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Leo Yan 5cbf75e0f0 perf: arm_spe: Properly set hw.state on failures 
[ Upstream commit 283182c1c2 ]

When arm_spe_pmu_next_off() fails to calculate a valid limit, it returns
zero to indicate that tracing should not start.  However, the caller
arm_spe_perf_aux_output_begin() does not propagate this failure by
updating hwc->state, cause the error to be silently ignored by upper
layers.

Because hwc->state remains zero after a failure, arm_spe_pmu_start()
continues to programs filter registers unnecessarily.  The driver
still reports success to the perf core, so the core assumes the SPE
event was enabled and proceeds to enable other events.  This breaks
event group semantics: SPE is already stopped while other events in the
same group are enabled.

Fix this by updating arm_spe_perf_aux_output_begin() to return a status
code indicating success (0) or failure (-EIO).  Both the interrupt
handler and arm_spe_pmu_start() check the return value and call
arm_spe_pmu_stop() to set PERF_HES_STOPPED in hwc->state.

In the interrupt handler, the period (e.g., period_left) needs to be
updated, so PERF_EF_UPDATE is passed to arm_spe_pmu_stop().  When the
error occurs during event start, the trace unit is not yet enabled, so
a flag '0' is used to drain buffer and update state only.

Fixes: d5d9696b03 ("drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension")
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-02-26 14:59:01 -08:00
arch arm64/gcs: Fix error handling in arch_set_shadow_stack_status() 2026-02-26 14:59:01 -08:00
block block,bfq: fix aux stat accumulation destination 2026-02-11 13:41:47 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:32:12 +01:00
Documentation fou: Don't allow 0 for FOU_ATTR_IPPROTO. 2026-01-30 10:32:12 +01:00
drivers
fs iomap: fix submission side handling of completion side errors 2026-02-26 14:59:00 -08:00
include Partial revert "x86/xen: fix balloon target initialization for PVH dom0" 2026-02-26 14:59:01 -08:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/sync: validate passed in offset 2026-02-26 14:59:00 -08:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel rcu: Fix rcu_read_unlock() deadloop due to softirq 2026-02-26 14:58:57 -08:00
lib procfs: avoid fetching build ID while holding VMA lock 2026-02-11 13:41:41 +01:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/hugetlb: fix excessive IPI broadcasts when unsharing PMD tables using mmu_gather 2026-02-19 16:31:34 +01:00
net ipv6: Fix ECMP sibling count mismatch when clearing RTF_ADDRCONF 2026-02-11 13:41:59 +01:00
rust rust: driver: fix broken intra-doc links to example driver types 2026-02-19 16:31:31 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts scripts: generate_rust_analyzer: Add compiler_builtins -> core dep 2026-02-06 16:57:42 +01:00
security keys/trusted_keys: fix handle passed to tpm_buf_append_name during unseal 2026-01-30 10:32:22 +01:00
sound ASoC: fsl_xcvr: fix missing lock in fsl_xcvr_mode_put() 2026-02-19 16:31:34 +01:00
tools selftests/resctrl: Fix a division by zero error on Hygon 2026-02-26 14:58:57 -08:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Don't clobber irqfd routing type when deassigning irqfd 2026-02-11 13:41:44 +01:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.13 2026-02-19 16:31:37 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.