kernel/linux.git/arch/um/include/asm, branch v6.12.93Linux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=v6.12.932026-06-09T10:26:03+00:00ring-buffer: Flush and stop persistent ring buffer on panic2026-06-09T10:26:03+00:00Masami Hiramatsu (Google)mhiramat@kernel.org2026-05-30T01:02:19+00:00urn:sha1:dc518afa8eb71ffb7bcf8aef0ce2d9338df87d07
[ Upstream commit a494d3c8d5392bcdff83c2a593df0c160ff9f322 ]
On real hardware, panic and machine reboot may not flush hardware cache
to memory. This means the persistent ring buffer, which relies on a
coherent state of memory, may not have its events written to the buffer
and they may be lost. Moreover, there may be inconsistency with the
counters which are used for validation of the integrity of the
persistent ring buffer which may cause all data to be discarded.
To avoid this issue, stop recording of the ring buffer on panic and
flush the cache of the ring buffer's memory.
Fixes: e645535a954a ("tracing: Add option to use memmapped memory for trace boot instance")
Cc: stable@vger.kernel.org
Cc: Will Deacon <will@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Ian Rogers <irogers@google.com>
Link: https://patch.msgid.link/177751969602.2136606.12031934362587643488.stgit@mhiramat.tok.corp.google.com
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
um: Re-evaluate thread flags repeatedly2025-08-20T16:30:32+00:00Thomas Weißschuhthomas.weissschuh@linutronix.de2025-07-04T12:34:47+00:00urn:sha1:0cfcc16ecd0250978ef419e35740156a85a8ea17
[ 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 <thomas.weissschuh@linutronix.de>
Reviewed-by: Nam Cao <namcao@linutronix.de>
Link: https://patch.msgid.link/20250704-uml-thread_flags-v1-1-0e293fd8d627@linutronix.de
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
um: Add cmpxchg8b_emu and checksum functions to asm-prototypes.h2025-07-06T09:01:34+00:00Sami Tolvanensamitolvanen@google.com2025-03-26T19:05:00+00:00urn:sha1:4f95f49d2bd02f4e4c2e97d4793ee83d0a5a3831
[ 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 <masahiroy@kernel.org>
Cc: linux-kbuild@vger.kernel.org
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503251216.lE4t9Ikj-lkp@intel.com/
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://patch.msgid.link/20250326190500.847236-2-samitolvanen@google.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
move asm/unaligned.h to linux/unaligned.h2024-10-02T21:23:23+00:00Al Viroviro@zeniv.linux.org.uk2024-10-01T19:35:57+00:00urn:sha1:5f60d5f6bbc12e782fac78110b0ee62698f3b576
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 header2024-09-12T18:44:11+00:00Tiwei Bietiwei.btw@antgroup.com2024-08-26T10:08:15+00:00urn:sha1:ae0dc67c2512e09fee26226e1b2d78b82ebebf66
This header no longer serves a purpose after show_trace was removed
by commit 9d1ee8ce92e1 ("um: Rewrite show_stack()").
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Remove unused fields from thread_struct2024-09-12T18:35:35+00:00Tiwei Bietiwei.btw@antgroup.com2024-08-26T10:08:11+00:00urn:sha1:94090f418fc80c50ca7ea3f8a6d7ff547260a801
These fields are no longer used since the removal of tt mode.
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Remove unused kpte_clear_flush macro2024-09-12T18:32:55+00:00Tiwei Bietiwei.btw@antgroup.com2024-08-26T10:08:09+00:00urn:sha1:2fcd16fbab9f448c7174bf4c3eeda53ef84e28ee
This macro has no users, and __flush_tlb_one doesn't exist either.
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Merge tag 'uml-for-linus-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux2024-07-25T19:33:08+00:00Linus Torvaldstorvalds@linux-foundation.org2024-07-25T19:33:08+00:00urn:sha1:f9bcc61ad1fbe7dbc6bdd71d31254e429100a009
Pull UML updates from Richard Weinberger:
- Support for preemption
- i386 Rust support
- Huge cleanup by Benjamin Berg
- UBSAN support
- Removal of dead code
* tag 'uml-for-linus-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: (41 commits)
um: vector: always reset vp->opened
um: vector: remove vp->lock
um: register power-off handler
um: line: always fill *error_out in setup_one_line()
um: remove pcap driver from documentation
um: Enable preemption in UML
um: refactor TLB update handling
um: simplify and consolidate TLB updates
um: remove force_flush_all from fork_handler
um: Do not flush MM in flush_thread
um: Delay flushing syscalls until the thread is restarted
um: remove copy_context_skas0
um: remove LDT support
um: compress memory related stub syscalls while adding them
um: Rework syscall handling
um: Add generic stub_syscall6 function
um: Create signal stack memory assignment in stub_data
um: Remove stub-data.h include from common-offsets.h
um: time-travel: fix signal blocking race/hang
um: time-travel: remove time_exit()
...
um: Use generic runtime constant implementation2024-07-17T00:25:59+00:00Linus Torvaldstorvalds@linux-foundation.org2024-07-17T00:25:59+00:00urn:sha1:17e6a1213058d8759bcf043151c04612df55ebc4
UML should not be using the architecture native runtime constants, since
that requires also having the appropriate instruction fixups (and all
the linker script details).
Not that using that code would be impossible, but it's not worth it.
Just point UML at the generic version.
Reported-by: Nathan Chancellor <nathan@kernel.org>
Fixes: e3c92e81711d ("runtime constants: add x86 architecture support")
Link: https://lore.kernel.org/all/20240716143644.GA1827132@thelio-3990X/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
um: don't generate asm/bpf_perf_event.h2024-07-10T12:23:30+00:00Arnd Bergmannarnd@arndb.de2024-05-13T17:13:55+00:00urn:sha1:0dd0e9437f8e500a384f12ec16bb407a49676147
If we start validating the existence of the asm-generic side of
generated headers, this one causes a warning:
make[3]: *** No rule to make target 'arch/um/include/generated/asm/bpf_perf_event.h', needed by 'all'. Stop.
The problem is that the asm-generic header only exists for the uapi
variant, but arch/um has no uapi headers and instead uses the x86
userspace API.
Add a custom file with an explicit redirect to avoid this.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>