kernel/git/stable/linux.git/arch/s390/lib, branch master

Merge tag 's390-7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2026-08-23T17:26:44+00:00

Pull s390 updates from Vasily Gorbik: - Add a cpuidle driver with polling and enabled wait states using the existing CPU idle infrastructure and idle governor to improve latency for frequent sleep/wakeup cycles. Remove the obsolete tick delay heuristic and generic arch_needs_cpu() hook. Add the corresponding driver entry to MAINTAINERS - Add kCFI support using the generic support provided by Clang - Enable Clang CONTEXT_ANALYSIS for various architecture code and for char, PCI, CIO and virtio drivers. Add required lock annotations, exclude unsupported mm helpers and remove conditional PCI locking - Fix secure storage access exception handling and reintroduce DCACHE_WORD_ACCESS previously removed as a workaround - Fix cpum_cf perf crashes when CPUs are brought online while per-task events are active. Allocate and remove per-CPU counter data from CPU hotplug callbacks - Fix a deadlock when an s390dbf debug area is unregistered while one of its debugfs files is being written to - Fix MVIY_PERCPU() with binutils older than 2.39, where an assembler macro silently omitted an instruction needed to repair interrupted operations after CPU migration - Remove/replace cond_resched() calls which are no-ops with the supported s390 preemption models - Fix AP queue depth and maximum message length decoding according to the architecture. Current hardware is not affected, but future hardware could report values which were handled incorrectly - Reflect the configured CPU state in cpu_enabled_mask so deconfigured CPUs are not presented as available for onlining - Restore the vDSO GNU_EH_FRAME program header which was lost when the build switched to direct linker invocation, and mark it read-only - Add SCLP action qualifiers used by Spyre for card initialization, recoverable error and telemetry reporting - Move KMSAN interrupt flag helpers out of line to fix -Wstatic-in-inline build warnings - Use level-specific page table entry accessors for hugetlb entries and ptep_get() when accessing crashed kernel memory in kdump - Make forced AP bus rescans killable so that a user process blocked behind an ongoing scan can still be terminated with SIGKILL - Rework pkey ioctl error paths to remove duplicated cleanup code and avoid freeing error pointers - Allow the protected guest SWIOTLB buffer to be allocated outside the first 2GB. Also enable dynamic SWIOTLB growth and the coherent atomic pool fallback to improve I/O behavior when the initial pool is exhausted - Add program check statistics and spinlock contention tracepoints. Increase the lockdep chain capacity to keep lockdep enabled for complex code paths such as btrfs - Simplify IPL, trap and syscall code and remove the obsolete unistd_32.h generation entry * tag 's390-7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (59 commits) s390/percpu: Fix MVIY_PERCPU() with older binutils s390/debug: Fix deadlock during unregister s390/cpum_cf: Handle CPU hotplug via prepare/dead callbacks s390: Enable CONTEXT_ANALYSIS for various directories s390/mm: Add __context_unsafe() attribute to gmap helper functions s390/mm: Add __context_unsafe() attribute to do_secure_storage_access() s390/sysinfo: Add context analysis attributes s390/irqflags: Add out-of-line definitions of arch_local_irq_*() for KMSAN s390/virtio: Enable CONTEXT_ANALYSIS s390/cio: Enable CONTEXT_ANALYSIS s390/vfio_ccw: Add __must_hold() attribute to vfio_ccw_sch_quiesce() s390/pci: Enable CONTEXT_ANALYSIS s390/pci: Rework __zpci_event_availability() to remove conditional locking s390/pci: Rework __zpci_event_error() to remove conditional locking s390/char: Enable CONTEXT_ANALYSIS s390/con3215: Add __must_hold() attribute to raw3215_make_room() s390/ap: Fix MAPML computation s390/cio: Remove cond_resched() calls s390: Remove cond_resched() calls KVM: s390: Remove cond_resched() calls ...

s390: Enable CONTEXT_ANALYSIS for various directories

2026-08-11T14:42:18+00:00

Enable CONTEXT_ANALYSIS for various directories which do not generate any warnings (anymore). Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/spinlock: Add contention tracepoints to lock slowpath

2026-07-29T22:29:09+00:00

Instrument arch_spin_lock_wait() with trace_contention_begin() and trace_contention_end(). These tracepoints are used by lock contention analysis tools such as perf lock contention to identify contended locks and measure wait times. Both the generic implementation and powerpc emit the same events from their spinlock slow path. Place the tracepoints in arch_spin_lock_wait(), which is only entered when lock acquisition falls back to the contention path. Acked-by: Heiko Carstens Signed-off-by: Ciunas Bennett Signed-off-by: Vasily Gorbik

s390/checksum: Fix csum_partial() without vector facility

2026-07-15T15:35:42+00:00

Currently csum_partial() calls csum_copy() with copy=false and dst=NULL. On machines without the vector facility, csum_copy() falls back to cksm(dst, ...), causing the checksum to be calculated from address zero instead of the source buffer. The VX implementation already checksums data loaded from src. Make the fallback do the same by passing src to cksm(). Fixes: dcd3e1de9d17 ("s390/checksum: provide csum_partial_copy_nocheck()") Reviewed-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/tishift: Convert ashlti3(), ashrti3(), __lshrti3() to C

2026-06-10T14:55:22+00:00

There is no reason to have __ashlti3(), __ashrti3(), and __lshrti3() implemented in assembler. Convert them all to C, which allows the compiler to optimize the code if newer instructions allow that. Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390/memmove: Optimize backward copy case

2026-06-10T14:55:21+00:00

memmove() copies byte wise for the backward copy case, when the mvc instruction cannot be used. This is quite slow, but can be optimized with the mvcrl instruction, which is available since z15. Some numbers (measured on a shared z16 LPAR) show that the new implementation is nearly always faster, except for the non realistic one and two byte cases: size old new 1 2ns 3ns 2 4ns 5ns 4 5ns 5ns 8 8ns 5ns 16 12ns 6ns 32 8ns 7ns 64 15ns 7ns 128 31ns 9ns 256 64ns 10ns 512 129ns 18ns 1024 250ns 19ns 2048 498ns 38ns Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390/string: Convert memset(16|32|64)() to C

2026-06-10T14:55:21+00:00

Convert memset(16|32|64)() from assembler to C, which should make it easier to read and change, if required. And it allows the compiler to optimize the code, and use different instructions, except for the used inline assemblies. Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390/string: Convert memcpy() to C

2026-06-10T14:55:21+00:00

Convert memcpy() from assembler to C, which should make it easier to read and change, if required. And it allows the compiler to optimize the code, and use different instructions, except for the used inline assemblies. Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390/string: Convert memset() to C

2026-06-10T14:55:21+00:00

Convert memset() from assembler to C, which should make it easier to read and change, if required. And it allows the compiler to optimize the code, and use different instructions, except for the used inline assemblies. Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390/string: Convert memmove() to C

2026-06-10T14:55:20+00:00

Convert memmove() from assembler to C, which should make it easier to read and change, if required. And it allows the compiler to optimize the code, and use different instructions, except for the used inline assemblies. Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

kernel/git/stable/linux.git/arch/s390/lib, branch master

Merge tag 's390-7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

s390: Enable CONTEXT_ANALYSIS for various directories

s390/spinlock: Add contention tracepoints to lock slowpath

s390/checksum: Fix csum_partial() without vector facility

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/tishift: Convert ashlti3(), ashrti3(), __lshrti3() to C