Some warning were showed by objtool using gcc 7.2.0 kernel/locking/rwsem.o: warning: objtool: up_read()+0x11: call without frame pointer save/setup kernel/locking/rwsem.o: warning: objtool: up_write()+0x17: call without frame pointer save/setup kernel/locking/rwsem.o: warning: objtool: downgrade_write()+0x22: call without frame pointer save/setup
which means gcc placed an inline asm function and its call instruction before the frame pointer setup. This series forces a stack frame to be created before the call instruction by listing the stack pointer as an output operand in the inline asm statement. Changes in v2: - Update first parameter from _ASM_ADD to '%3' at __downgrade_write() Miguel Bernal Marin (3): locking/rwsem/x86: Add stack frame dependency for __up_read() locking/rwsem/x86: Add stack frame dependency for __up_write() locking/rwsem/x86: Add stack frame dependency for __downgrade_write() arch/x86/include/asm/rwsem.h | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) -- 2.14.1
