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

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[ 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>
This commit is contained in:
Rabin Vincent 2016-11-23 13:02:32 +01:00 committed by Greg Kroah-Hartman
parent 874f22658c
commit 5205f5216c
1 changed files with 18 additions and 0 deletions

18
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 */