powerpc/ftrace: Use pr_fmt() to namespace error messages

The printks() in our ftrace code have no prefix, so they appear on the
console with very little context, eg:

  Branch out of range

Use pr_fmt() & pr_err() to add a prefix. While we're at it, collapse a
few split lines that don't need to be, and add a missing newline to one
message.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 20 insertions, 23 deletions

diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index 96efc664b49d..d178834fe508 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -10,6 +10,8 @@
  *
  */
 
+#define pr_fmt(fmt) "ftrace-powerpc: " fmt
+
 #include <linux/spinlock.h>
 #include <linux/hardirq.h>
 #include <linux/uaccess.h>
@@ -115,7 +117,7 @@ __ftrace_make_nop(struct module *mod,
 
         /* Make sure that that this is still a 24bit jump */
         if (!is_bl_op(op)) {
-                printk(KERN_ERR "Not expected bl: opcode is %x\n", op);
+                pr_err("Not expected bl: opcode is %x\n", op);
                 return -EINVAL;
         }
 
@@ -125,12 +127,12 @@ __ftrace_make_nop(struct module *mod,
         pr_devel("ip:%lx jumps to %p", ip, tramp);
 
         if (!is_module_trampoline(tramp)) {
-                printk(KERN_ERR "Not a trampoline\n");
+                pr_err("Not a trampoline\n");
                 return -EINVAL;
         }
 
         if (module_trampoline_target(mod, tramp, &ptr)) {
-                printk(KERN_ERR "Failed to get trampoline target\n");
+                pr_err("Failed to get trampoline target\n");
                 return -EFAULT;
         }
 
@@ -139,8 +141,7 @@ __ftrace_make_nop(struct module *mod,
         entry = ppc_global_function_entry((void *)addr);
         /* This should match what was called */
         if (ptr != entry) {
-                printk(KERN_ERR "addr %lx does not match expected %lx\n",
-                        ptr, entry);
+                pr_err("addr %lx does not match expected %lx\n", ptr, entry);
                 return -EINVAL;
         }
 
@@ -180,7 +181,7 @@ __ftrace_make_nop(struct module *mod,
 
         /* Make sure that that this is still a 24bit jump */
         if (!is_bl_op(op)) {
-                printk(KERN_ERR "Not expected bl: opcode is %x\n", op);
+                pr_err("Not expected bl: opcode is %x\n", op);
                 return -EINVAL;
         }
 
@@ -199,7 +200,7 @@ __ftrace_make_nop(struct module *mod,
 
         /* Find where the trampoline jumps to */
         if (probe_kernel_read(jmp, (void *)tramp, sizeof(jmp))) {
-                printk(KERN_ERR "Failed to read %lx\n", tramp);
+                pr_err("Failed to read %lx\n", tramp);
                 return -EFAULT;
         }
 
@@ -210,7 +211,7 @@ __ftrace_make_nop(struct module *mod,
             ((jmp[1] & 0xffff0000) != 0x398c0000) ||
             (jmp[2] != 0x7d8903a6) ||
             (jmp[3] != 0x4e800420)) {
-                printk(KERN_ERR "Not a trampoline\n");
+                pr_err("Not a trampoline\n");
                 return -EINVAL;
         }
 
@@ -222,8 +223,7 @@ __ftrace_make_nop(struct module *mod,
         pr_devel(" %lx ", tramp);
 
         if (tramp != addr) {
-                printk(KERN_ERR
-                       "Trampoline location %08lx does not match addr\n",
+                pr_err("Trampoline location %08lx does not match addr\n",
                        tramp);
                 return -EINVAL;
         }
@@ -264,15 +264,13 @@ int ftrace_make_nop(struct module *mod,
          */
         if (!rec->arch.mod) {
                 if (!mod) {
-                        printk(KERN_ERR "No module loaded addr=%lx\n",
-                               addr);
+                        pr_err("No module loaded addr=%lx\n", addr);
                         return -EFAULT;
                 }
                 rec->arch.mod = mod;
         } else if (mod) {
                 if (mod != rec->arch.mod) {
-                        printk(KERN_ERR
-                               "Record mod %p not equal to passed in mod %p\n",
+                        pr_err("Record mod %p not equal to passed in mod %p\n",
                                rec->arch.mod, mod);
                         return -EINVAL;
                 }
@@ -309,25 +307,24 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
          * just mask it out when doing the compare.
          */
         if ((op[0] != 0x48000008) || ((op[1] & 0xffff0000) != 0xe8410000)) {
-                printk(KERN_ERR "Unexpected call sequence: %x %x\n",
-                        op[0], op[1]);
+                pr_err("Unexpected call sequence: %x %x\n", op[0], op[1]);
                 return -EINVAL;
         }
 
         /* If we never set up a trampoline to ftrace_caller, then bail */
         if (!rec->arch.mod->arch.tramp) {
-                printk(KERN_ERR "No ftrace trampoline\n");
+                pr_err("No ftrace trampoline\n");
                 return -EINVAL;
         }
 
         /* Ensure branch is within 24 bits */
         if (!create_branch(ip, rec->arch.mod->arch.tramp, BRANCH_SET_LINK)) {
-                printk(KERN_ERR "Branch out of range");
+                pr_err("Branch out of range\n");
                 return -EINVAL;
         }
 
         if (patch_branch(ip, rec->arch.mod->arch.tramp, BRANCH_SET_LINK)) {
-                printk(KERN_ERR "REL24 out of range!\n");
+                pr_err("REL24 out of range!\n");
                 return -EINVAL;
         }
 
@@ -346,13 +343,13 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
 
         /* It should be pointing to a nop */
         if (op != PPC_INST_NOP) {
-                printk(KERN_ERR "Expected NOP but have %x\n", op);
+                pr_err("Expected NOP but have %x\n", op);
                 return -EINVAL;
         }
 
         /* If we never set up a trampoline to ftrace_caller, then bail */
         if (!rec->arch.mod->arch.tramp) {
-                printk(KERN_ERR "No ftrace trampoline\n");
+                pr_err("No ftrace trampoline\n");
                 return -EINVAL;
         }
 
@@ -360,7 +357,7 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
         op = create_branch((unsigned int *)ip,
                            rec->arch.mod->arch.tramp, BRANCH_SET_LINK);
         if (!op) {
-                printk(KERN_ERR "REL24 out of range!\n");
+                pr_err("REL24 out of range!\n");
                 return -EINVAL;
         }
 
@@ -398,7 +395,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
          * already have a module defined.
          */
         if (!rec->arch.mod) {
-                printk(KERN_ERR "No module loaded\n");
+                pr_err("No module loaded\n");
                 return -EINVAL;
         }