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ftrace: powerpc clean ups

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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>
This commit is contained in:
Steven Rostedt 2008-05-22 14:31:07 -04:00 committed by Thomas Gleixner
parent 41bc8144d0
commit ccbfac2923
6 changed files with 20 additions and 20 deletions
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11
arch/powerpc/kernel/entry_32.S
View File

@ -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)

8
arch/powerpc/kernel/ftrace.c
View File

@ -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

5
arch/powerpc/kernel/ppc_ksyms.c
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@ -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);

5
arch/powerpc/kernel/setup_32.c
View File

@ -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;

5
arch/powerpc/kernel/setup_64.c
View File

@ -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.

6
include/asm-powerpc/ftrace.h Normal file
View File

@ -0,0 +1,6 @@
#ifndef _ASM_POWERPC_FTRACE
#define _ASM_POWERPC_FTRACE
extern void _mcount(void);
#endif