time: Move timeconst.h into include/generated

[deliverable/linux.git] / Kbuild

diff --git a/Kbuild b/Kbuild
index ab8ded92e870f55290d4d8283e4cbb1b849f8a58..df99a5f53beb880482871e99453bf04ef2f0fb06 100644 (file)
--- a/Kbuild
+++ b/Kbuild
@@ -2,8 +2,9 @@
 # Kbuild for top-level directory of the kernel
 # This file takes care of the following:
 # 1) Generate bounds.h
-# 2) Generate asm-offsets.h (may need bounds.h)
-# 3) Check for missing system calls
+# 2) Generate timeconst.h
+# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
+# 4) Check for missing system calls
 
 # Default sed regexp - multiline due to syntax constraints
 define sed-y
@@ -13,8 +14,9 @@ define sed-y
        s:->::; p;}"
 endef
 
-quiet_cmd_offsets = GEN     $@
-define cmd_offsets
+# Use filechk to avoid rebuilds when a header changes, but the resulting file
+# does not
+define filechk_offsets
        (set -e; \
         echo "#ifndef $2"; \
         echo "#define $2"; \
@@ -24,9 +26,9 @@ define cmd_offsets
         echo " * This file was generated by Kbuild"; \
         echo " */"; \
         echo ""; \
-        sed -ne $(sed-y) $<; \
+        sed -ne $(sed-y); \
         echo ""; \
-        echo "#endif" ) > $@
+        echo "#endif" )
 endef
 
 #####
@@ -35,38 +37,55 @@ endef
 bounds-file := include/generated/bounds.h
 
 always  := $(bounds-file)
-targets := $(bounds-file) kernel/bounds.s
+targets := kernel/bounds.s
 
 # We use internal kbuild rules to avoid the "is up to date" message from make
 kernel/bounds.s: kernel/bounds.c FORCE
        $(Q)mkdir -p $(dir $@)
        $(call if_changed_dep,cc_s_c)
 
-$(obj)/$(bounds-file): kernel/bounds.s Kbuild
-       $(Q)mkdir -p $(dir $@)
-       $(call cmd,offsets,__LINUX_BOUNDS_H__)
+$(obj)/$(bounds-file): kernel/bounds.s FORCE
+       $(call filechk,offsets,__LINUX_BOUNDS_H__)
+
+#####
+# 2) Generate timeconst.h
+
+timeconst-file := include/generated/timeconst.h
+
+#always  += $(timeconst-file)
+targets += $(timeconst-file)
+
+quiet_cmd_gentimeconst = GEN     $@
+define cmd_gentimeconst
+       (echo $(CONFIG_HZ) | bc -q $< ) > $@
+endef
+define filechk_gentimeconst
+       (echo $(CONFIG_HZ) | bc -q $< )
+endef
+
+$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
+       $(call filechk,gentimeconst)
 
 #####
-# 2) Generate asm-offsets.h
+# 3) Generate asm-offsets.h
 #
 
 offsets-file := include/generated/asm-offsets.h
 
 always  += $(offsets-file)
-targets += $(offsets-file)
 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
 
 # We use internal kbuild rules to avoid the "is up to date" message from make
 arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
-                                      $(obj)/$(bounds-file) FORCE
+                                      $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
        $(Q)mkdir -p $(dir $@)
        $(call if_changed_dep,cc_s_c)
 
-$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
-       $(call cmd,offsets,__ASM_OFFSETS_H__)
+$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
+       $(call filechk,offsets,__ASM_OFFSETS_H__)
 
 #####
-# 3) Check for missing system calls
+# 4) Check for missing system calls
 #
 
 always += missing-syscalls
@@ -78,5 +97,5 @@ quiet_cmd_syscalls = CALL    $<
 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
        $(call cmd,syscalls)
 
-# Keep these two files during make clean
-no-clean-files := $(bounds-file) $(offsets-file)
+# Keep these three files during make clean
+no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)