Example usages:
/* Simple initcall, don't care when we run. */
initcall(myinitfn, foodriver);
/* Initcall which must run after it */
initcall(myinitfn, bardriver, init_after(foodriver));
/* Initcalls which are part of a subsystem */
initcall(myinitfn, bazdriver_a, init_as_part_of(bazdriver_init));
initcall(myinitfn, bazdriver_b,
init_as_part_of(bazdriver_init),
init_after(bazdriver_a));
/* Initcall which requires a subsystem */
initcall(myinitfn, wuzdriver, init_after(bazdriver_init));
I think we should keep core_init (for mm), and probably let the others
evolve as required. We can move much more to initfuncs now, too.
Questions & feedback welcome...
Rusty.
PS. Yes, it slows down kernel build. But sh is portable and easy.
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/current-dontdiff --minimal linux-2.5.20/include/linux/init.h working-2.5.20-initorder/include/linux/init.h
--- linux-2.5.20/include/linux/init.h Wed Jun 5 11:58:08 2002
+++ working-2.5.20-initorder/include/linux/init.h Fri Jun 7 10:10:19 2002
@@ -1,7 +1,12 @@
#ifndef _LINUX_INIT_H
#define _LINUX_INIT_H
+/* Hacked on by just about everyone. Explicit ordering work by:
+ * Rusty Russell (C) 2002 IBM Corporation */
+
+/* Change this file, make sure you don't break scripts/build-initcalls */
#include <linux/config.h>
+#include <linux/stringify.h>
/* These macros are used to mark some functions or
* initialized data (doesn't apply to uninitialized data)
@@ -48,29 +53,46 @@
typedef int (*initcall_t)(void);
typedef void (*exitcall_t)(void);
-extern initcall_t __initcall_start, __initcall_end;
+#define INITCALL_MAX_NAMELEN 32
+#define INITCALL_MAX_DEPS 3
-/* initcalls are now grouped by functionality into separate
- * subsections. Ordering inside the subsections is determined
- * by link order.
- * For backwards compatability, initcall() puts the call in
- * the device init subsection.
- */
+/* Ensure it's initialized after x */
+#define init_after(x) { .follows = __stringify(x) "-end" }
-#define __define_initcall(level,fn) \
- static initcall_t __initcall_##fn __attribute__ ((unused,__section__ (".initcall" level ".init"))) = fn
+/* Ensure it's initialized before x */
+#define init_before(x) { .preceeds = __stringify(x) "-start" }
-#define core_initcall(fn) __define_initcall("1",fn)
-#define unused_initcall(fn) __define_initcall("2",fn)
-#define arch_initcall(fn) __define_initcall("3",fn)
-#define subsys_initcall(fn) __define_initcall("4",fn)
-#define fs_initcall(fn) __define_initcall("5",fn)
-#define device_initcall(fn) __define_initcall("6",fn)
-#define late_initcall(fn) __define_initcall("7",fn)
+/* This is part of the x subsystem initialization */
+#define init_as_part_of(x) \
+ { .follows = __stringify(x) "-start", .preceeds = __stringify(x) "-end" }
-#define __initcall(fn) device_initcall(fn)
+/* Example usage:
+ initcall(myinit, ppc_extras,
+ init_after(ppc_core),
+ init_as_part_of(arch_init));
+ Do not use a "_init" name except for subsystems (ie. init_as_part_of()).
+*/
+#define initcall(initfn,initname,...) \
+ static inline initcall_t __init_##initname##_test(void) \
+ { return initfn; } \
+ int __init_##initname(void) __attribute__((alias(#initfn))); \
+ static const struct initcall_info initfn##_initcall_info \
+ __attribute__ ((__section__ (".initcalls"))) = \
+ { .name = __stringify(initname), { __VA_ARGS__ } };
-#define __exitcall(fn) \
+struct initcall_order
+{
+ char preceeds[INITCALL_MAX_NAMELEN];
+ char follows[INITCALL_MAX_NAMELEN];
+};
+
+struct initcall_info
+{
+ char name[INITCALL_MAX_NAMELEN];
+ struct initcall_order order[INITCALL_MAX_DEPS];
+};
+
+#define __exitcall(fn) \
static exitcall_t __exitcall_##fn __exit_call = fn
/*
@@ -86,7 +108,6 @@
#define __setup(str, fn) \
static char __setup_str_##fn[] __initdata = str; \
static struct kernel_param __setup_##fn __attribute__((unused)) __initsetup = { __setup_str_##fn, fn }
-
#endif /* __ASSEMBLY__ */
/*
@@ -135,7 +156,6 @@
#define __exit
#define __initdata
#define __exitdata
-#define __initcall(fn)
/* For assembly routines */
#define __INIT
#define __FINIT
@@ -159,14 +179,7 @@
#define __setup(str,func) /* nothing */
-#define core_initcall(fn) module_init(fn)
-#define unused_initcall(fn) module_init(fn)
-#define arch_initcall(fn) module_init(fn)
-#define subsys_initcall(fn) module_init(fn)
-#define fs_initcall(fn) module_init(fn)
-#define device_initcall(fn) module_init(fn)
-#define late_initcall(fn) module_init(fn)
-
+#define initcall(initfn,initname,...) module_init(initfn)
#endif
/* Data marked not to be saved by software_suspend() */
@@ -185,5 +198,21 @@
#define __devexitdata __exitdata
#define __devexit_p(x) 0
#endif
+
+/* This many levels of indirection really required */
+#define ___CAT2(a,b) a##b
+#define __CAT2(a,b) ___CAT2(a,b)
+#define __FAKENAME __CAT2(KBUILD_BASENAME,__LINE__)
+#define __obs_initcall(fn,name,subsys) \
+ initcall(fn,name,init_as_part_of(subsys))
+
+/* Backwards compat macros: deprecated */
+#define core_initcall(fn) __obs_initcall(fn,__FAKENAME,core_init)
+#define arch_initcall(fn) __obs_initcall(fn,__FAKENAME,arch_init)
+#define subsys_initcall(fn) __obs_initcall(fn,__FAKENAME,subsys_init)
+#define fs_initcall(fn) __obs_initcall(fn,__FAKENAME,fs_init)
+#define device_initcall(fn) __obs_initcall(fn,__FAKENAME,device_init)
+#define late_initcall(fn) __obs_initcall(fn,__FAKENAME,late_init)
+#define __initcall(fn) device_initcall(fn)
#endif /* _LINUX_INIT_H */
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/current-dontdiff --minimal linux-2.5.20/Makefile working-2.5.20-initorder/Makefile
--- linux-2.5.20/Makefile Mon Jun 3 12:21:18 2002
+++ working-2.5.20-initorder/Makefile Fri Jun 7 09:44:23 2002
@@ -156,6 +156,7 @@
$(DRIVERS) \
$(NETWORKS) \
--end-group \
+ init/generated-initcalls.o \
-o vmlinux
# set -e makes the rule exit immediately on error
@@ -172,7 +173,10 @@
$(NM) vmlinux | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
endef
-vmlinux: $(CONFIGURATION) $(vmlinux-objs) FORCE
+init/generated-initcalls.c: $(vmlinux-objs) scripts/build-initcalls
+ scripts/build-initcalls $(OBJDUMP) $(vmlinux-objs) >$@
+
+vmlinux: $(CONFIGURATION) $(vmlinux-objs) init/generated-initcalls.o FORCE
$(call if_changed_rule,link_vmlinux)
# The actual objects are generated when descending,
@@ -440,7 +444,7 @@
# files removed with 'make clean'
CLEAN_FILES += \
- kernel/ksyms.lst include/linux/compile.h \
+ init/generated-initcalls.c kernel/ksyms.lst include/linux/compile.h \
vmlinux System.map \
.tmp* \
drivers/char/consolemap_deftbl.c drivers/video/promcon_tbl.c \
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/current-dontdiff --minimal linux-2.5.20/init/main.c working-2.5.20-initorder/init/main.c
--- linux-2.5.20/init/main.c Mon Jun 3 12:21:28 2002
+++ working-2.5.20-initorder/init/main.c Thu Jun 6 15:05:53 2002
@@ -421,19 +421,7 @@
struct task_struct *child_reaper = &init_task;
-static void __init do_initcalls(void)
-{
- initcall_t *call;
-
- call = &__initcall_start;
- do {
- (*call)();
- call++;
- } while (call < &__initcall_end);
-
- /* Make sure there is no pending stuff from the initcall sequence */
- flush_scheduled_tasks();
-}
+extern void do_initcalls(void);
/*
* Ok, the machine is now initialized. None of the devices
@@ -485,6 +473,8 @@
start_context_thread();
do_initcalls();
+ /* Make sure there is no pending stuff from the initcall sequence */
+ flush_scheduled_tasks();
}
extern void prepare_namespace(void);
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/current-dontdiff --minimal linux-2.5.20/kernel/exec_domain.c working-2.5.20-initorder/kernel/exec_domain.c
--- linux-2.5.20/kernel/exec_domain.c Fri Mar 8 14:49:30 2002
+++ working-2.5.20-initorder/kernel/exec_domain.c Fri Jun 7 09:41:16 2002
@@ -281,7 +281,7 @@
return 0;
}
-__initcall(abi_register_sysctl);
+initcall(abi_register_sysctl, exec_domain, init_as_part_of(core_init));
EXPORT_SYMBOL(abi_defhandler_coff);
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/current-dontdiff --minimal linux-2.5.20/kernel/softirq.c working-2.5.20-initorder/kernel/softirq.c
--- linux-2.5.20/kernel/softirq.c Mon Jun 3 12:21:28 2002
+++ working-2.5.20-initorder/kernel/softirq.c Fri Jun 7 09:41:42 2002
@@ -412,4 +412,4 @@
return 0;
}
-__initcall(spawn_ksoftirqd);
+initcall(spawn_ksoftirqd, ksoftirqd, init_as_part_of(core_init));
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/current-dontdiff --minimal linux-2.5.20/mm/highmem.c working-2.5.20-initorder/mm/highmem.c
--- linux-2.5.20/mm/highmem.c Mon Apr 29 16:00:30 2002
+++ working-2.5.20-initorder/mm/highmem.c Fri Jun 7 09:43:34 2002
@@ -220,7 +220,7 @@
return 0;
}
-__initcall(init_emergency_pool);
+initcall(init_emergency_pool, "highmem", init_as_part_of(core_init));
/*
* highmem version, map in to vec
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/current-dontdiff --minimal linux-2.5.20/mm/slab.c working-2.5.20-initorder/mm/slab.c
--- linux-2.5.20/mm/slab.c Mon May 13 12:00:40 2002
+++ working-2.5.20-initorder/mm/slab.c Fri Jun 7 10:07:26 2002
@@ -508,7 +508,7 @@
return 0;
}
-__initcall(kmem_cpucache_init);
+initcall(kmem_cpucache_init, slab, init_as_part_of(core_init));
/* Interface to system's page allocator. No need to hold the cache-lock.
*/
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/current-dontdiff --minimal linux-2.5.20/scripts/build-initcalls working-2.5.20-initorder/scripts/build-initcalls
--- linux-2.5.20/scripts/build-initcalls Thu Jan 1 10:00:00 1970
+++ working-2.5.20-initorder/scripts/build-initcalls Fri Jun 7 10:27:19 2002
@@ -0,0 +1,104 @@
+#! /bin/sh -e
+# Given an objdump, and a list of object files, spit out C code to
+# call all the inits in order.
+
+# Hardcoded section orderings here.
+FIXED="core_init arch_init subsys_init fs_init device_init late_init"
+
+if [ `expr $# \> 1` = 0 ]; then
+ echo Usage: $0 objdump objfile... >&2
+ exit 1
+fi
+
+OBJDUMP="$1"
+shift
+
+# Get the structure sizes.
+INCLUDE_FILE=include/linux/init.h
+NAMELEN=`grep '^#define.*INITCALL_MAX_NAMELEN' $INCLUDE_FILE | cut -d' ' -f3`
+NUMDEPS=`grep '^#define.*INITCALL_MAX_DEPS' $INCLUDE_FILE | cut -d' ' -f3`
+if [ x$NUMDEPS = x ] || [ x$NAMELEN = x ] || [ `expr $NAMELEN % 16` != 0 ];then
+ echo Invalid include file values: "$NAMELEN" and "$NUMDEPS" >&2
+ exit 1
+fi
+# Objdump deals in 16-byte quantities.
+NAMELEN=`expr $NAMELEN / 16`
+
+# I hate mktemp, but tempfile isn't avail on RedHat
+TMPFILE=`mktemp ${TMPDIR:-/tmp/}build-initcalls.XXXXXX`
+TMPFILE2=`mktemp ${TMPDIR:-/tmp/}build-initcalls2.XXXXXX`
+REGEX=`mktemp ${TMPDIR:-/tmp/}build-real.XXXXXX`
+trap "rm -f $TMPFILE $TMPFILE2 $NAMES" 0
+
+echo -n "s/\(" > $REGEX
+
+STATE=IN_NAME
+HEXABYTES=0
+FULLSTRING=""
+"$OBJDUMP" --section=.initcalls --full-contents "$@" |
+grep '^ *[0-9a-f][0-9a-f][0-9a-f][0-9a-f]' |
+while read POS HEX1 HEX2 HEX3 HEX4 STRING; do
+ # objdump uses . for non-printable, and we don't use real ones.
+ FULLSTRING="$FULLSTRING`echo -n \"$STRING\" | tr -d .`"
+ HEXABYTES=`expr $HEXABYTES + 1`
+ if [ $HEXABYTES = $NAMELEN ]; then
+ case $STATE in
+ IN_NAME)
+ NAME="$FULLSTRING"
+ # Mentioned as a name: actual routine, not subsystem.
+ [ -z "$NAME" ] || echo -n "$NAME\|" >> $REGEX
+ STATE=IN_INITCALL_PRECEEDS
+ INITCALL_NUM=0
+ ;;
+ IN_INITCALL_PRECEEDS)
+ [ -z "$FULLSTRING" ] || echo "$NAME"-start "$FULLSTRING"
+ STATE=IN_INITCALL_FOLLOWS
+ ;;
+ IN_INITCALL_FOLLOWS)
+ [ -z "$FULLSTRING" ] || echo "$FULLSTRING" "$NAME"-end
+ INITCALL_NUM=`expr $INITCALL_NUM + 1`
+ if [ $INITCALL_NUM = $NUMDEPS ]; then
+ STATE=IN_NAME
+ else
+ STATE=IN_INITCALL_PRECEEDS
+ fi
+ ;;
+ esac
+ HEXABYTES=0
+ FULLSTRING=""
+ fi
+done > $TMPFILE
+
+# For everything which is an actual routine name, -start and -end are
+# the same. Use regex to strip them.
+echo "INVALID-NAME\)-\(start\|end\)/\1/g" >> $REGEX
+sed "`cat $REGEX`" < $TMPFILE > $TMPFILE2
+
+# Add in fixed orderings.
+prev_fixed=""
+for fixed in $FIXED; do
+ [ x"$prev_fixed" = x ] || echo $prev_fixed-end $fixed-start
+ echo $fixed-start $fixed-end
+ prev_fixed=$fixed
+done >> $TMPFILE2
+
+# Do the sort.
+tsort < $TMPFILE2 > $TMPFILE
+
+# Generate output
+echo "/* Auto-generated by build-initcalls: DO NOT EDIT. */"
+echo "#include <linux/init.h>"
+echo ""
+echo "void __init do_initcalls(void)"
+echo "{"
+while read VALUE; do
+ case $VALUE in
+ *-end|*-start)
+ echo "/* $VALUE */"
+ ;;
+ *)
+ echo " { extern int __init_$VALUE(void); __init_$VALUE(); }"
+ ;;
+ esac
+done < $TMPFILE
+echo "}"
-- Anyone who quotes me in their sig is an idiot. -- Rusty Russell. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/