This is waht make C=1 is for. If this is broken then we should
fix it.
Just trying it out:
$ make C=1 kernel/sched.o
CHECK kernel/sched.c
kernel/sched_fair.c:37:14: warning: symbol 'sysctl_sched_latency' was not declar ed. Should it be static?
kernel/sched_fair.c:43:14: warning: symbol 'sysctl_sched_min_granularity' was no t declared. Should it be static?
kernel/sched_fair.c:72:14: warning: symbol 'sysctl_sched_wakeup_granularity' was not declared. Should it be static?
...
CC kernel/sched.o
So make C=1 works as intended and let you run sparse on the files
that are built - and only those.
Already present.
That would then be on a directory basis.
You can do:
diff --git a/kernel/Makefile b/kernel/Makefile
index 1c9938a..1ba00aa 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -2,6 +2,7 @@
# Makefile for the linux kernel.
#
+KBUILD_CHECKSRC=1
obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
exit.o itimer.o time.o softirq.o resource.o \
sysctl.o capability.o ptrace.o timer.o user.o \
already today.
It applies recursively so we will then run sparse on kernel/time/*.o too.
There is no easy way to cover all of arch/x86/*.o as the files are distributed
in several Makefiles and there is no common one.
This could be a simple:
ifdef CONFIG_CHECK_IS_ERROR
CHECKFLAGS += -Werror
endif
And teach sparse about -Werror
For each Makefile (does not apply recursively):
ccflags-$(CONFIG_PROMOTE_WARNINGS_TO_ERROR) += -Werror
When I get around to it:
ccflags-sched.o-$(CONFIG_PROMOTE_WARNINGS_TO_ERROR) += -Werror
Sam
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