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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
902137ba8e
Commit 18ad51dd34 ("powerpc: Add VDSO version of getcpu") added
getcpu() for PPC64 only, by making use of a user readable general
purpose SPR.
PPC32 doesn't have any such SPR.
For non SMP, just return CPU id 0 from the VDSO directly.
PPC32 doesn't support CONFIG_NUMA so NUMA node is always 0.
Before the patch, vdsotest reported:
getcpu: syscall: 1572 nsec/call
getcpu: libc: 1787 nsec/call
getcpu: vdso: not tested
Now, vdsotest reports:
getcpu: syscall: 1582 nsec/call
getcpu: libc: 502 nsec/call
getcpu: vdso: 187 nsec/call
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/eaac4b6494ecff1811220fccc895bf282aab884a.1575273217.git.christophe.leroy@c-s.fr
66 lines
1.6 KiB
Makefile
66 lines
1.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# List of files in the vdso, has to be asm only for now
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obj-vdso32 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o getcpu.o
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# Build rules
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ifdef CROSS32_COMPILE
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VDSOCC := $(CROSS32_COMPILE)gcc
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else
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VDSOCC := $(CC)
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endif
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CC32FLAGS :=
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ifdef CONFIG_PPC64
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CC32FLAGS += -m32
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endif
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targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
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obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
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GCOV_PROFILE := n
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KCOV_INSTRUMENT := n
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UBSAN_SANITIZE := n
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ccflags-y := -shared -fno-common -fno-builtin -nostdlib \
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-Wl,-soname=linux-vdso32.so.1 -Wl,--hash-style=both
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asflags-y := -D__VDSO32__ -s
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obj-y += vdso32_wrapper.o
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extra-y += vdso32.lds
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CPPFLAGS_vdso32.lds += -P -C -Upowerpc
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# Force dependency (incbin is bad)
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$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
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# link rule for the .so file, .lds has to be first
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$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE
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$(call if_changed,vdso32ld)
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# strip rule for the .so file
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$(obj)/%.so: OBJCOPYFLAGS := -S
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$(obj)/%.so: $(obj)/%.so.dbg FORCE
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$(call if_changed,objcopy)
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# assembly rules for the .S files
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$(obj-vdso32): %.o: %.S FORCE
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$(call if_changed_dep,vdso32as)
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# actual build commands
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quiet_cmd_vdso32ld = VDSO32L $@
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cmd_vdso32ld = $(VDSOCC) $(c_flags) $(CC32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^)
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quiet_cmd_vdso32as = VDSO32A $@
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cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) -c -o $@ $<
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# install commands for the unstripped file
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quiet_cmd_vdso_install = INSTALL $@
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cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
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vdso32.so: $(obj)/vdso32.so.dbg
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@mkdir -p $(MODLIB)/vdso
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$(call cmd,vdso_install)
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vdso_install: vdso32.so
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