From: Michael Jeanson mjeanson@efficios.com
commit ad050d2390fccb22aa3e6f65e11757ce7a5a7ca5 upstream.
In v5.7 the powerpc syscall entry/exit logic was rewritten in C, on PPC64_ELF_ABI_V1 this resulted in the symbols in the syscall table changing from their dot prefixed variant to the non-prefixed ones.
Since ftrace prefixes a dot to the syscall names when matching them to build its syscall event list, this resulted in no syscall events being available.
Remove the PPC64_ELF_ABI_V1 specific version of arch_syscall_match_sym_name to have the same behavior across all powerpc variants.
Fixes: 68b34588e202 ("powerpc/64/sycall: Implement syscall entry/exit logic in C") Cc: stable@vger.kernel.org # v5.7+ Signed-off-by: Michael Jeanson mjeanson@efficios.com Reviewed-by: Mathieu Desnoyers mathieu.desnoyers@efficios.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20221201161442.2127231-1-mjeanson@efficios.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/include/asm/ftrace.h | 12 ------------ 1 file changed, 12 deletions(-)
--- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -64,17 +64,6 @@ void ftrace_graph_func(unsigned long ip, * those. */ #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME -#ifdef CONFIG_PPC64_ELF_ABI_V1 -static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) -{ - /* We need to skip past the initial dot, and the __se_sys alias */ - return !strcmp(sym + 1, name) || - (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) || - (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) || - (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) || - (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4)); -} -#else static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) { return !strcmp(sym, name) || @@ -83,7 +72,6 @@ static inline bool arch_syscall_match_sy (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) || (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4)); } -#endif /* CONFIG_PPC64_ELF_ABI_V1 */ #endif /* CONFIG_FTRACE_SYSCALLS */
#if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)