Tags

pull-work.lseek

	Saner handling of "lseek should fail with ESPIPE" - gets rid of
magical no_llseek thing and makes checks consistent.  In particular,
ad-hoc "can we do splice via internal pipe" checks got saner (and
somewhat more permissive, which is what Jason had been after, AFAICT)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

pull-work.namei

	RCU pathwalk cleanups.  Storing sampled ->d_seq of
the next dentry in nameidata simplifies life considerably,
especially if we delay fetching ->d_inode until step_into().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

x86_kdump_for_v6.0_rc1

- Add the ability to pass early an RNG seed to the kernel from the boot
loader

- Add the ability to pass the IMA measurement of kernel and bootloader
to the kexec-ed kernel

timers-core-2022-08-01

Timers, timekeeping and related drivers update:

 core:
   - Make wait_event_hrtimeout() ware of RT/DL tasks

 drivers:
   - New driver for the R-Car Gen4 timer
   - New driver for the Tegra186 timer
   - New driver for the Mediatek MT6795 CPUXGPT timer

   - Rework suspend/resume handling in timer drivers so it
     takes inactive clocks into account.

   - The usual device tree compatible add ons

   - Small fixed and cleanups all over the place

irq-core-2022-08-01

Updates for interrupt core and drivers:

 core:
   - Fix a few inconsistencies between UP and SMP vs. interrupt affinities
   - Small updates and cleanups all over the place

 drivers:
   - New driver for the LoongArch interrupt controller
   - New driver for the Renesas RZ/G2L interrupt controller

   - Hotpath optimization for SiFive PLIC
   - Workaround for broken PLIC edge triggered interrupts

   - Simall cleanups and improvements as usual

perf-core-2022-08-01

Perf events updates for this cycle are:

- Fix Intel Alder Lake PEBS memory access latency & data source profiling info bugs.

- Use Intel large-PEBS hardware feature in more circumstances, to reduce
  PMI overhead & reduce sampling data.

- Extend the lost-sample profiling output with the PERF_FORMAT_LOST ABI variant,
  which tells tooling the exact number of samples lost.

- Add new IBS register bits definitions.

- AMD uncore events: Add PerfMonV2 DF (Data Fabric) enhancements.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

locking-core-2022-08-01

This was a fairly quiet cycle for the locking subsystem:

 - lockdep: Fix a handful of the more complex lockdep_init_map_*() primitives
   that can lose the lock_type & cause false reports. No such mishap was
   observed in the wild.

 - jump_label improvements: simplify the cross-arch support of
   initial NOP patching by making it arch-specific code (used on MIPS only),
   and remove the s390 initial NOP patching that was superfluous.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

sched-core-2022-08-01

This cycle's scheduler updates for v6.0 are:

Load-balancing improvements:
============================

- Improve NUMA balancing on AMD Zen systems for affine workloads.

- Improve the handling of reduced-capacity CPUs in load-balancing.

- Energy Model improvements: fix & refine all the energy fairness metrics (PELT),
  and remove the conservative threshold requiring 6% energy savings to
  migrate a task. Doing this improves power efficiency for most workloads,
  and also increases the reliability of energy-efficiency scheduling.

- Optimize/tweak select_idle_cpu() to spend (much) less time searching
  for an idle CPU on overloaded systems. There's reports of several
  milliseconds spent there on large systems with large workloads ...

  [ Since the search logic changed, there might be behavioral side effects. ]

- Improve NUMA imbalance behavior. On certain systems
  with spare capacity, initial placement of tasks is non-deterministic,
  and such an artificial placement imbalance can persist for a long time,
  hurting (and sometimes helping) performance.

  The fix is to make fork-time task placement consistent with runtime
  NUMA balancing placement.

  Note that some performance regressions were reported against this,
  caused by workloads that are not memory bandwith limited, which benefit
  from the artificial locality of the placement bug(s). Mel Gorman's
  conclusion, with which we concur, was that consistency is better than
  random workload benefits from non-deterministic bugs:

     "Given there is no crystal ball and it's a tradeoff, I think it's
      better to be consistent and use similar logic at both fork time
      and runtime even if it doesn't have universal benefit."

- Improve core scheduling by fixing a bug in sched_core_update_cookie() that
  caused unnecessary forced idling.

- Improve wakeup-balancing by allowing same-LLC wakeup of idle CPUs for newly
  woken tasks.

- Fix a newidle balancing bug that introduced unnecessary wakeup latencies.

ABI improvements/fixes:
=======================

- Do not check capabilities and do not issue capability check denial messages
  when a scheduler syscall doesn't require privileges. (Such as increasing niceness.)

- Add forced-idle accounting to cgroups too.

- Fix/improve the RSEQ ABI to not just silently accept unknown flags.
  (No existing tooling is known to have learned to rely on the previous behavior.)

- Depreciate the (unused) RSEQ_CS_FLAG_NO_RESTART_ON_* flags.

Optimizations:
==============

- Optimize & simplify leaf_cfs_rq_list()

- Micro-optimize set_nr_{and_not,if}_polling() via try_cmpxchg().

Misc fixes & cleanups:
======================

- Fix the RSEQ self-tests on RISC-V and Glibc 2.35 systems.

- Fix a full-NOHZ bug that can in some cases result in the tick not being
  re-enabled when the last SCHED_RT task is gone from a runqueue but there's
  still SCHED_OTHER tasks around.

- Various PREEMPT_RT related fixes.

- Misc cleanups & smaller fixes.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

x86_build_for_v6.0_rc1

- Fix stack protector builds when cross compiling with Clang

- Other Kbuild improvements and fixes

x86_core_for_v6.0_rc1

- Have invalid MSR accesses warnings appear only once after a
pr_warn_once() change broke that

- Simplify {JMP,CALL}_NOSPEC and let the objtool retpoline patching
infra take care of them instead of having unreadable alternative macros
there

x86_misc_for_v6.0_rc1

- Add a bunch of PCI IDs for new AMD CPUs and use them in k10temp

- Free the pmem platform device on the registration error path

x86_cpu_for_v6.0_rc1

- Remove the vendor check when selecting MWAIT as the default idle state

- Respect idle=nomwait when supplied on the kernel cmdline

- Two small cleanups

x86_fpu_for_v6.0_rc1

- Add machinery to initialize AMX register state in order for CPUs to
be able to enter deeper low-power state

x86_mm_for_v6.0_rc1

- Rename a PKRU macro to make more sense when reading the code

- Update pkeys documentation

- Avoid reading contended mm's TLB generation var if not absolutely
necessary along with fixing a case where arch_tlbbatch_flush() doesn't
adhere to the generation scheme and thus violates the conditions for the
above avoidance.

x86_cleanups_for_v6.0_rc1

- A single CONFIG_ symbol correction in a comment

x86_vmware_for_v6.0_rc1

- A single statement simplification by using the BIT() macro

ras_core_for_v6.0_rc1

- Probe whether hardware error injection (direct MSR writes) is possible
when injecting errors on AMD platforms. In some cases, the platform
could prohibit those.

d1/sram-support-v1

v5.19

Linux 5.19

xfs-5.20-merge-6

New code for 5.20:
- Improve scalability of the XFS log by removing spinlocks and global
  synchronization points.
- Add security labels to whiteout inodes to match the other filesystems.
- Clean up per-ag pointer passing to simplify call sites.
- Reduce verifier overhead by precalculating more AG geometry.
- Implement fast-path lockless lookups in the buffer cache to reduce
  spinlock hammering.
- Make attr forks a permanent part of the inode structure to fix a UAF
  bug and because most files these days tend to have security labels and
  soon will have parent pointers too.
- Clean up XFS_IFORK_Q usage and give it a better name.
- Fix more UAF bugs in the xattr code.
- SOB my tags.
- Fix some typos in the timestamp range documentation.
- Fix a few more memory leaks.
- Code cleanups and typo fixes.
- Fix an unlocked inode fork pointer access in getbmap.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>