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authorSteven Rostedt <srostedt@redhat.com>2008-11-14 16:21:19 -0800
committerIngo Molnar <mingo@elte.hu>2008-11-16 07:36:02 +0100
commit31e889098a80ceb3e9e3c555d522b2686a6663c6 (patch)
tree2acb73507de4191d4a9aa5ccf08fa24e7044c89e /arch/x86/include/asm/ftrace.h
parentd51ad7ac48f991c4a8834485727efa99a691cb87 (diff)
downloadblackbird-op-linux-31e889098a80ceb3e9e3c555d522b2686a6663c6.tar.gz
blackbird-op-linux-31e889098a80ceb3e9e3c555d522b2686a6663c6.zip
ftrace: pass module struct to arch dynamic ftrace functions
Impact: allow archs more flexibility on dynamic ftrace implementations Dynamic ftrace has largly been developed on x86. Since x86 does not have the same limitations as other architectures, the ftrace interaction between the generic code and the architecture specific code was not flexible enough to handle some of the issues that other architectures have. Most notably, module trampolines. Due to the limited branch distance that archs make in calling kernel core code from modules, the module load code must create a trampoline to jump to what will make the larger jump into core kernel code. The problem arises when this happens to a call to mcount. Ftrace checks all code before modifying it and makes sure the current code is what it expects. Right now, there is not enough information to handle modifying module trampolines. This patch changes the API between generic dynamic ftrace code and the arch dependent code. There is now two functions for modifying code: ftrace_make_nop(mod, rec, addr) - convert the code at rec->ip into a nop, where the original text is calling addr. (mod is the module struct if called by module init) ftrace_make_caller(rec, addr) - convert the code rec->ip that should be a nop into a caller to addr. The record "rec" now has a new field called "arch" where the architecture can add any special attributes to each call site record. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/ftrace.h')
-rw-r--r--arch/x86/include/asm/ftrace.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index 9b6a1fa19e70..2bb43b433e07 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -17,6 +17,14 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
*/
return addr - 1;
}
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+
+struct dyn_arch_ftrace {
+ /* No extra data needed for x86 */
+};
+
+#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */
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