On Wed, 26 Jan 2022 at 21:05, Alan Maguire <alan.maguire@xxxxxxxxxx> wrote: > > > Regressions detected on arm, arm64, i386, x86 on 5.15 and 5.10 > > > > > > > > > > This is one from arm64: > > > > /builds/linux/arch/arm64/mm/extable.c: In function 'fixup_exception': > > > > /builds/linux/arch/arm64/mm/extable.c:17:13: error: implicit declaration of function 'in_bpf_jit' [-Werror=implicit-function-declaration] > > > > 17 | if (in_bpf_jit(regs)) > > > > | ^~~~~~~~~~ > > > > cc1: some warnings being treated as errors > > > > make[3]: *** [/builds/linux/scripts/Makefile.build:277: arch/arm64/mm/extable.o] Error 1 > > > > > > Bisection here pointed to "arm64/bpf: Remove 128MB limit for BPF JIT programs". Reverting made the build succeed. > > > > arm64/bpf: Remove 128MB limit for BPF JIT programs > > commit b89ddf4cca43f1269093942cf5c4e457fd45c335 upstream. > > > > Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> > > > > Thanks for the report! > > This one needs slightly different handling on 5.15. Russell had a 5.15 > patch for this (where BPF exception handling was still handled separately) > and I've included it below. I verified it applies cleanly to the > linux-5.15.y branch and builds. I'd suggest either skipping backport of > this fix to stable completely, or just applying the below to 5.15 and > skipping further backports. Build test pass with this patch on stable/linux-5.15.y. I have not run any tests. - Naresh
