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9142be9e64
linux/tools/objtool
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Josh Poimboeuf 9142be9e64 x86/syscall: Mark exit[_group] syscall handlers __noreturn 
The direct-call syscall dispatch function doesn't know that the exit()
and exit_group() syscall handlers don't return, so the call sites aren't
optimized accordingly.

Fix that by marking the exit syscall declarations __noreturn.

Fixes the following warnings:

  vmlinux.o: warning: objtool: x64_sys_call+0x2804: __x64_sys_exit() is missing a __noreturn annotation
  vmlinux.o: warning: objtool: ia32_sys_call+0x29b6: __ia32_sys_exit_group() is missing a __noreturn annotation

Fixes: 1e3ad78334 ("x86/syscall: Don't force use of indirect calls for system calls")
Closes: https://lkml.kernel.org/lkml/6dba9b32-db2c-4e6d-9500-7a08852f17a3@paulmck-laptop
Reported-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/5d8882bc077d8eadcc7fd1740b56dfb781f12288.1719381528.git.jpoimboe@kernel.org
2024-06-28 15:23:38 +02:00
..
arch LoongArch changes for v6.9 2024-03-22 10:22:45 -07:00
Documentation objtool: Move noreturn function list to separate file 2023-05-16 06:31:55 -07:00
include/objtool objtool: Check local label in add_dead_ends() 2024-03-11 22:23:47 +08:00
.gitignore objtool: Install libsubcmd in build 2023-01-30 16:27:46 -08:00
Build objtool: Install libsubcmd in build 2023-01-30 16:27:46 -08:00
builtin-check.c objtool: Add verbose option for disassembling affected functions 2023-05-16 06:31:51 -07:00
check.c objtool: Fix compile failure when using the x32 compiler 2024-03-30 22:12:37 +01:00
elf.c objtool: Remove max symbol name length limitation 2023-10-05 17:01:28 -07:00
Makefile objtool/LoongArch: Enable orc to be built 2024-03-11 22:23:47 +08:00
noreturns.h x86/syscall: Mark exit[_group] syscall handlers __noreturn 2024-06-28 15:23:38 +02:00
objtool.c objtool: Propagate early errors 2023-10-05 17:01:11 -07:00
orc_dump.c objtool/x86: Separate arch-specific and generic parts 2024-03-11 22:23:47 +08:00
orc_gen.c objtool/x86: Separate arch-specific and generic parts 2024-03-11 22:23:47 +08:00
special.c objtool: Get rid of reloc->addend 2023-06-07 10:03:23 -07:00
sync-check.sh objtool: Add objtool_types.h 2023-03-23 23:18:56 +01:00
weak.c objtool: Ditch subcommands 2022-04-22 12:32:01 +02:00