Patch "ARM: 8632/1: ftrace: fix syscall name matching" has been added to the 4.9-stable tree

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

ARM: 8632/1: ftrace: fix syscall name matching

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-8632-1-ftrace-fix-syscall-name-matching.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 <[email protected]> know about it.

From: Rabin Vincent <[email protected]>
Date: Wed, 23 Nov 2016 13:02:32 +0100
Subject: ARM: 8632/1: ftrace: fix syscall name matching

From: Rabin Vincent <[email protected]>

[ Upstream commit 270c8cf1cacc69cb8d99dea812f06067a45e4609 ]

ARM has a few system calls (most notably mmap) for which the names of the functions which are referenced in the syscall table do not match the names of the syscall tracepoints. As a consequence of this, these tracepoints are not made available. Implement arch_syscall_match_sym_name to fix this and allow tracing even these system calls.

---
 arch/arm/include/asm/ftrace.h |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

@@ -54,6 +54,24 @@ static inline void *return_address(unsig
 
 #define ftrace_return_address(n) return_address(n)
 
+#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
+
+static inline bool arch_syscall_match_sym_name(const char *sym,
+					       const char *name)
+{
+	if (!strcmp(sym, "sys_mmap2"))
+		sym = "sys_mmap_pgoff";
+	else if (!strcmp(sym, "sys_statfs64_wrapper"))
+		sym = "sys_statfs64";
+	else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
+		sym = "sys_fstatfs64";
+	else if (!strcmp(sym, "sys_arm_fadvise64_64"))
+		sym = "sys_fadvise64_64";
+
+	/* Ignore case since sym may start with "SyS" instead of "sys" */
+	return !strcasecmp(sym, name);
+}
+
 #endif /* ifndef __ASSEMBLY__ */
 
 #endif /* _ASM_ARM_FTRACE */

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/arm-8632-1-ftrace-fix-syscall-name-matching.patch