From: "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx> x86 will shortly start using -fpatchable-function-entry for purposes other than ftrace, make sure the __patchable_function_entry section isn't merged in the mcount_loc section. Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx> --- include/asm-generic/vmlinux.lds.h | 11 ++++++++++- kernel/trace/Kconfig | 6 ++++++ tools/objtool/check.c | 3 ++- 3 files changed, 18 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 7515a465ec03..13b197ef0d63 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -154,6 +154,14 @@ #define MEM_DISCARD(sec) *(.mem##sec) #endif +#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE +#define KEEP_PATCHABLE KEEP(*(__patchable_function_entries)) +#define PATCHABLE_DISCARDS +#else +#define KEEP_PATCHABLE +#define PATCHABLE_DISCARDS *(__patchable_function_entries) +#endif + #ifdef CONFIG_FTRACE_MCOUNT_RECORD /* * The ftrace call sites are logged to a section whose name depends on the @@ -172,7 +180,7 @@ #define MCOUNT_REC() . = ALIGN(8); \ __start_mcount_loc = .; \ KEEP(*(__mcount_loc)) \ - KEEP(*(__patchable_function_entries)) \ + KEEP_PATCHABLE \ __stop_mcount_loc = .; \ ftrace_stub_graph = ftrace_stub; \ ftrace_ops_list_func = arch_ftrace_ops_list_func; @@ -1024,6 +1032,7 @@ #define COMMON_DISCARDS \ SANITIZER_DISCARDS \ + PATCHABLE_DISCARDS \ *(.discard) \ *(.discard.*) \ *(.modinfo) \ diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 1052126bdca2..e9e95c790b8e 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -51,6 +51,12 @@ config HAVE_DYNAMIC_FTRACE_WITH_ARGS This allows for use of regs_get_kernel_argument() and kernel_stack_pointer(). +config HAVE_DYNAMIC_FTRACE_NO_PATCHABLE + bool + help + If the architecture generates __patchable_function_entries sections + but does not want them included in the ftrace locations. + config HAVE_FTRACE_MCOUNT_RECORD bool help diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 0cec74da7ffe..f23e8d11f6d4 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -4110,7 +4110,8 @@ static int validate_ibt(struct objtool_file *file) !strcmp(sec->name, "__bug_table") || !strcmp(sec->name, "__ex_table") || !strcmp(sec->name, "__jump_table") || - !strcmp(sec->name, "__mcount_loc")) + !strcmp(sec->name, "__mcount_loc") || + strstr(sec->name, "__patchable_function_entries")) continue; list_for_each_entry(reloc, &sec->reloc->reloc_list, list) -- 2.37.2
