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authorSteven Rostedt <rostedt@goodmis.org>2008-08-14 22:47:19 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-14 10:35:12 +0200
commitfed1939c64d2288938fdc1c367d49082da65e195 (patch)
treea4592352d28efcfe82379c71d061b9127e49a115 /include/linux/init.h
parent28614889bcb2558a47d02d52394b7fd9795a9547 (diff)
downloadop-kernel-dev-fed1939c64d2288938fdc1c367d49082da65e195.zip
op-kernel-dev-fed1939c64d2288938fdc1c367d49082da65e195.tar.gz
ftrace: remove old pointers to mcount
When a mcount pointer is recorded into a table, it is used to add or remove calls to mcount (replacing them with nops). If the code is removed via removing a module, the pointers still exist. At modifying the code a check is always made to make sure the code being replaced is the code expected. In-other-words, the code being replaced is compared to what it is expected to be before being replaced. There is a very small chance that the code being replaced just happens to look like code that calls mcount (very small since the call to mcount is relative). To remove this chance, this patch adds ftrace_release to allow module unloading to remove the pointers to mcount within the module. Another change for init calls is made to not trace calls marked with __init. The tracing can not be started until after init is done anyway. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/init.h')
-rw-r--r--include/linux/init.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/init.h b/include/linux/init.h
index 93538b6..27f61f6 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -40,7 +40,7 @@
/* These are for everybody (although not all archs will actually
discard it in modules) */
-#define __init __section(.init.text) __cold
+#define __init __section(.init.text) __cold notrace
#define __initdata __section(.init.data)
#define __initconst __section(.init.rodata)
#define __exitdata __section(.exit.data)
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