MIPS: Remove function size check in get_frame_info()

Patch (b6c7a324df37b "MIPS: Fix get_frame_info() handling of
microMIPS function size.") introduces additional function size
check for microMIPS by only checking insn between ip and ip + func_size.
However, func_size in get_frame_info() is always 0 if KALLSYMS is not
enabled. This causes get_frame_info() to return immediately without
calculating correct frame_size, which in turn causes "Can't analyze
schedule() prologue" warning messages at boot time.

This patch removes func_size check, and let the frame_size check run
up to 128 insns for both MIPS and microMIPS.

Signed-off-by: Jun-Ru Chang <jrjang@realtek.com>
Signed-off-by: Tony Wu <tonywu@realtek.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: b6c7a324df37b ("MIPS: Fix get_frame_info() handling of microMIPS function size.")
Cc: <ralf@linux-mips.org>
Cc: <jhogan@kernel.org>
Cc: <macro@mips.com>
Cc: <yamada.masahiro@socionext.com>
Cc: <peterz@infradead.org>
Cc: <mingo@kernel.org>
Cc: <linux-mips@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 6829a06..339870e 100644 (file)
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -371,7 +371,7 @@ static inline int is_sp_move_ins(union mips_instruction *ip, int *frame_size)
 static int get_frame_info(struct mips_frame_info *info)
 {
        bool is_mmips = IS_ENABLED(CONFIG_CPU_MICROMIPS);
-       union mips_instruction insn, *ip, *ip_end;
+       union mips_instruction insn, *ip;
        const unsigned int max_insns = 128;
        unsigned int last_insn_size = 0;
        unsigned int i;
@@ -384,10 +384,9 @@ static int get_frame_info(struct mips_frame_info *info)
        if (!ip)
                goto err;
 
-       ip_end = (void *)ip + info->func_size;
-
-       for (i = 0; i < max_insns && ip < ip_end; i++) {
+       for (i = 0; i < max_insns; i++) {
                ip = (void *)ip + last_insn_size;
+
                if (is_mmips && mm_insn_16bit(ip->halfword[0])) {
                        insn.word = ip->halfword[0] << 16;
                        last_insn_size = 2;