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authorEduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>2008-07-25 22:45:11 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 15:00:04 -0400
commitc2147a5092cfe13dbf3210e54e8a622015edeecc (patch)
treee34e0daee3cc0b19914a27d6f7f284b1fc22aa93 /include
parent89081d17f7bb81d89fa1aa9b70f821c5cf4d39e9 (diff)
Better interface for hooking early initcalls
Added early initcall (pre-SMP) support, using an identical interface to that of regular initcalls. Functions called from do_pre_smp_initcalls() could be converted to use this cleaner interface. This is required by CPU hotplug, because early users have to register notifiers before going SMP. One such CPU hotplug user is the relay interface with buffer-only channels, which needs to register such a notifier, to be usable in early code. This in turn is used by kmemtrace. Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Cc: Tom Zanussi <tzanussi@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-generic/vmlinux.lds.h2
-rw-r--r--include/linux/init.h7
2 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 729f6b0a60e9..9cd44b162ba1 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -359,6 +359,8 @@
359 } 359 }
360 360
361#define INITCALLS \ 361#define INITCALLS \
362 *(.initcallearly.init) \
363 __early_initcall_end = .; \
362 *(.initcall0.init) \ 364 *(.initcall0.init) \
363 *(.initcall0s.init) \ 365 *(.initcall0s.init) \
364 *(.initcall1.init) \ 366 *(.initcall1.init) \
diff --git a/include/linux/init.h b/include/linux/init.h
index 42ae95411a93..11b84e106053 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -170,6 +170,13 @@ extern void (*late_time_init)(void);
170 __attribute__((__section__(".initcall" level ".init"))) = fn 170 __attribute__((__section__(".initcall" level ".init"))) = fn
171 171
172/* 172/*
173 * Early initcalls run before initializing SMP.
174 *
175 * Only for built-in code, not modules.
176 */
177#define early_initcall(fn) __define_initcall("early",fn,early)
178
179/*
173 * A "pure" initcall has no dependencies on anything else, and purely 180 * A "pure" initcall has no dependencies on anything else, and purely
174 * initializes variables that couldn't be statically initialized. 181 * initializes variables that couldn't be statically initialized.
175 * 182 *