4.4-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 2b424cfc69728224fcb5fad138ea7260728e0901 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/mips/kernel/process.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index ebd8a715fe38..e6102775892d 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -339,7 +339,7 @@ static inline int is_sp_move_ins(union mips_instruction *ip) 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; @@ -351,10 +351,9 @@ 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.halfword[0] = 0; insn.halfword[1] = ip->halfword[0];