Commit aceb1a8a authored Nov 23, 2016 by Rabin Vincent Committed by Greg Kroah-Hartman Aug 11, 2017

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




[ 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@axis.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent bc07fc6c

arch/arm/include/asm/ftrace.h

+18 −0

Original line number	Diff line number	Diff line
		@@ -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 */