linux-kernel - [PATCH AUTOSEL 4.9 18/19] MIPS: Remove function size check in get_frame

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Message-Id: <20190228151517.12705-18-sashal@kernel.org>
Date:   Thu, 28 Feb 2019 10:15:14 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jun-Ru Chang <jrjang@...ltek.com>, Tony Wu <tonywu@...ltek.com>,
        Paul Burton <paul.burton@...s.com>, ralf@...ux-mips.org,
        jhogan@...nel.org, macro@...s.com, yamada.masahiro@...ionext.com,
        peterz@...radead.org, mingo@...nel.org, linux-mips@...r.kernel.org,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.9 18/19] MIPS: Remove function size check in get_frame_info()

From: Jun-Ru Chang <jrjang@...ltek.com>

[ 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@...ltek.com>
Signed-off-by: Tony Wu <tonywu@...ltek.com>
Signed-off-by: Paul Burton <paul.burton@...s.com>
Fixes: b6c7a324df37b ("MIPS: Fix get_frame_info() handling of microMIPS function size.")
Cc: <ralf@...ux-mips.org>
Cc: <jhogan@...nel.org>
Cc: <macro@...s.com>
Cc: <yamada.masahiro@...ionext.com>
Cc: <peterz@...radead.org>
Cc: <mingo@...nel.org>
Cc: <linux-mips@...r.kernel.org>
Cc: <linux-kernel@...r.kernel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 1cc133e7026fd..fffd031dc6b61 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -344,7 +344,7 @@ 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;
@@ -356,10 +356,9 @@ 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];
-- 
2.19.1