Re: v6.12-rt arm updates

On 7/17/26 3:46 PM, [email protected] wrote:
> not sure how to read this below, I try my best.

Yeah, sorry, it's a bit random notes.

>> # v6.12-stable material relevant for RT but no patches to drop from
>> # rt queue:
>> # 47c5d569d39d ("ARM: group is_permission_fault() with
>> is_translation_fault()")
>> # d5e8be7bea8d ("ARM: allow __do_kernel_fault() to report execution of
>> memory faults")
>> # 25ae6a5c473b ("ARM: fix hash_name() fault")
>> # fed889edca79 ("ARM: fix branch predictor hardening")
>=20
> Those few should have entered via -stable.

Right, nothing to do here. I just mentioned them here, because they were=20
mentioned as dependency in in Jan's backport RFC series.

>> # landed in v6.12-stable, thus drop those
>> # (commit ids from v6.12-stable):
>> # 0001-arm-Disable-jump-label-on-PREEMPT_RT.patch
>> # 256d97d3587b ("ARM: 9459/1: Disable jump-label on PREEMPT_RT")
>>
>> # arm-Disable-FAST_GUP-on-PREEMPT_RT-if-HIGHPTE-is-als.patch
>> # 1b645cd729ef ("ARM: 9461/1: Disable HIGHPTE on PREEMPT_RT kernels")

I've dropped those.

>> # Commits in upstream but not in v6.12-stable
>> ARM__enable_irq_in_translation_section_permission_fault_handlers.patch
>> #  59e4f3b45b96 ("ARM: ensure interrupts are enabled in __do_user_fault(=
)")

I've replaced the downstream patch with the commit mentioned...
> You should be able to drop a few of those and replace them with what I
> have in v6.18
> =09https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/=
commit/?h=3Dlinux-6.18.y-rt-patches&id=3D73c8e8d7a75fcc8b9026385e64990f3d5e=
c8a40d=09

... which is what you have done here as well. The main difference is=20
that v6.12-stable ships 'ARM: 9459/1: Disable jump-label on PREEMPT_RT'

The resulting v6.12-rt queue is

0001-ARM-ensure-interrupts-are-enabled-in-__do_user_fault.patch
0001-ARM-vfp-Provide-vfp_state_hold-for-VFP-locking.patch
0002-ARM-vfp-Use-vfp_state_hold-in-vfp_sync_hwstate.patch
0003-ARM-vfp-Use-vfp_state_hold-in-vfp_support_entry.patch
0004-ARM-vfp-Move-sending-signals-outside-of-vfp_state_ho.patch
ARM__Allow_to_enable_RT.patch