Josh Poimboeuf fee55fffbf objtool: Handle Clang RSP musical chairs ...

[ Upstream commit 7fdaa640c8 ]

For no apparent reason (possibly related to CONFIG_KMSAN), Clang can
randomly pass the value of RSP to other registers and then back again to
RSP.  Handle that accordingly.

Fixes the following warnings:

  drivers/input/misc/uinput.o: warning: objtool: uinput_str_to_user+0x165: undefined stack state
  drivers/input/misc/uinput.o: warning: objtool: uinput_str_to_user+0x165: unknown CFA base reg -1

Reported-by: Arnd Bergmann <arnd@arndb.de>
Closes: https://lore.kernel.org/90956545-2066-46e3-b547-10c884582eb0@app.fastmail.com
Link: https://patch.msgid.link/240e6a172cc73292499334a3724d02ccb3247fc7.1772818491.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-04-02 13:09:29 +02:00

..

loongarch

objtool/LoongArch: Mark special atomic instruction as INSN_BUG type

2025-09-25 11:13:45 +02:00

powerpc

…

x86

objtool: Handle Clang RSP musical chairs

2026-04-02 13:09:29 +02:00