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

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 <rabinv@axis.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h
index bfe2a2f5a644..22b73112b75f 100644
--- a/arch/arm/include/asm/ftrace.h
+++ b/arch/arm/include/asm/ftrace.h
@@ -54,6 +54,24 @@ static inline void *return_address(unsigned int level)
 
 #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 */