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authorSteven Rostedt <rostedt@goodmis.org>2008-05-22 14:31:07 -0400
committerThomas Gleixner <tglx@linutronix.de>2008-05-26 22:51:57 +0200
commitccbfac2923c9febaeaf07a50054027a92b502718 (patch)
tree0ed9e86b823ef0b55023a5428b3799ecfe79ea78 /arch
parent41bc8144d02028133bcd1d545023c6f49e8b2411 (diff)
downloadop-kernel-dev-ccbfac2923c9febaeaf07a50054027a92b502718.zip
op-kernel-dev-ccbfac2923c9febaeaf07a50054027a92b502718.tar.gz
ftrace: powerpc clean ups
This patch cleans up the ftrace code in PowerPC based on the comments from Michael Ellerman. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Cc: Michael Ellerman <michael@ellerman.id.au> Cc: proski@gnu.org Cc: a.p.zijlstra@chello.nl Cc: Pekka Paalanen <pq@iki.fi> Cc: Steven Rostedt <srostedt@redhat.com> Cc: linuxppc-dev@ozlabs.org Cc: Soeren Sandmann Pedersen <sandmann@redhat.com> Cc: paulus@samba.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/entry_32.S11
-rw-r--r--arch/powerpc/kernel/ftrace.c8
-rw-r--r--arch/powerpc/kernel/ppc_ksyms.c5
-rw-r--r--arch/powerpc/kernel/setup_32.c5
-rw-r--r--arch/powerpc/kernel/setup_64.c5
5 files changed, 14 insertions, 20 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 0e62218..3b1dd29 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -1129,18 +1129,11 @@ _GLOBAL(_mcount)
stw r5, 8(r1)
LOAD_REG_ADDR(r5, ftrace_trace_function)
-#if 0
- mtctr r3
- mr r1, r5
- bctrl
-#endif
lwz r5,0(r5)
-#if 1
+
mtctr r5
bctrl
-#else
- bl ftrace_stub
-#endif
+
nop
lwz r6, 8(r1)
diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index 5a4993f..69ed412 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -51,10 +51,16 @@ notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
{
static unsigned int op;
+ /*
+ * It would be nice to just use create_function_call, but that will
+ * update the code itself. Here we need to just return the
+ * instruction that is going to be modified, without modifying the
+ * code.
+ */
addr = GET_ADDR(addr);
/* Set to "bl addr" */
- op = 0x48000001 | (ftrace_calc_offset(ip, addr) & 0x03fffffe);
+ op = 0x48000001 | (ftrace_calc_offset(ip, addr) & 0x03fffffc);
/*
* No locking needed, this must be called via kstop_machine
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index cf6b5a7..4300db5 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -43,6 +43,7 @@
#include <asm/div64.h>
#include <asm/signal.h>
#include <asm/dcr.h>
+#include <asm/ftrace.h>
#ifdef CONFIG_PPC32
extern void transfer_to_handler(void);
@@ -68,6 +69,10 @@ EXPORT_SYMBOL(single_step_exception);
EXPORT_SYMBOL(sys_sigreturn);
#endif
+#ifdef CONFIG_FTRACE
+EXPORT_SYMBOL(_mcount);
+#endif
+
EXPORT_SYMBOL(strcpy);
EXPORT_SYMBOL(strncpy);
EXPORT_SYMBOL(strcat);
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 22f8e2b..19e8fcb 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -47,11 +47,6 @@
#include <asm/kgdb.h>
#endif
-#ifdef CONFIG_FTRACE
-extern void _mcount(void);
-EXPORT_SYMBOL(_mcount);
-#endif
-
extern void bootx_init(unsigned long r4, unsigned long phys);
int boot_cpuid;
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 277bf18..098fd96 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -85,11 +85,6 @@ struct ppc64_caches ppc64_caches = {
};
EXPORT_SYMBOL_GPL(ppc64_caches);
-#ifdef CONFIG_FTRACE
-extern void _mcount(void);
-EXPORT_SYMBOL(_mcount);
-#endif
-
/*
* These are used in binfmt_elf.c to put aux entries on the stack
* for each elf executable being started.
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