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Fix an objtool false positive, and objtool related

Browse source 
build warnings that happens on PIE-enabled architectures
 such as LoongArch.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'objtool-urgent-2025-02-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull objtool fixes from Ingo Molnar:
 "Fix an objtool false positive, and objtool related build warnings that
  happens on PIE-enabled architectures such as LoongArch"

* tag 'objtool-urgent-2025-02-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool: Add bch2_trans_unlocked_or_in_restart_error() to bcachefs noreturns
  objtool: Fix C jump table annotations for Clang
  vmlinux.lds: Ensure that const vars with relocations are mapped R/O
This commit is contained in:
Linus Torvalds 2025-02-28 16:45:36 -08:00
commit ad69e02128
5 changed files with 8 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
include/asm-generic/vmlinux.lds.h
View file

@ -457,7 +457,7 @@ defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELLER_CLANG)
. = ALIGN((align)); \
.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
__start_rodata = .; \
*(.rodata) *(.rodata.*) \
*(.rodata) *(.rodata.*) *(.data.rel.ro*) \
SCHED_DATA \
RO_AFTER_INIT_DATA /* Read only after init */ \
. = ALIGN(8); \

2
include/linux/compiler.h
View file

@ -110,7 +110,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
/* Unreachable code */
#ifdef CONFIG_OBJTOOL
/* Annotate a C jump table to allow objtool to follow the code flow */
#define __annotate_jump_table __section(".rodata..c_jump_table,\"a\",@progbits #")
#define __annotate_jump_table __section(".data.rel.ro.c_jump_table")
#else /* !CONFIG_OBJTOOL */
#define __annotate_jump_table
#endif /* CONFIG_OBJTOOL */

7
tools/objtool/check.c
View file

@ -2472,13 +2472,14 @@ static void mark_rodata(struct objtool_file *file)
*
* - .rodata: can contain GCC switch tables
* - .rodata.<func>: same, if -fdata-sections is being used
* - .rodata..c_jump_table: contains C annotated jump tables
* - .data.rel.ro.c_jump_table: contains C annotated jump tables
*
* .rodata.str1.* sections are ignored; they don't contain jump tables.
*/
for_each_sec(file, sec) {
if (!strncmp(sec->name, ".rodata", 7) &&
!strstr(sec->name, ".str1.")) {
if ((!strncmp(sec->name, ".rodata", 7) &&
!strstr(sec->name, ".str1.")) ||
!strncmp(sec->name, ".data.rel.ro", 12)) {
sec->rodata = true;
found = true;
}

2
tools/objtool/include/objtool/special.h
View file

@ -10,7 +10,7 @@
#include <objtool/check.h>
#include <objtool/elf.h>
#define C_JUMP_TABLE_SECTION ".rodata..c_jump_table"
#define C_JUMP_TABLE_SECTION ".data.rel.ro.c_jump_table"
struct special_alt {
struct list_head list;

2
tools/objtool/noreturns.h
View file

@ -19,7 +19,7 @@ NORETURN(__x64_sys_exit_group)
NORETURN(arch_cpu_idle_dead)
NORETURN(bch2_trans_in_restart_error)
NORETURN(bch2_trans_restart_error)
NORETURN(bch2_trans_unlocked_error)
NORETURN(bch2_trans_unlocked_or_in_restart_error)
NORETURN(cpu_bringup_and_idle)
NORETURN(cpu_startup_entry)
NORETURN(do_exit)