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Date: Wed, 08 Apr 2020 21:13:10 +0300 From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru> To: Brian Gerst <brgerst@...il.com>, linux-kernel@...r.kernel.org Cc: Thomas Gleixner <tglx@...utronix.de>, Dominik Brodowski <linux@...inikbrodowski.net>, Andy Lutomirski <luto@...nel.org> Subject: [PATCH] tracing/x86: fix trace event registration for syscalls without arguments Syscalls without arguments now has no ABI subs, instead of that macro SYSCALL_DEFINE0() defines __abi_sys_name as aliase to __do_sys_name. As a result in find_syscall_meta() kallsyms_lookup() returns "__do_sys_name" which does not match with declared trace event. Also see commit 1c758a2202a6 ("tracing/x86: Update syscall trace events to handle new prefixed syscall func names") Fixes: d2b5de495ee9 ("x86/entry: Refactor SYSCALL_DEFINE0 macros") Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru> --- arch/x86/include/asm/ftrace.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h index 85be2f506272..70b96cae5b42 100644 --- a/arch/x86/include/asm/ftrace.h +++ b/arch/x86/include/asm/ftrace.h @@ -61,11 +61,12 @@ static inline bool arch_syscall_match_sym_name(const char *sym, const char *name { /* * Compare the symbol name with the system call name. Skip the - * "__x64_sys", "__ia32_sys" or simple "sys" prefix. + * "__x64_sys", "__ia32_sys", "__do_sys" or simple "sys" prefix. */ return !strcmp(sym + 3, name + 3) || (!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) || - (!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)); + (!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)) || + (!strncmp(sym, "__do_sys", 8) && !strcmp(sym + 8, name + 3)); } #ifndef COMPILE_OFFSETS
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