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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2026-06-16 05:08:13 +0530 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2026-06-16 05:08:13 +0530 |
| commit | 25a01b5155d207e72bdd31b138406f37788403cb (patch) | |
| tree | d4b2c03475c65c0ef1ee88acfd671581ea96bbc4 /Documentation | |
| parent | 44308fbe8feb0861053b9173e3fda2849944b355 (diff) | |
| parent | 37540b8c287fc817bdbd0c62bb75ad6eab0e5d03 (diff) | |
| download | ath-25a01b5155d207e72bdd31b138406f37788403cb.tar.gz | |
Merge tag 's390-7.2-1' of gitolite.kernel.org:pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Alexander Gordeev:
- Use CIO device online variable instead of the internal FSM state to
determine device availability during purge operations
- Remove extra check of task_stack_page() because try_get_task_stack()
already takes care of that when reading /proc/<pid>/wchan
- Allow user-space to use the new SCLP action qualifier 4 for to
provide NVMe SMART log data to the platform.
- Send AP CHANGE uevents on successful bind and successful association
to notify user-space about SE operations on AP queue devices
- Add an s390dbf kernel parameter to configure debug log levels and
area sizes during early boot
- On arm64 the empty zero page is going to be mapped read-only. Do the
same for s390 with an explicit set_memory_ro() call
- Improve s390-specific bcr_serialize() and cpu_relax() implementations
- Remove all unused variables to avoid allmodconfig W=1 build fails
with latest clang-23
- Cleanup default Kconfig values for s390 selftests
- Add a s390-tod trace clock to allow comparing trace timestamps
between different systems or virtual machines on s390
- Remove the s390 implementation of strlcat() in favor of the generic
variant
- Make consistent the calling order between
page_table_check_pte_clear() and secure page conversion across all
code paths
- Rearrange some fields within AP and zcrypt structs to reduce memory
consumption and unused holes
- Shorten GR_NUM and VX_NUM macros and move them to a separate header
- Replace __get_free_page() with kmalloc() in few sources
- Introduce an infrastructure for more efficient this_cpu operations.
Eliminate conditional branches when PREEMPT_NONE is removed
- Enable Rust support
- Use z10 as minimum architecture level, similar to the boot code, to
enforce a defined architecture level set
- Improve and convert various mem*() helper functions to C. For that
add .noinstr.text section to avoid orphaned warnings from the linker
- Fix the function pointer type in __ret_from_fork() to correct the
indirect call to match kernel thread return type of int
- Revert support for DCACHE_WORD_ACCESS to avoid an endless exception
loop on read from donated Ultravisor pages at unaligned addresses
* tag 's390-7.2-1' of gitolite.kernel.org:pub/scm/linux/kernel/git/s390/linux: (52 commits)
s390: Revert support for DCACHE_WORD_ACCESS
s390/process: Fix kernel thread function pointer type
s390/tishift: Convert __ashlti3(), __ashrti3(), __lshrti3() to C
s390/memmove: Optimize backward copy case
s390/string: Convert memset(16|32|64)() to C
s390/string: Convert memcpy() to C
s390/string: Convert memset() to C
s390/string: Convert memmove() to C
s390/string: Add -ffreestanding compile option to string.o
s390: Add .noinstr.text to boot and purgatory linker scripts
s390/purgatory: Enforce z10 minimum architecture level
s390: Enable Rust support
s390/cmpxchg: Fix KASAN stack-out-of-bounds in atomic helpers
rust: helpers: Add memchr wrapper for string operations
rust/bindgen_parameters: Mark s390 types as opaque to prevent repr conflicts
s390/jump_label: Implement ARCH_STATIC_BRANCH_JUMP_ASM and ARCH_STATIC_BRANCH_ASM macros
s390/bug: Provide ARCH_WARN_ASM for Rust WARN/BUG support
s390/ap: Fix locking issue in SE bind and associate sysfs functions
s390/percpu: Provide arch_this_cpu_write() implementation
s390/percpu: Provide arch_this_cpu_read() implementation
...
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/arch/s390/s390dbf.rst | 30 | ||||
| -rw-r--r-- | Documentation/rust/arch-support.rst | 1 | ||||
| -rw-r--r-- | Documentation/trace/ftrace.rst | 4 |
3 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/arch/s390/s390dbf.rst b/Documentation/arch/s390/s390dbf.rst index aad6d88974fe5..034374c88dbaf 100644 --- a/Documentation/arch/s390/s390dbf.rst +++ b/Documentation/arch/s390/s390dbf.rst @@ -106,6 +106,36 @@ the ``debug_stoppable`` sysctl. If you set ``debug_stoppable`` to 0 the debug feature cannot be stopped. If the debug feature is already stopped, it will stay deactivated. +Kernel parameters +----------------- +The size and log levels of debug logs can be configured early during boot using +the ``s390dbf`` kernel parameter. The parameter accepts a debug log name, a log +level, and a log size, separated by colon characters (``:``). To configure only +a single attribute, either the log level or the log size may be omitted. + +To configure multiple debug logs, the parameter may be specified multiple times, +or multiple parameter sets may be provided in a single instance, separated by +commas. + +Parameter format:: + + s390dbf=<name|pattern>:[<level>|-]:[<pages>][,...] + +where: + +- ``name`` specifies either an exact debug log name or a shell-style wildcard + pattern +- ``level`` specifies the log level, or ``-`` to completely deactivate the log +- ``pages`` specifies the debug area size in pages + +Example:: + + s390dbf=cio*:6:128,sclp_err::2 + +This example sets the log level to 6 and the log size to 128 pages for all debug +logs whose names start with ``cio``. It also sets the log level of the +``sclp_err`` debug log to 2. + Kernel Interfaces: ------------------ diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst index 6e6a515d08991..4f980815e92a0 100644 --- a/Documentation/rust/arch-support.rst +++ b/Documentation/rust/arch-support.rst @@ -19,6 +19,7 @@ Architecture Level of support Constraints ``arm64`` Maintained Little Endian only. ``loongarch`` Maintained \- ``riscv`` Maintained ``riscv64`` and LLVM/Clang only. +``s390`` Maintained ``CONFIG_EXPOLINE`` must be disabled. ``um`` Maintained \- ``x86`` Maintained ``x86_64`` only. ============= ================ ============================================== diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst index 2ed1b96e440be..84f06bf0da9bc 100644 --- a/Documentation/trace/ftrace.rst +++ b/Documentation/trace/ftrace.rst @@ -570,6 +570,10 @@ of ftrace. Here is a list of some of the key files: to correlate events across hypervisor/guest if tb_offset is known. + s390-tod: + This uses the s390 TOD clock value. This clock is usually in + sync across virtual machines and STP-enabled machines. + mono: This uses the fast monotonic clock (CLOCK_MONOTONIC) which is monotonic and is subject to NTP rate adjustments. |