MIPS: oprofile: Enable backtrace on timer-based profiling

Allow unsupported CPU types to use backtrace with timer-based profiling.
Some CPUs (notably OCTEON) lack architecture-specific oprofile driver. In
such case oprofile can fallback to timer-based mode, and arch code can
still provide the backtrace functionality. So just set up the backtrace
hook always.

Signed-off-by: Aaro Koskinen <aaro.koskinen@nsn.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8108/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/oprofile/common.c b/arch/mips/oprofile/common.c
index feb987981f55c7891c41f81a5827cab1f6c6b0db..a26cbe372e061602392650b67f62777992b85bed 100644 (file)
--- a/arch/mips/oprofile/common.c
+++ b/arch/mips/oprofile/common.c
@@ -110,6 +110,12 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
                break;
        };
 
+       /*
+        * Always set the backtrace. This allows unsupported CPU types to still
+        * use timer-based oprofile.
+        */
+       ops->backtrace = op_mips_backtrace;
+
        if (!lmodel)
                return -ENODEV;
 
@@ -125,7 +131,6 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
        ops->start              = op_mips_start;
        ops->stop               = op_mips_stop;
        ops->cpu_type           = lmodel->cpu_type;
-       ops->backtrace          = op_mips_backtrace;
 
        printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
               lmodel->cpu_type);