4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rabin Vincent <rab...@axis.com>


[ 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.

Signed-off-by: Rabin Vincent <rab...@axis.com>
Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 arch/arm/include/asm/ftrace.h |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- a/arch/arm/include/asm/ftrace.h
+++ b/arch/arm/include/asm/ftrace.h
@@ -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 */


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