kernel/linux.git/arch/um/include, branch v6.19.11

Merge tag 'objtool-urgent-2025-12-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-12-06T19:56:51+00:00

Pull objtool fixes from Ingo Molnar: "Address various objtool scalability bugs/inefficiencies exposed by allmodconfig builds, plus improve the quality of alternatives instructions generated code and disassembly" * tag 'objtool-urgent-2025-12-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool: Simplify .annotate_insn code generation output some more objtool: Add more robust signal error handling, detect and warn about stack overflows objtool: Remove newlines and tabs from annotation macros objtool: Consolidate annotation macros x86/asm: Remove ANNOTATE_DATA_SPECIAL usage x86/alternative: Remove ANNOTATE_DATA_SPECIAL usage objtool: Fix stack overflow in validate_branch()

x86/asm: Remove ANNOTATE_DATA_SPECIAL usage

2025-12-03T15:53:19+00:00

Instead of manually annotating each __ex_table entry, just make the section mergeable and store the entry size in the ELF section header. Either way works for objtool create_fake_symbols(), this way produces cleaner code generation. Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Linus Torvalds Link: https://patch.msgid.link/b858cb7891c1ba0080e22a9c32595e6c302435e2.1764694625.git.jpoimboe@kernel.org

x86/alternative: Remove ANNOTATE_DATA_SPECIAL usage

2025-12-03T15:53:19+00:00

Instead of manually annotating each .altinstructions entry, just make the section mergeable and store the entry size in the ELF section header. Either way works for objtool create_fake_symbols(), this way produces cleaner code generation. Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Linus Torvalds Link: https://patch.msgid.link/5ac04e6db5be6453dce8003a771ebb0c47b4cd7a.1764694625.git.jpoimboe@kernel.org

um: Disable KASAN_INLINE when STATIC_LINK is selected

2025-12-01T10:54:50+00:00

um doesn't support KASAN_INLINE together with STATIC_LINK. Instead of failing the build, disable KASAN_INLINE when STATIC_LINK is selected. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202511290451.x9GZVJ1l-lkp@intel.com/ Fixes: 1e338f4d99e6 ("kasan: introduce ARCH_DEFER_KASAN and unify static key across modes") Signed-off-by: Christophe Leroy (CS GROUP) Link: https://patch.msgid.link/2620ab0bbba640b6237c50b9c0dca1c7d1142f5d.1764410067.git.chleroy@kernel.org Signed-off-by: Johannes Berg

um: Remove __access_ok_vsyscall()

2025-11-06T12:02:34+00:00

FIXADDR_USER_START and FIXADDR_USER_END are now always zero. Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20251028-uml-remove-32bit-pseudo-vdso-v1-8-e930063eff5f@weissschuh.net Signed-off-by: Johannes Berg

um: Remove redundant range check from __access_ok_vsyscall()

2025-11-06T12:02:33+00:00

The only caller __access_ok() is already doing the same check through __addr_range_nowrap(). Remove the redundant check. Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20251028-uml-remove-32bit-pseudo-vdso-v1-7-e930063eff5f@weissschuh.net Signed-off-by: Johannes Berg

x86/um: Drop gate area handling

2025-11-06T12:02:33+00:00

With the removal of the vDSO passthrough from the host, FIXADDR_USER_START is always 0 and the gate area setup code is dead. Remove it. Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20251028-uml-remove-32bit-pseudo-vdso-v1-5-e930063eff5f@weissschuh.net Signed-off-by: Johannes Berg

um: Avoid circular dependency on asm-offsets in pgtable.h

2025-10-28T10:40:49+00:00

Recent changes have added an include of as-layout.h to pgtable.h. However this introduces a circular dependency during asm-offsets generation as as-layout.h depends on asm-offsets and pgtable.h is an input for asm-offsets. Building from a clean state results in the following error: CC arch/um/kernel/asm-offsets.s In file included from arch/um/include/asm/pgtable.h:48, from include/linux/pgtable.h:6, from include/linux/mm.h:31, from include/linux/pid_namespace.h:7, from include/linux/ptrace.h:10, from include/linux/audit.h:13, from arch/um/kernel/asm-offsets.c:8: arch/um/include/shared/as-layout.h:9:10: fatal error: generated/asm-offsets.h: No such file or directory 9 | #include | ^~~~~~~~~~~~~~~~~~~~~~~~~ compilation terminated. make[4]: *** [scripts/Makefile.build:182: arch/um/kernel/asm-offsets.s] Error 1 As the inclusion of as-layout.h in pgtable.h is not yet needed while asm-offsets are generated, break the dependency here. Fixes: a7f7dbae94a5 ("um: Remove file-based iomem emulation support") Signed-off-by: Thomas Weißschuh Reviewed-by: Tiwei Bie Link: https://patch.msgid.link/20251028-uml-offsets-circular-v1-1-601c363cfaaa@weissschuh.net Signed-off-by: Johannes Berg

um: Add initial SMP support

2025-10-27T15:41:15+00:00

Add initial symmetric multi-processing (SMP) support to UML. With this support enabled, users can tell UML to start multiple virtual processors, each represented as a separate host thread. In UML, kthreads and normal threads (when running in kernel mode) can be scheduled and executed simultaneously on different virtual processors. However, the userspace code of normal threads still runs within their respective single-threaded stubs. That is, SMP support is currently available both within the kernel and across different processes, but still remains limited within threads of the same process in userspace. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20251027001815.1666872-6-tiwei.bie@linux.dev Signed-off-by: Johannes Berg

um: Define timers on a per-CPU basis

2025-10-27T15:41:15+00:00

Define timers on a per-CPU basis to enable each CPU to have its own timer. This is a preparation for adding SMP support. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20251027001815.1666872-5-tiwei.bie@linux.dev Signed-off-by: Johannes Berg