kernel/linux.git/arch/um/include, branch v6.12.80

um: Re-evaluate thread flags repeatedly

2025-08-20T16:30:32+00:00

[ Upstream commit b9e2f2246eb2b5617d53af7b5e4e1b8c916f26a8 ] The thread flags may change during their processing. For example a task_work can queue a new signal to be sent. This signal should be delivered before returning to usespace again. Evaluate the flags repeatedly similar to other architectures. Signed-off-by: Thomas Weißschuh Reviewed-by: Nam Cao Link: https://patch.msgid.link/20250704-uml-thread_flags-v1-1-0e293fd8d627@linutronix.de Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin

um: Add cmpxchg8b_emu and checksum functions to asm-prototypes.h

2025-07-06T09:01:34+00:00

[ Upstream commit 674d03f6bd6b0f8327f1a4920ff5893557facfbd ] With CONFIG_GENDWARFKSYMS, um builds fail due to missing prototypes in asm/asm-prototypes.h. Add declarations for cmpxchg8b_emu and the exported checksum functions, including csum_partial_copy_generic as it's also exported. Cc: Masahiro Yamada Cc: linux-kbuild@vger.kernel.org Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202503251216.lE4t9Ikj-lkp@intel.com/ Signed-off-by: Sami Tolvanen Link: https://patch.msgid.link/20250326190500.847236-2-samitolvanen@google.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin

Revert "um: work around sched_yield not yielding in time-travel mode"

2025-05-18T06:24:57+00:00

This reverts commit da780c4a075ba2deb05ae29f0af4a990578c7901 which is commit 887c5c12e80c8424bd471122d2e8b6b462e12874 upstream. Reason being that the patch depends on at least commit 0b8b2668f998 ("um: insert scheduler ticks when userspace does not yield") in order to build. Otherwise it fails with: | /usr/bin/ld: arch/um/kernel/skas/syscall.o: in function `handle_syscall': | linux-6.12.27/arch/um/kernel/skas/syscall.c:43:(.text+0xa2): undefined | reference to `tt_extra_sched_jiffies' | collect2: error: ld returned 1 exit status The author Benjamin Berg commented: "I think it is better to just not backport commit 0b8b2668f998 ("um: insert scheduler ticks when userspace does not yield")" Link: https://lore.kernel.org/linux-um/8ce0b6056a9726e540f61bce77311278654219eb.camel@sipsolutions.net/ Cc: # 6.12.y Cc: Benjamin Berg Signed-off-by: Christian Lamparter Signed-off-by: Greg Kroah-Hartman

um: work around sched_yield not yielding in time-travel mode

2025-05-02T05:59:19+00:00

[ Upstream commit 887c5c12e80c8424bd471122d2e8b6b462e12874 ] sched_yield by a userspace may not actually cause scheduling in time-travel mode as no time has passed. In the case seen it appears to be a badly implemented userspace spinlock in ASAN. Unfortunately, with time-travel it causes an extreme slowdown or even deadlock depending on the kernel configuration (CONFIG_UML_MAX_USERSPACE_ITERATIONS). Work around it by accounting time to the process whenever it executes a sched_yield syscall. Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20250314130815.226872-1-benjamin@sipsolutions.net Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin

um: remove copy_from_kernel_nofault_allowed

2025-04-10T12:39:25+00:00

[ Upstream commit 84a6fc378471fbeaf48f8604566a5a33a3d63c18 ] There is no need to override the default version of this function anymore as UML now has proper _nofault memory access functions. Doing this also fixes the fact that the implementation was incorrect as using mincore() will incorrectly flag pages as inaccessible if they were swapped out by the host. Fixes: f75b1b1bedfb ("um: Implement probe_kernel_read()") Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20250210160926.420133-3-benjamin@sipsolutions.net Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin

move asm/unaligned.h to linux/unaligned.h

2024-10-02T21:23:23+00:00

asm/unaligned.h is always an include of asm-generic/unaligned.h; might as well move that thing to linux/unaligned.h and include that - there's nothing arch-specific in that header. auto-generated by the following: for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $i done for i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $i done git mv include/asm-generic/unaligned.h include/linux/unaligned.h git mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.h sed -i -e "/unaligned.h/d" include/asm-generic/Kbuild sed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h

um: Remove outdated asm/sysrq.h header

2024-09-12T18:44:11+00:00

This header no longer serves a purpose after show_trace was removed by commit 9d1ee8ce92e1 ("um: Rewrite show_stack()"). Signed-off-by: Tiwei Bie Signed-off-by: Richard Weinberger

um: Remove the declaration of user_thread function

2024-09-12T18:43:26+00:00

This function has never been defined since its declaration was introduced by commit 1da177e4c3f4 ("Linux-2.6.12-rc2"). Signed-off-by: Tiwei Bie Signed-off-by: Richard Weinberger

um: Remove unused mm_fd field from mm_id

2024-09-12T18:36:22+00:00

It's no longer used since the removal of the SKAS3/4 support. Signed-off-by: Tiwei Bie Signed-off-by: Richard Weinberger

um: Remove unused fields from thread_struct

2024-09-12T18:35:35+00:00

These fields are no longer used since the removal of tt mode. Signed-off-by: Tiwei Bie Signed-off-by: Richard Weinberger