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modpost: invoke modpost only when input files are updated
Currently, the second pass of modpost is always invoked when you run 'make' or 'make modules' even if none of modules is changed. Use if_changed to invoke it only when it is necessary. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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parent
269a535ca9
commit
436b2ac603
scripts
@ -90,7 +90,7 @@ endif
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# modpost options for modules (both in-kernel and external)
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MODPOST += \
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$(addprefix -i ,$(input-symdump)) \
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$(addprefix -i ,$(wildcard $(input-symdump))) \
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$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)
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# 'make -i -k' ignores compile errors, and builds as many modules as possible.
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@ -98,13 +98,18 @@ ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
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MODPOST += -n
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endif
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$(input-symdump):
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@:
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# Read out modules.order to pass in modpost.
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# Otherwise, allmodconfig would fail with "Argument list too long".
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quiet_cmd_modpost = MODPOST $@
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cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST) -T -
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cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T -
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$(output-symdump): FORCE
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$(call cmd,modpost)
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$(output-symdump): $(MODORDER) $(input-symdump) FORCE
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$(call if_changed,modpost)
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targets += $(output-symdump)
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__modpost: $(output-symdump)
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ifneq ($(KBUILD_MODPOST_NOFINAL),1)
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@ -114,6 +119,13 @@ endif
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PHONY += FORCE
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FORCE:
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existing-targets := $(wildcard $(sort $(targets)))
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-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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PHONY += FORCE
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FORCE:
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endif
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.PHONY: $(PHONY)
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@ -2375,6 +2375,25 @@ static void add_srcversion(struct buffer *b, struct module *mod)
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}
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}
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static void write_buf(struct buffer *b, const char *fname)
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{
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FILE *file;
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file = fopen(fname, "w");
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if (!file) {
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perror(fname);
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exit(1);
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}
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if (fwrite(b->p, 1, b->pos, file) != b->pos) {
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perror(fname);
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exit(1);
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}
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if (fclose(file) != 0) {
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perror(fname);
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exit(1);
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}
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}
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static void write_if_changed(struct buffer *b, const char *fname)
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{
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char *tmp;
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@ -2407,16 +2426,7 @@ static void write_if_changed(struct buffer *b, const char *fname)
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close_write:
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fclose(file);
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write:
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file = fopen(fname, "w");
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if (!file) {
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perror(fname);
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exit(1);
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}
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if (fwrite(b->p, 1, b->pos, file) != b->pos) {
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perror(fname);
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exit(1);
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}
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fclose(file);
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write_buf(b, fname);
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}
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/* parse Module.symvers file. line format:
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@ -2508,7 +2518,7 @@ static void write_dump(const char *fname)
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symbol = symbol->next;
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}
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}
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write_if_changed(&buf, fname);
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write_buf(&buf, fname);
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free(buf.p);
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}
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