linux-kernel - [PATCH for v4.9 LTS 81/87] ARM: 8632/1: ftrace: fix syscall name matching

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Message-ID: <20170715012538.10101-81-alexander.levin@verizon.com>
Date:   Sat, 15 Jul 2017 01:26:25 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Rabin Vincent <rabinv@...s.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH for v4.9 LTS 81/87] ARM: 8632/1: ftrace: fix syscall name
 matching

From: Rabin Vincent <rabinv@...s.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 <rabinv@...s.com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 arch/arm/include/asm/ftrace.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

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 */
-- 
2.11.0