Mark Rutland 78b23877db kselftest/arm64: fp-ptrace: Fix expected FPMR value when PSTATE.SM is changed ... The fp-ptrace test suite expects that FPMR is set to zero when PSTATE.SM is changed via ptrace, but ptrace has never altered FPMR in this way, and the test logic erroneously relies upon (and has concealed) a bug where task_fpsimd_load() would unexpectedly and non-deterministically clobber FPMR. Using ptrace, FPMR can only be altered by writing to the NT_ARM_FPMR regset. The value of PSTATE.SM can be altered by writing to the NT_ARM_SVE or NT_ARM_SSVE regsets, and/or by changing the SME vector length (when writing to the NT_ARM_SVE, NT_ARM_SSVE, or NT_ARM_ZA regsets), but none of these writes will change the value of FPMR. The task_fpsimd_load() bug was introduced with the initial FPMR support in commit: 203f2b95a8 ("arm64/fpsimd: Support FEAT_FPMR") The incorrect FPMR test code was introduced in commit: 7dbd26d0b2 ("kselftest/arm64: Add FPMR coverage to fp-ptrace") Subsequently, the task_fpsimd_load() bug was fixed in commit: e5fa85fce0 ("arm64/fpsimd: Don't corrupt FPMR when streaming mode changes") ... whereupon the fp-ptrace FPMR tests started failing reliably, e.g. | # # Mismatch in saved FPMR: 915058000 != 0 | # not ok 25 SVE write, SVE 64->64, SME 64/0->64/1 Fix this by changing the test to expect that FPMR is *NOT* changed when PSTATE.SM is changed via ptrace, matching the extant behaviour. I've chosen to update the test code rather than modifying ptrace to zero FPMR when PSTATE.SM changes. Not zeroing FPMR is simpler overall, and allows the NT_ARM_FPMR regset to be handled independently from other regsets, leaving less scope for error. Fixes: 7dbd26d0b2 ("kselftest/arm64: Add FPMR coverage to fp-ptrace") Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Spickett <david.spickett@arm.com> Cc: Luis Machado <luis.machado@arm.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Mark Brown <broonie@kernel.org> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20250508132644.1395904-22-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org>		2025-05-08 15:45:24 +01:00
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accounting
arch	perf tools changes for v6.15	2025-03-31 08:52:33 -07:00
bootconfig
bpf	bpf-next-6.15	2025-03-30 12:43:03 -07:00
build	perf tools changes for v6.15	2025-03-31 08:52:33 -07:00
certs
cgroup
counter
crypto
debugging	taint: Add TAINT_FWCTL	2025-03-06 15:13:13 -04:00
firewire
firmware
gpio
hv
iio
include	tools/include: make uapi/linux/types.h usable from assembly	2025-04-06 12:55:31 -07:00
kvm/kvm_stat
laptop
leds
lib	- The 7 patch series "powerpc/crash: use generic crashkernel	2025-04-01 10:06:52 -07:00
memory-model	tools/memory-model: glossary.txt: Fix indents	2025-02-25 10:22:34 -08:00
mm
net
objtool	These are objtool fixes and updates by Josh Poimboeuf, centered	2025-04-02 10:30:10 -07:00
pcmcia
perf	tracing/timers: Rename the hrtimer_init event to hrtimer_setup	2025-04-05 10:30:17 +02:00
power	Turbostat 2025.05.06	2025-04-06 12:32:43 -07:00
rcu
sched_ext	tools/sched_ext: Sync with scx repo	2025-04-02 09:08:33 -10:00
scripts	tracing tooling updates for 6.15:	2025-03-27 17:03:01 -07:00
sound	ASoC: dapm-graph: set fill colour of turned on nodes	2025-02-24 18:35:54 +00:00
spi
testing	kselftest/arm64: fp-ptrace: Fix expected FPMR value when PSTATE.SM is changed	2025-05-08 15:45:24 +01:00
thermal	tools: Remove redundant quiet setup	2025-02-18 16:27:43 -03:00
time
tracing	tracing tooling updates for 6.15:	2025-03-27 17:03:01 -07:00
usb
verification	tracing tooling updates for 6.15:	2025-03-27 17:03:01 -07:00
virtio	tools: virtio/linux/module.h add MODULE_DESCRIPTION() define.	2025-02-25 07:10:45 -05:00
wmi
workqueue
writeback
Makefile	tools/Makefile: Remove pci target	2025-03-08 14:35:32 +00:00