Support a "checking" mode for kernel builds, that runs a

user-supplied source checker on all C files before compiling
them.

I'll release the actual checker once I've cleaned it up a
bit more (yay, all the copyright paperwork completed!)

Makefile

@@ -90,7 +90,7 @@ ifneq ($(filter all,$(MAKECMDGOALS)),)
   KBUILD_MODULES := 1
 endif
 
-export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
+export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE KBUILD_CHECKSRC
 
 # Beautify output
 # ---------------------------------------------------------------------------
@@ -118,6 +118,16 @@ ifndef KBUILD_VERBOSE
   KBUILD_VERBOSE = 1
 endif
 
+ifdef C
+  ifeq ("$(origin C)", "command line")
+    KBUILD_CHECKSRC = $(C)
+  endif
+endif
+ifndef KBUILD_CHECKSRC
+  KBUILD_CHECKSRC = 0
+endif
+
+
 MAKEFLAGS += --no-print-directory
 
 # For maximum performance (+ possibly random breakage, uncomment
@@ -172,6 +182,7 @@ GENKSYMS	= scripts/genksyms/genksyms
 DEPMOD		= /sbin/depmod
 KALLSYMS	= scripts/kallsyms
 PERL		= perl
+CHECK		= /home/torvalds/parser/check
 MODFLAGS	= -DMODULE
 CFLAGS_MODULE   = $(MODFLAGS)
 AFLAGS_MODULE   = $(MODFLAGS)
@@ -189,7 +200,7 @@ AFLAGS		:= -D__ASSEMBLY__ $(CPPFLAGS)
 export	VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
 	CONFIG_SHELL TOPDIR HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
-	HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE
+	HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
 
 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 

scripts/Makefile.build

@@ -66,6 +66,12 @@ __build: $(if $(KBUILD_BUILTIN),$(O_TARGET) $(L_TARGET) $(extra-y)) \
 	 $(subdir-ym) $(always)
 	@:
 
+# Linus's kernel sanity checking tool
+ifneq ($(KBUILD_CHECKSRC),0)
+quiet_cmd_checksrc = CHECK   $<
+      cmd_checksrc = $(CHECK) $(CFLAGS) $< ;
+endif
+ 
 # Module versioning
 # ---------------------------------------------------------------------------
 
@@ -91,6 +97,8 @@ quiet_cmd_vcc_o_c = CC $(quiet_modtag)  $@
 cmd_vcc_o_c       = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
 
 define rule_vcc_o_c
+	$(if $($(quiet)cmd_checksrc),echo '  $($(quiet)cmd_checksrc)';)	      \
+	$(cmd_checksrc)							      \
 	$(if $($(quiet)cmd_vcc_o_c),echo '  $($(quiet)cmd_vcc_o_c)';)	      \
 	$(cmd_vcc_o_c);							      \
 									      \
@@ -158,6 +166,15 @@ cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
 
 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
 cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
+define rule_cc_o_c
+	$(if $($(quiet)cmd_checksrc),echo '  $($(quiet)cmd_checksrc)';)	      \
+	$(cmd_checksrc)							      \
+	$(if $($(quiet)cmd_cc_o_c),echo '  $($(quiet)cmd_cc_o_c)';)	      \
+	$(cmd_cc_o_c);							      \
+	scripts/fixdep $(depfile) $@ '$(cmd_cc_o_c)' > $(@D)/.$(@F).tmp;      \
+	rm -f $(depfile);						      \
+	mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
+endef
 
 # Built-in and composite module parts
 
@@ -165,7 +182,7 @@ cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 ifdef CONFIG_MODVERSIONS
 	$(call if_changed_rule,vcc_o_c)
 else
-	$(call if_changed_dep,cc_o_c)
+	$(call if_changed_rule,cc_o_c)
 endif
 
 # Single-part modules are special since we need to mark them in $(MODVERDIR)
@@ -174,7 +191,7 @@ $(single-used-m): %.o: %.c FORCE
 ifdef CONFIG_MODVERSIONS
 	$(call if_changed_rule,vcc_o_c)
 else
-	$(call if_changed_dep,cc_o_c)
+	$(call if_changed_rule,cc_o_c)
 endif
 	$(touch-module)