MIPS: Mask jump target in ftrace_dyn_arch_init_insns().

The current code is abusing the uasm interface by passing jump target
addresses with high bits set.  Mask the addresses to avoid annoying
messages at boot time.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/1922/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
index 94ca2b018af70ff3191d4e44055311efc09e800d..feb8021a305f49a4e6f366183e27626316398ed3 100644 (file)
--- a/arch/mips/kernel/ftrace.c
+++ b/arch/mips/kernel/ftrace.c
@@ -23,6 +23,7 @@
 
 #define JAL 0x0c000000         /* jump & link: ip --> ra, jump to target */
 #define ADDR_MASK 0x03ffffff   /*  op_code|addr : 31...26|25 ....0 */
+#define JUMP_RANGE_MASK ((1UL << 28) - 1)
 
 #define INSN_NOP 0x00000000    /* nop */
 #define INSN_JAL(addr) \
@@ -44,12 +45,12 @@ static inline void ftrace_dyn_arch_init_insns(void)
 
        /* jal (ftrace_caller + 8), jump over the first two instruction */
        buf = (u32 *)&insn_jal_ftrace_caller;
-       uasm_i_jal(&buf, (FTRACE_ADDR + 8));
+       uasm_i_jal(&buf, (FTRACE_ADDR + 8) & JUMP_RANGE_MASK);
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
        /* j ftrace_graph_caller */
        buf = (u32 *)&insn_j_ftrace_graph_caller;
-       uasm_i_j(&buf, (unsigned long)ftrace_graph_caller);
+       uasm_i_j(&buf, (unsigned long)ftrace_graph_caller & JUMP_RANGE_MASK);
 #endif
 }