOOK) += topology.o
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obj-$(CONFIG_HIBERNATION) += suspend.o swsusp_asm64.o
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obj-$(CONFIG_AUDIT) += audit.o
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compat-obj-$(CONFIG_AUDIT) += compat_audit.o
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obj-$(CONFIG_COMPAT) += compat_linux.o compat_signal.o \
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compat_wrapper.o compat_exec_domain.o \
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$(compat-obj-y)
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_FUNCTION_TRACER) += $(if $(CONFIG_64BIT),mcount64.o,mcount.o)
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obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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ifdef CONFIG_64BIT
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o
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obj-y += runtime_instr.o cache.o
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endif
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# vdso
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obj-$(CONFIG_64BIT) += vdso64/
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obj-$(CONFIG_32BIT) += vdso32/
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obj-$(CONFIG_COMPAT) += vdso32/
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