MIPS, Tracing: Clean up ftrace_make_nop()

This moves the comments out of ftrace_make_nop() and cleans it.  At the
same time, a macro MCOUNT_OFFSET_INSNS is defined for sharing with the
next patch.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2008/
Signed-off-by: Ralf Baechle <ralf@duck.linux-mips.net>

diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
index 40ef34ccb76b48120b5882c897f5837b275c06f7..bc91e4aa08e969bdc0ad85811f67c8fd397b2261 100644 (file)
--- a/arch/mips/kernel/ftrace.c
+++ b/arch/mips/kernel/ftrace.c
@@ -24,8 +24,6 @@
 #define JAL 0x0c000000         /* jump & link: ip --> ra, jump to target */
 #define ADDR_MASK 0x03ffffff   /*  op_code|addr : 31...26|25 ....0 */
 
-#define INSN_B_1F_4 0x10000004 /* b 1f; offset = 4 */
-#define INSN_B_1F_5 0x10000005 /* b 1f; offset = 5 */
 #define INSN_NOP 0x00000000    /* nop */
 #define INSN_JAL(addr) \
        ((unsigned int)(JAL | (((addr) >> 2) & ADDR_MASK)))
@@ -84,6 +82,42 @@ static int ftrace_modify_code(unsigned long ip, unsigned int new_code)
        return 0;
 }
 
+/*
+ * The details about the calling site of mcount on MIPS
+ *
+ * 1. For kernel:
+ *
+ * move at, ra
+ * jal _mcount         --> nop
+ *
+ * 2. For modules:
+ *
+ * 2.1 For KBUILD_MCOUNT_RA_ADDRESS and CONFIG_32BIT
+ *
+ * lui v1, hi_16bit_of_mcount        --> b 1f (0x10000005)
+ * addiu v1, v1, low_16bit_of_mcount
+ * move at, ra
+ * move $12, ra_address
+ * jalr v1
+ *  sub sp, sp, 8
+ *                                  1: offset = 5 instructions
+ * 2.2 For the Other situations
+ *
+ * lui v1, hi_16bit_of_mcount        --> b 1f (0x10000004)
+ * addiu v1, v1, low_16bit_of_mcount
+ * move at, ra
+ * jalr v1
+ *  nop | move $12, ra_address | sub sp, sp, 8
+ *                                  1: offset = 4 instructions
+ */
+
+#if defined(KBUILD_MCOUNT_RA_ADDRESS) && defined(CONFIG_32BIT)
+#define MCOUNT_OFFSET_INSNS 5
+#else
+#define MCOUNT_OFFSET_INSNS 4
+#endif
+#define INSN_B_1F (0x10000000 | MCOUNT_OFFSET_INSNS)
+
 int ftrace_make_nop(struct module *mod,
                    struct dyn_ftrace *rec, unsigned long addr)
 {
@@ -94,36 +128,8 @@ int ftrace_make_nop(struct module *mod,
         * If ip is in kernel space, no long call, otherwise, long call is
         * needed.
         */
-       if (in_kernel_space(ip)) {
-               /*
-                * move at, ra
-                * jal _mcount          --> nop
-                */
-               new = INSN_NOP;
-       } else {
-#if defined(KBUILD_MCOUNT_RA_ADDRESS) && defined(CONFIG_32BIT)
-               /*
-                * lui v1, hi_16bit_of_mcount        --> b 1f (0x10000005)
-                * addiu v1, v1, low_16bit_of_mcount
-                * move at, ra
-                * move $12, ra_address
-                * jalr v1
-                *  sub sp, sp, 8
-                *                                  1: offset = 5 instructions
-                */
-               new = INSN_B_1F_5;
-#else
-               /*
-                * lui v1, hi_16bit_of_mcount        --> b 1f (0x10000004)
-                * addiu v1, v1, low_16bit_of_mcount
-                * move at, ra
-                * jalr v1
-                *  nop | move $12, ra_address | sub sp, sp, 8
-                *                                  1: offset = 4 instructions
-                */
-               new = INSN_B_1F_4;
-#endif
-       }
+       new = in_kernel_space(ip) ? INSN_NOP : INSN_B_1F;
+
        return ftrace_modify_code(ip, new);
 }