Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke...

[pandora-kernel.git] / arch / x86 / kernel / ftrace.c

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index cd37469..3afb33f 100644 (file)
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -257,14 +257,9 @@ do_ftrace_mod_code(unsigned long ip, void *new_code)
        return mod_code_status;
 }
 
-
-
-
-static unsigned char ftrace_nop[MCOUNT_INSN_SIZE];
-
 static unsigned char *ftrace_nop_replace(void)
 {
-       return ftrace_nop;
+       return ideal_nop5;
 }
 
 static int
@@ -338,62 +333,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
 
 int __init ftrace_dyn_arch_init(void *data)
 {
-       extern const unsigned char ftrace_test_p6nop[];
-       extern const unsigned char ftrace_test_nop5[];
-       extern const unsigned char ftrace_test_jmp[];
-       int faulted = 0;
-
-       /*
-        * There is no good nop for all x86 archs.
-        * We will default to using the P6_NOP5, but first we
-        * will test to make sure that the nop will actually
-        * work on this CPU. If it faults, we will then
-        * go to a lesser efficient 5 byte nop. If that fails
-        * we then just use a jmp as our nop. This isn't the most
-        * efficient nop, but we can not use a multi part nop
-        * since we would then risk being preempted in the middle
-        * of that nop, and if we enabled tracing then, it might
-        * cause a system crash.
-        *
-        * TODO: check the cpuid to determine the best nop.
-        */
-       asm volatile (
-               "ftrace_test_jmp:"
-               "jmp ftrace_test_p6nop\n"
-               "nop\n"
-               "nop\n"
-               "nop\n"  /* 2 byte jmp + 3 bytes */
-               "ftrace_test_p6nop:"
-               P6_NOP5
-               "jmp 1f\n"
-               "ftrace_test_nop5:"
-               ".byte 0x66,0x66,0x66,0x66,0x90\n"
-               "1:"
-               ".section .fixup, \"ax\"\n"
-               "2:     movl $1, %0\n"
-               "       jmp ftrace_test_nop5\n"
-               "3:     movl $2, %0\n"
-               "       jmp 1b\n"
-               ".previous\n"
-               _ASM_EXTABLE(ftrace_test_p6nop, 2b)
-               _ASM_EXTABLE(ftrace_test_nop5, 3b)
-               : "=r"(faulted) : "0" (faulted));
-
-       switch (faulted) {
-       case 0:
-               pr_info("converting mcount calls to 0f 1f 44 00 00\n");
-               memcpy(ftrace_nop, ftrace_test_p6nop, MCOUNT_INSN_SIZE);
-               break;
-       case 1:
-               pr_info("converting mcount calls to 66 66 66 66 90\n");
-               memcpy(ftrace_nop, ftrace_test_nop5, MCOUNT_INSN_SIZE);
-               break;
-       case 2:
-               pr_info("converting mcount calls to jmp . + 5\n");
-               memcpy(ftrace_nop, ftrace_test_jmp, MCOUNT_INSN_SIZE);
-               break;
-       }
-
        /* The return code is retured via data */
        *(unsigned long *)data = 0;