linux-kernel - [PATCH] ARM: ftrace: fix syscall name matching

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Date:   Mon, 14 Nov 2016 14:03:45 +0100
From:   Rabin Vincent <rabin.vincent@...s.com>
To:     linux@...linux.org.uk
Cc:     rostedt@...dmis.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rabin Vincent <rabinv@...s.com>
Subject: [PATCH] ARM: ftrace: fix syscall name matching

From: Rabin Vincent <rabinv@...s.com>

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@...s.com>
---
 arch/arm/include/asm/ftrace.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h
index bfe2a2f..8467909 100644
--- a/arch/arm/include/asm/ftrace.h
+++ b/arch/arm/include/asm/ftrace.h
@@ -54,6 +54,27 @@ 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)
+{
+	/* Skip sys_ */
+	sym += 4;
+	name += 4;
+
+	if (!strcmp(sym, "mmap2"))
+		sym = "mmap_pgoff";
+	else if (!strcmp(sym, "statfs64_wrapper"))
+		sym = "statfs64";
+	else if (!strcmp(sym, "fstatfs64_wrapper"))
+		sym = "fstatfs64";
+	else if (!strcmp(sym, "arm_fadvise64_64"))
+		sym = "fadvise64_64";
+
+	return !strcmp(sym, name);
+}
+
 #endif /* ifndef __ASSEMBLY__ */
 
 #endif /* _ASM_ARM_FTRACE */
-- 
2.1.4