On Wed, Jul 03, 2019 at 10:23:21AM -0700, Randy Dunlap wrote: > On 7/3/19 9:44 AM, Josh Poimboeuf wrote: > > On Tue, Jul 02, 2019 at 11:47:02AM -0700, Randy Dunlap wrote: > >> On 7/2/19 2:51 AM, Stephen Rothwell wrote: > >>> Hi all, > >>> > >>> Changes since 20190701: > >>> > >> > >> on x86_64: > >> > >> kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x22: can't find switch jump table > > > > I don't see it on current linux-next/master. Can you share the config > > and .o? > > > > This warning happened in 6 of 10 builds for 20190702. > > Today (20190703) I don't see it at all, but I see this instead: > kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0xa3: sibling call from callable instruction with modified stack frame > > Kernel (rand)config file and .o file for 20190702 are attached. Thanks, I'm able to recreate the sibling call warning with a randconfig on today's linux-next. GCC is doing some funky stuff. With my randconfig, ___bpf_prog_run() has 166 indirect calls to its jump table. Seems (a bit!) excessive. I'll need to look into it. -- Josh
