Better late than never, these patches add simplifications and improvements for some issues Peter found six months ago, as part of his non-writable text code (W^X) cleanups. Highlights: - Remove the livepatch arch-specific .klp.arch sections, which were used to do paravirt patching and alternatives patching for livepatch replacement code. - Add support for jump labels in patched code. - Remove the last module_disable_ro() usage. For more background, see this thread: https://lkml.kernel.org/r/20191021135312.jbbxsuipxldocdjk@treble I've tested this with a modified kpatch-build: https://github.com/jpoimboe/kpatch/tree/no-klp-arch (I'm planning to submit a github PR for kpatch-build, once I get the updated unit/integration tests sorted out. Josh Poimboeuf (4): livepatch: Apply vmlinux-specific KLP relocations early livepatch: Prevent module-specific KLP rela sections from referencing vmlinux symbols livepatch: Remove module_disable_ro() usage module: Remove module_disable_ro() Peter Zijlstra (3): livepatch: Remove .klp.arch s390/module: Use s390_kernel_write() for relocations x86/module: Use text_poke() for relocations Documentation/livepatch/module-elf-format.rst | 12 +- arch/s390/kernel/module.c | 106 +++++++++------ arch/um/kernel/um_arch.c | 16 +++ arch/x86/kernel/Makefile | 1 - arch/x86/kernel/livepatch.c | 53 -------- arch/x86/kernel/module.c | 34 ++++- include/linux/livepatch.h | 19 ++- include/linux/module.h | 2 - kernel/livepatch/core.c | 128 +++++++++++------- kernel/module.c | 22 +-- 10 files changed, 205 insertions(+), 188 deletions(-) delete mode 100644 arch/x86/kernel/livepatch.c -- 2.21.1
