kernel/linux.git/arch/x86/include/asm/thread_info.h, branch v7.1

x86/xen: use lazy_mmu_state when context-switching

2026-01-21T03:24:35+00:00

We currently set a TIF flag when scheduling out a task that is in lazy MMU mode, in order to restore it when the task is scheduled again. The generic lazy_mmu layer now tracks whether a task is in lazy MMU mode in task_struct::lazy_mmu_state. We can therefore check that state when switching to the new task, instead of using a separate TIF flag. Link: https://lkml.kernel.org/r/20251215150323.2218608-14-kevin.brodsky@arm.com Signed-off-by: Kevin Brodsky Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Juergen Gross Reviewed-by: Yeoreum Yun Cc: Alexander Gordeev Cc: Andreas Larsson Cc: Anshuman Khandual Cc: Borislav Betkov Cc: Boris Ostrovsky Cc: Catalin Marinas Cc: Christophe Leroy Cc: David Hildenbrand Cc: David S. Miller Cc: David Woodhouse Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Jann Horn Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Michal Hocko Cc: Mike Rapoport Cc: Nicholas Piggin Cc: Peter Zijlstra Cc: Ritesh Harjani (IBM) Cc: Ryan Roberts Cc: Suren Baghdasaryan Cc: Thomas Gleinxer Cc: Venkat Rao Bagalkote Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton

x86: Use generic TIF bits

2025-09-17T06:14:04+00:00

No point in defining generic items and the upcoming RSEQ optimizations are only available with this _and_ the generic entry infrastructure, which is already used by x86. So no further action required here. Signed-off-by: Thomas Gleixner Reviewed-by: Mathieu Desnoyers

x86/headers: Replace ASSEMBLY with ASSEMBLER in non-UAPI headers

2025-03-19T10:47:30+00:00

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with UAPI headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is mostly a mechanical patch (done with a simple "sed -i" statement), with some manual tweaks in , and that mentioned this macro in comments with some missing underscores. Signed-off-by: Thomas Huth Signed-off-by: Ingo Molnar Cc: Brian Gerst Cc: Juergen Gross Cc: H. Peter Anvin Cc: Kees Cook Cc: Linus Torvalds Link: https://lore.kernel.org/r/20250314071013.1575167-38-thuth@redhat.com

sched, x86: Update the comment for TIF_NEED_RESCHED_LAZY.

2024-11-11T10:49:45+00:00

Add the "Lazy" part to the comment for TIF_NEED_RESCHED_LAZY so it is not the same as TIF_NEED_RESCHED. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20241106162449.sk6rDddk@linutronix.de

sched, x86: Enable Lazy preemption

2024-11-05T11:55:38+00:00

Add the TIF bit and select the Kconfig symbol to make it go. Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Sebastian Andrzej Siewior Link: https://lkml.kernel.org/r/20241007075055.555778919@infradead.org

x86/fred: Reserve space for the FRED stack frame

2024-01-31T21:01:31+00:00

When using FRED, reserve space at the top of the stack frame, just like i386 does. Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Xin Li Signed-off-by: Thomas Gleixner Signed-off-by: Borislav Petkov (AMD) Tested-by: Shan Kang Link: https://lore.kernel.org/r/20231205105030.8698-17-xin3.li@intel.com

thread_info: move function declarations to linux/thread_info.h

2023-06-10T00:44:16+00:00

There are a few __weak functions in kernel/fork.c, which architectures can override. If there is no prototype, the compiler warns about them: kernel/fork.c:164:13: error: no previous prototype for 'arch_release_task_struct' [-Werror=missing-prototypes] kernel/fork.c:991:20: error: no previous prototype for 'arch_task_cache_init' [-Werror=missing-prototypes] kernel/fork.c:1086:12: error: no previous prototype for 'arch_dup_task_struct' [-Werror=missing-prototypes] There are already prototypes in a number of architecture specific headers that have addressed those warnings before, but it's much better to have these in a single place so the warning no longer shows up anywhere. Link: https://lkml.kernel.org/r/20230517131102.934196-14-arnd@kernel.org Signed-off-by: Arnd Bergmann Cc: Boqun Feng Cc: Catalin Marinas Cc: Christoph Lameter Cc: Dennis Zhou Cc: Eric Paris Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Paul Moore Cc: Pavel Machek Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Russell King Cc: Tejun Heo Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Waiman Long Cc: Will Deacon Signed-off-by: Andrew Morton

x86: Suppress KMSAN reports in arch_within_stack_frames()

2023-01-27T17:00:56+00:00

arch_within_stack_frames() performs stack walking and may confuse KMSAN by stepping on stale shadow values. To prevent false positive reports, disable KMSAN checks in this function. This fixes KMSAN's interoperability with CONFIG_HARDENED_USERCOPY. Signed-off-by: Alexander Potapenko Signed-off-by: Dave Hansen Tested-by: Eric Biggers Link: https://github.com/google/kmsan/issues/89 Link: https://lore.kernel.org/lkml/Y3b9AAEKp2Vr3e6O@sol.localdomain/ Link: https://lore.kernel.org/all/20221118172305.3321253-1-glider%40google.com

x86/split-lock: Remove unused TIF_SLD bit

2022-04-27T13:43:39+00:00

Changes to the "warn" mode of split lock handling mean that TIF_SLD is never set. Remove the bit, and the functions that use it. Signed-off-by: Tony Luck Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20220310204854.31752-3-tony.luck@intel.com

x86: add CPU field to struct thread_info

2021-09-30T12:40:30+00:00

The CPU field will be moved back into thread_info even when THREAD_INFO_IN_TASK is enabled, so add it back to x86's definition of struct thread_info. Signed-off-by: Ard Biesheuvel Acked-by: Borislav Petkov Acked-by: Mark Rutland