On Tue, Feb 21, 2023 at 12:48:05PM -0700, Nathan Chancellor wrote:

Hi Greg and Sasha,

Please consider applying the following commits to 6.2 (they apply cleanly with some fuzz for me):

db7adcfd1cec ("x86/alternatives: Introduce int3_emulate_jcc()") ac0ee0a9560c ("x86/alternatives: Teach text_poke_bp() to patch Jcc.d32 instructions") 923510c88d2b ("x86/static_call: Add support for Jcc tail-calls")

I have attached backports to 6.1.

Without these changes, kernels built with any version of clang using -Os or clang 17.0.0 (tip of tree) at any kernel-supported optimization level do not boot. This has been tested by people affected by this problem, see https://github.com/ClangBuiltLinux/linux/issues/1774 for more info.

If there are any problems, please let me know.

Cheers, Nathan

All now queued up,t hanks.

greg k-h