On Tue, Sep 19, 2017 at 06:37:39PM -0500, Miguel Bernal Marin wrote: > 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. > > Also to be easy to maintain and understand the operands from the extended > assembler instructions were converted to named operands.
I've got a patch going around which will change the way we do this, so you'll probably need to do a v3 after my patch gets merged. I'll add you to cc for the next revision. -- Josh
