On Sun, Jul 14, 2019 at 07:36:55PM -0500, Josh Poimboeuf wrote: > There have been a lot of objtool bug reports lately, mainly related to > Clang and BPF. As part of fixing those bugs, I added some improvements > to objtool which uncovered yet more bugs (some kernel, some objtool). > > I've given these patches a lot of testing with both GCC and Clang. More > compile testing of objtool would be appreciated, as the kbuild test > robot doesn't seem to be paying much attention to my branches lately. > > There are still at least three outstanding issues: > > 1) With clang I see: > > drivers/gpu/drm/i915/gem/i915_gem_execbuffer.o: warning: objtool: > .altinstr_replacement+0x88: redundant UACCESS disable > > I haven't dug into it yet. > > 2) There's also an issue in clang where a large switch table had a bunch > of unused (bad) entries. It's not a code correctness issue, but > hopefully it can get fixed in clang anyway. See patch 20/22 for more > details. > > 3) CONFIG_LIVEPATCH is causing some objtool "unreachable instruction" > warnings due to the new -flive-patching flag. I have some fixes > pending, but this patch set is already long enough.
These patches are also at: git://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git objtool-many-fixes -- Josh
