A lot of objtool fixes showed up in linux-next, so I looked at some remaining ones. This one comes a lot up in some configurations
https://godbolt.org/z/ZZLVD- struct ov7670_win_size { int width; int height; }; struct ov7670_devtype { struct ov7670_win_size *win_sizes; unsigned n_win_sizes; }; struct ov7670_info { int min_width; int min_height; struct ov7670_devtype devtype; } a; int b; int fn1() { struct ov7670_info c = a; int i = 0; for (; i < c.devtype.n_win_sizes; i++) { struct ov7670_win_size d = c.devtype.win_sizes[i]; if (c.min_width && d.width < d.height < c.min_height) if (b) return 0; } return 2; } $ clang-8 -O2 -fno-omit-frame-pointer -fno-strict-overflow -c ov7670.i $ objtool check --no-unreachable --uaccess ov7670.o ov7670.o: warning: objtool: fn1 uses BP as a scratch register Arnd
