4 files changed, 26 insertions, 100 deletions

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index c097e7d607c6..7d52e9da5e0c 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1185,17 +1185,14 @@ END(ftrace_graph_caller)
 
 .globl return_to_handler
 return_to_handler:
-        pushl $0
         pushl %eax
-        pushl %ecx
         pushl %edx
         movl %ebp, %eax
         call ftrace_return_to_handler
-        movl %eax, 0xc(%esp)
+        movl %eax, %ecx
         popl %edx
-        popl %ecx
         popl %eax
-        ret
+        jmp *%ecx
 #endif
 
 .section .rodata,"a"
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index b5c061f8f358..bd5bbddddf91 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -155,11 +155,11 @@ GLOBAL(return_to_handler)
 
         call ftrace_return_to_handler
 
-        movq %rax, 16(%rsp)
+        movq %rax, %rdi
         movq 8(%rsp), %rdx
         movq (%rsp), %rax
-        addq $16, %rsp
-        retq
+        addq $24, %rsp
+        jmp *%rdi
 #endif
 
 
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 9dbb527e1652..5a1b9758fd62 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -9,6 +9,8 @@
  * the dangers of modifying code on the run.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/spinlock.h>
 #include <linux/hardirq.h>
 #include <linux/uaccess.h>
@@ -336,15 +338,15 @@ int __init ftrace_dyn_arch_init(void *data)
 
         switch (faulted) {
         case 0:
-                pr_info("ftrace: converting mcount calls to 0f 1f 44 00 00\n");
+                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("ftrace: converting mcount calls to 66 66 66 66 90\n");
+                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("ftrace: converting mcount calls to jmp . + 5\n");
+                pr_info("converting mcount calls to jmp . + 5\n");
                 memcpy(ftrace_nop, ftrace_test_jmp, MCOUNT_INSN_SIZE);
                 break;
         }
@@ -468,82 +470,10 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
 
 #ifdef CONFIG_FTRACE_SYSCALLS
 
-extern unsigned long __start_syscalls_metadata[];
-extern unsigned long __stop_syscalls_metadata[];
 extern unsigned long *sys_call_table;
 
-static struct syscall_metadata **syscalls_metadata;
-
-static struct syscall_metadata *find_syscall_meta(unsigned long *syscall)
-{
-        struct syscall_metadata *start;
-        struct syscall_metadata *stop;
-        char str[KSYM_SYMBOL_LEN];
-
-
-        start = (struct syscall_metadata *)__start_syscalls_metadata;
-        stop = (struct syscall_metadata *)__stop_syscalls_metadata;
-        kallsyms_lookup((unsigned long) syscall, NULL, NULL, NULL, str);
-
-        for ( ; start < stop; start++) {
-                if (start->name && !strcmp(start->name, str))
-                        return start;
-        }
-        return NULL;
-}
-
-struct syscall_metadata *syscall_nr_to_meta(int nr)
-{
-        if (!syscalls_metadata || nr >= NR_syscalls || nr < 0)
-                return NULL;
-
-        return syscalls_metadata[nr];
-}
-
-int syscall_name_to_nr(char *name)
+unsigned long __init arch_syscall_addr(int nr)
 {
-        int i;
-
-        if (!syscalls_metadata)
-                return -1;
-
-        for (i = 0; i < NR_syscalls; i++) {
-                if (syscalls_metadata[i]) {
-                        if (!strcmp(syscalls_metadata[i]->name, name))
-                                return i;
-                }
-        }
-        return -1;
-}
-
-void set_syscall_enter_id(int num, int id)
-{
-        syscalls_metadata[num]->enter_id = id;
-}
-
-void set_syscall_exit_id(int num, int id)
-{
-        syscalls_metadata[num]->exit_id = id;
-}
-
-static int __init arch_init_ftrace_syscalls(void)
-{
-        int i;
-        struct syscall_metadata *meta;
-        unsigned long **psys_syscall_table = &sys_call_table;
-
-        syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) *
-                                        NR_syscalls, GFP_KERNEL);
-        if (!syscalls_metadata) {
-                WARN_ON(1);
-                return -ENOMEM;
-        }
-
-        for (i = 0; i < NR_syscalls; i++) {
-                meta = find_syscall_meta(psys_syscall_table[i]);
-                syscalls_metadata[i] = meta;
-        }
-        return 0;
+        return (unsigned long)(&sys_call_table)[nr];
 }
-arch_initcall(arch_init_ftrace_syscalls);
 #endif
diff --git a/arch/x86/mm/testmmiotrace.c b/arch/x86/mm/testmmiotrace.c
index 427fd1b56df5..8565d944f7cf 100644
--- a/arch/x86/mm/testmmiotrace.c
+++ b/arch/x86/mm/testmmiotrace.c
@@ -1,12 +1,13 @@
 /*
  * Written by Pekka Paalanen, 2008-2009 <pq@iki.fi>
  */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/module.h>
 #include <linux/io.h>
 #include <linux/mmiotrace.h>
 
-#define MODULE_NAME "testmmiotrace"
-
 static unsigned long mmio_address;
 module_param(mmio_address, ulong, 0);
 MODULE_PARM_DESC(mmio_address, " Start address of the mapping of 16 kB "
@@ -30,7 +31,7 @@ static unsigned v32(unsigned i)
 static void do_write_test(void __iomem *p)
 {
         unsigned int i;
-        pr_info(MODULE_NAME ": write test.\n");
+        pr_info("write test.\n");
         mmiotrace_printk("Write test.\n");
 
         for (i = 0; i < 256; i++)
@@ -47,7 +48,7 @@ static void do_read_test(void __iomem *p)
 {
         unsigned int i;
         unsigned errs[3] = { 0 };
-        pr_info(MODULE_NAME ": read test.\n");
+        pr_info("read test.\n");
         mmiotrace_printk("Read test.\n");
 
         for (i = 0; i < 256; i++)
@@ -68,7 +69,7 @@ static void do_read_test(void __iomem *p)
 
 static void do_read_far_test(void __iomem *p)
 {
-        pr_info(MODULE_NAME ": read far test.\n");
+        pr_info("read far test.\n");
         mmiotrace_printk("Read far test.\n");
 
         ioread32(p + read_far);
@@ -78,7 +79,7 @@ static void do_test(unsigned long size)
 {
         void __iomem *p = ioremap_nocache(mmio_address, size);
         if (!p) {
-                pr_err(MODULE_NAME ": could not ioremap, aborting.\n");
+                pr_err("could not ioremap, aborting.\n");
                 return;
         }
         mmiotrace_printk("ioremap returned %p.\n", p);
@@ -94,24 +95,22 @@ static int __init init(void)
         unsigned long size = (read_far) ? (8 << 20) : (16 << 10);
 
         if (mmio_address == 0) {
-                pr_err(MODULE_NAME ": you have to use the module argument "
-                                                        "mmio_address.\n");
-                pr_err(MODULE_NAME ": DO NOT LOAD THIS MODULE UNLESS"
-                                " YOU REALLY KNOW WHAT YOU ARE DOING!\n");
+                pr_err("you have to use the module argument mmio_address.\n");
+                pr_err("DO NOT LOAD THIS MODULE UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!\n");
                 return -ENXIO;
         }
 
-        pr_warning(MODULE_NAME ": WARNING: mapping %lu kB @ 0x%08lx in PCI "
-                "address space, and writing 16 kB of rubbish in there.\n",
-                 size >> 10, mmio_address);
+        pr_warning("WARNING: mapping %lu kB @ 0x%08lx in PCI address space, "
+                   "and writing 16 kB of rubbish in there.\n",
+                   size >> 10, mmio_address);
         do_test(size);
-        pr_info(MODULE_NAME ": All done.\n");
+        pr_info("All done.\n");
         return 0;
 }
 
 static void __exit cleanup(void)
 {
-        pr_debug(MODULE_NAME ": unloaded.\n");
+        pr_debug("unloaded.\n");
 }
 
 module_init(init);