Patch "ARM: 9078/1: Add warn suppress parameter to arm_gen_branch_link()" has been added to the 4.9-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    ARM: 9078/1: Add warn suppress parameter to arm_gen_branch_link()

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-9078-1-add-warn-suppress-parameter-to-arm_gen_branch_link.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From foo at baz Thu Sep 23 12:34:24 PM CEST 2021
From: Florian Fainelli <f.fainelli at gmail.com>
Date: Wed, 22 Sep 2021 10:02:44 -0700
Subject: ARM: 9078/1: Add warn suppress parameter to arm_gen_branch_link()
To: linux-kernel at vger.kernel.org
Cc: stable at vger.kernel.org, Greg Kroah-Hartman <gregkh at linuxfoundation.org>, Sasha Levin <sashal at kernel.org>, Alex Sverdlin <alexander.sverdlin at nokia.com>, Russell King <rmk+kernel at armlinux.org.uk>, Florian Fainelli <f.fainelli at gmail.com>, Steven Rostedt <rostedt at goodmis.org>, Ingo Molnar <mingo at redhat.com>, Russell King <linux at armlinux.org.uk>, linux-arm-kernel at lists.infradead.org (moderated list:ARM PORT)
Message-ID: <20210922170246.190499-3-f.fainelli at gmail.com>

From: Alex Sverdlin <alexander.sverdlin at nokia.com>

commit 890cb057a46d323fd8c77ebecb6485476614cd21 upstream

Will be used in the following patch. No functional change.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin at nokia.com>
Signed-off-by: Russell King <rmk+kernel at armlinux.org.uk>
Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 arch/arm/include/asm/insn.h |    8 ++++----
 arch/arm/kernel/ftrace.c    |    2 +-
 arch/arm/kernel/insn.c      |   19 ++++++++++---------
 3 files changed, 15 insertions(+), 14 deletions(-)

--- a/arch/arm/include/asm/insn.h
+++ b/arch/arm/include/asm/insn.h
@@ -12,18 +12,18 @@ arm_gen_nop(void)
 }
 
 unsigned long
-__arm_gen_branch(unsigned long pc, unsigned long addr, bool link);
+__arm_gen_branch(unsigned long pc, unsigned long addr, bool link, bool warn);
 
 static inline unsigned long
 arm_gen_branch(unsigned long pc, unsigned long addr)
 {
-	return __arm_gen_branch(pc, addr, false);
+	return __arm_gen_branch(pc, addr, false, true);
 }
 
 static inline unsigned long
-arm_gen_branch_link(unsigned long pc, unsigned long addr)
+arm_gen_branch_link(unsigned long pc, unsigned long addr, bool warn)
 {
-	return __arm_gen_branch(pc, addr, true);
+	return __arm_gen_branch(pc, addr, true, warn);
 }
 
 #endif
--- a/arch/arm/kernel/ftrace.c
+++ b/arch/arm/kernel/ftrace.c
@@ -97,7 +97,7 @@ int ftrace_arch_code_modify_post_process
 
 static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr)
 {
-	return arm_gen_branch_link(pc, addr);
+	return arm_gen_branch_link(pc, addr, true);
 }
 
 static int ftrace_modify_code(unsigned long pc, unsigned long old,
--- a/arch/arm/kernel/insn.c
+++ b/arch/arm/kernel/insn.c
@@ -2,8 +2,9 @@
 #include <linux/kernel.h>
 #include <asm/opcodes.h>
 
-static unsigned long
-__arm_gen_branch_thumb2(unsigned long pc, unsigned long addr, bool link)
+static unsigned long __arm_gen_branch_thumb2(unsigned long pc,
+					     unsigned long addr, bool link,
+					     bool warn)
 {
 	unsigned long s, j1, j2, i1, i2, imm10, imm11;
 	unsigned long first, second;
@@ -11,7 +12,7 @@ __arm_gen_branch_thumb2(unsigned long pc
 
 	offset = (long)addr - (long)(pc + 4);
 	if (offset < -16777216 || offset > 16777214) {
-		WARN_ON_ONCE(1);
+		WARN_ON_ONCE(warn);
 		return 0;
 	}
 
@@ -32,8 +33,8 @@ __arm_gen_branch_thumb2(unsigned long pc
 	return __opcode_thumb32_compose(first, second);
 }
 
-static unsigned long
-__arm_gen_branch_arm(unsigned long pc, unsigned long addr, bool link)
+static unsigned long __arm_gen_branch_arm(unsigned long pc, unsigned long addr,
+					  bool link, bool warn)
 {
 	unsigned long opcode = 0xea000000;
 	long offset;
@@ -43,7 +44,7 @@ __arm_gen_branch_arm(unsigned long pc, u
 
 	offset = (long)addr - (long)(pc + 8);
 	if (unlikely(offset < -33554432 || offset > 33554428)) {
-		WARN_ON_ONCE(1);
+		WARN_ON_ONCE(warn);
 		return 0;
 	}
 
@@ -53,10 +54,10 @@ __arm_gen_branch_arm(unsigned long pc, u
 }
 
 unsigned long
-__arm_gen_branch(unsigned long pc, unsigned long addr, bool link)
+__arm_gen_branch(unsigned long pc, unsigned long addr, bool link, bool warn)
 {
 	if (IS_ENABLED(CONFIG_THUMB2_KERNEL))
-		return __arm_gen_branch_thumb2(pc, addr, link);
+		return __arm_gen_branch_thumb2(pc, addr, link, warn);
 	else
-		return __arm_gen_branch_arm(pc, addr, link);
+		return __arm_gen_branch_arm(pc, addr, link, warn);
 }


Patches currently in stable-queue which might be from f.fainelli at gmail.com are

queue-4.9/arm-9098-1-ftrace-module_plt-fix-build-problem-without-dynamic_ftrace.patch
queue-4.9/arm-9079-1-ftrace-add-module_plts-support.patch
queue-4.9/arm-9078-1-add-warn-suppress-parameter-to-arm_gen_branch_link.patch
queue-4.9/arm-9077-1-plt-move-struct-plt_entries-definition-to-header.patch