Pull performance events updates from Ingo Molnar:
 "Core updates:

   - Try to allocate task_ctx_data quickly, to optimize O(N^2) algorithm
     on large systems with O(100k) threads (Namhyung Kim)

  AMD PMU driver IBS support updates and fixes, by Ravi Bangoria:
   - Fix interrupt accounting for discarded samples
   - Fix a Zen5-specific quirk
   - Fix PhyAddrVal handling
   - Fix NMI-safety with perf_allow_kernel()
   - Fix a race between event add and NMIs

  Intel PMU driver updates:
   - Only check GP counters for PEBS constraints validation (Dapeng Mi)

  MSR driver:
   - Turn SMI_COUNT and PPERF on by default, instead of a long list of
     CPU models to enable them on (Kan Liang)

  ... and misc cleanups and fixes by Aldf Conte, Anshuman Khandual,
  Namhyung Kim, Ravi Bangoria and Yen-Hsiang Hsu"

* tag 'perf-core-2026-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/events: Replace READ_ONCE() with standard pgtable accessors
  perf/x86/msr: Make SMI and PPERF on by default
  perf/x86/intel/p4: Fix unused variable warning in p4_pmu_init()
  perf/x86/intel: Only check GP counters for PEBS constraints validation
  perf/x86/amd/ibs: Fix comment typo in ibs_op_data
  perf/amd/ibs: Advertise remote socket capability
  perf/amd/ibs: Enable streaming store filter
  perf/amd/ibs: Enable RIP bit63 hardware filtering
  perf/amd/ibs: Enable fetch latency filtering
  perf/amd/ibs: Support IBS_{FETCH|OP}_CTL2[Dis] to eliminate RMW race
  perf/amd/ibs: Add new MSRs and CPUID bits definitions
  perf/amd/ibs: Define macro for ldlat mask and shift
  perf/amd/ibs: Avoid race between event add and NMI
  perf/amd/ibs: Avoid calling perf_allow_kernel() from the IBS NMI handler
  perf/amd/ibs: Preserve PhyAddrVal bit when clearing PhyAddr MSR
  perf/amd/ibs: Limit ldlat->l3missonly dependency to Zen5
  perf/amd/ibs: Account interrupt for discarded samples
  perf/core: Simplify __detach_global_ctx_data()
  perf/core: Try to allocate task_ctx_data quickly
  perf/core: Pass GFP flags to attach_task_ctx_data()

The comment for tag_to_ret_ctr in ibs_op_data says "15-31"
but it should be "16-31".

Fix the misleading comment. No functional changes.

Signed-off-by: Yen-Hsiang Hsu <rrrrr4413@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260113141830.3204114-1-rrrrr4413@gmail.com

To get the comment changes in this commit:

  171efc70097a9f5f ("x86/ibs: Fix typo in dc_l2tlb_miss comment")

This silences this perf build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/arch/x86/include/asm/amd/ibs.h arch/x86/include/asm/amd/ibs.h

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

To pick up the changes from:

  861c6b1185fbb2e3 ("x86/platform/amd: Add standard header guards to <asm/amd/ibs.h>")

A small change to tools/perf/check-headers.sh was made to cope with the
move of this header done in:

  3846389c03a85188 ("x86/platform/amd: Move the <asm/amd-ibs.h> header to <asm/amd/ibs.h>")

That don't result in any changes in the tools, just address this perf
build warning:

Warning: Kernel ABI header differences:
  diff -u tools/arch/x86/include/asm/amd/ibs.h arch/x86/include/asm/amd/ibs.h

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/aEtCi0pup5FEwnzn@x1
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Synchronize with what we did with the kernel side header in:

  3846389c03a8 ("x86/platform/amd: Move the <asm/amd-ibs.h> header to <asm/amd/ibs.h>")

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org