On Wed, Jul 08, 2015 at 11:22:34AM -0500, Josh Poimboeuf wrote: > > Writing the asm with a clobber of the stack pointer causes all stack > > accesses to go via the frame pointer, which causes pretty horrible > > code. > > As far as I can tell, most (but not all) kernel stack accesses already > occur via the frame pointer anyway. Is that bad? Can you clarify what > you mean by horrible code?
If you already have a frame pointer anyway it won't get much worse, sure :-) If you don't have one yet you will get one, and a stack frame, and all that boilerplate. You don't want to force that if you don't need it. Segher
