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x86, kgdb, init: Add early and late debug states

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The kernel debugger can operate well before mm_init(), but the x86
hardware breakpoint code which uses the perf api requires that the
kernel allocators are initialized.

This means the kernel debug core needs to provide an optional arch
specific call back to allow the initialization functions to run after
the kernel has been further initialized.

The kdb shell already had a similar restriction with an early
initialization and late initialization.  The kdb_init() was moved into
the debug core's version of the late init which is called
dbg_late_init();

CC: [email protected]
Signed-off-by: Jason Wessel <[email protected]>
This commit is contained in:
Jason Wessel 2010-05-20 21:04:29 -05:00
commit 0b4b3827db
4 changed files with 42 additions and 9 deletions
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4
init/main.c
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@ -62,7 +62,7 @@
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/idr.h>
#include <linux/kdb.h>
#include <linux/kgdb.h>
#include <linux/ftrace.h>
#include <linux/async.h>
#include <linux/kmemcheck.h>
@ -676,7 +676,7 @@ asmlinkage void __init start_kernel(void)
buffer_init();
key_init();
security_init();
kdb_init(KDB_INIT_FULL);
dbg_late_init();
vfs_caches_init(totalram_pages);
signals_init();
/* rootfs populating might need page-writeback */