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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>
This commit is contained in:
Masahiro Yamada 2020-06-01 14:57:12 +09:00
parent 269a535ca9
commit 436b2ac603
2 changed files with 37 additions and 15 deletions
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20
scripts/Makefile.modpost
View File

@ -90,7 +90,7 @@ endif
# modpost options for modules (both in-kernel and external)
MODPOST += \
$(addprefix -i ,$(input-symdump)) \
$(addprefix -i ,$(wildcard $(input-symdump))) \
$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)
# 'make -i -k' ignores compile errors, and builds as many modules as possible.
@ -98,13 +98,18 @@ ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
MODPOST += -n
endif
$(input-symdump):
@:
# Read out modules.order to pass in modpost.
# Otherwise, allmodconfig would fail with "Argument list too long".
quiet_cmd_modpost = MODPOST $@
cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST) -T -
cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T -
$(output-symdump): FORCE
$(call cmd,modpost)
$(output-symdump): $(MODORDER) $(input-symdump) FORCE
$(call if_changed,modpost)
targets += $(output-symdump)
__modpost: $(output-symdump)
ifneq ($(KBUILD_MODPOST_NOFINAL),1)
@ -114,6 +119,13 @@ endif
PHONY += FORCE
FORCE:
existing-targets := $(wildcard $(sort $(targets)))
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
PHONY += FORCE
FORCE:
endif
.PHONY: $(PHONY)

32
scripts/mod/modpost.c
View File

@ -2375,6 +2375,25 @@ static void add_srcversion(struct buffer *b, struct module *mod)
}
}
static void write_buf(struct buffer *b, const char *fname)
{
FILE *file;
file = fopen(fname, "w");
if (!file) {
perror(fname);
exit(1);
}
if (fwrite(b->p, 1, b->pos, file) != b->pos) {
perror(fname);
exit(1);
}
if (fclose(file) != 0) {
perror(fname);
exit(1);
}
}
static void write_if_changed(struct buffer *b, const char *fname)
{
char *tmp;
@ -2407,16 +2426,7 @@ static void write_if_changed(struct buffer *b, const char *fname)
close_write:
fclose(file);
write:
file = fopen(fname, "w");
if (!file) {
perror(fname);
exit(1);
}
if (fwrite(b->p, 1, b->pos, file) != b->pos) {
perror(fname);
exit(1);
}
fclose(file);
write_buf(b, fname);
}
/* parse Module.symvers file. line format:
@ -2508,7 +2518,7 @@ static void write_dump(const char *fname)
symbol = symbol->next;
}
}
write_if_changed(&buf, fname);
write_buf(&buf, fname);
free(buf.p);
}