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authorMichal Marek2015-03-11 05:01:01 -0500
committerMichal Marek2015-03-24 11:37:25 -0500
commit70a4fd6c56d0f581a63dffd8c31d180e96ecf6a6 (patch)
tree1a1640ae201a1d8faa2fd740a027cc8d699c28fe /Kbuild
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
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kbuild: Don't reset timestamps in include/generated if not needed
Use filechk to generate asm-offsets.h and bounds.h. Based on a patch by Valdis Kletnieks. Reported-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu> Acked-By: Valdis Kletnieks <Valdis.Kletnieks@vt.edu> Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'Kbuild')
-rw-r--r--Kbuild18
1 files changed, 9 insertions, 9 deletions
diff --git a/Kbuild b/Kbuild
index ab8ded92e870..96d062906c05 100644
--- a/Kbuild
+++ b/Kbuild
@@ -13,8 +13,9 @@ define sed-y
13 s:->::; p;}" 13 s:->::; p;}"
14endef 14endef
15 15
16quiet_cmd_offsets = GEN $@ 16# Use filechk to avoid rebuilds when a header changes, but the resulting file
17define cmd_offsets 17# does not
18define filechk_offsets
18 (set -e; \ 19 (set -e; \
19 echo "#ifndef $2"; \ 20 echo "#ifndef $2"; \
20 echo "#define $2"; \ 21 echo "#define $2"; \
@@ -24,9 +25,9 @@ define cmd_offsets
24 echo " * This file was generated by Kbuild"; \ 25 echo " * This file was generated by Kbuild"; \
25 echo " */"; \ 26 echo " */"; \
26 echo ""; \ 27 echo ""; \
27 sed -ne $(sed-y) $<; \ 28 sed -ne $(sed-y); \
28 echo ""; \ 29 echo ""; \
29 echo "#endif" ) > $@ 30 echo "#endif" )
30endef 31endef
31 32
32##### 33#####
@@ -42,9 +43,8 @@ kernel/bounds.s: kernel/bounds.c FORCE
42 $(Q)mkdir -p $(dir $@) 43 $(Q)mkdir -p $(dir $@)
43 $(call if_changed_dep,cc_s_c) 44 $(call if_changed_dep,cc_s_c)
44 45
45$(obj)/$(bounds-file): kernel/bounds.s Kbuild 46$(obj)/$(bounds-file): kernel/bounds.s FORCE
46 $(Q)mkdir -p $(dir $@) 47 $(call filechk,offsets,__LINUX_BOUNDS_H__)
47 $(call cmd,offsets,__LINUX_BOUNDS_H__)
48 48
49##### 49#####
50# 2) Generate asm-offsets.h 50# 2) Generate asm-offsets.h
@@ -62,8 +62,8 @@ arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
62 $(Q)mkdir -p $(dir $@) 62 $(Q)mkdir -p $(dir $@)
63 $(call if_changed_dep,cc_s_c) 63 $(call if_changed_dep,cc_s_c)
64 64
65$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild 65$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
66 $(call cmd,offsets,__ASM_OFFSETS_H__) 66 $(call filechk,offsets,__ASM_OFFSETS_H__)
67 67
68##### 68#####
69# 3) Check for missing system calls 69# 3) Check for missing system calls