* ARMv8 fp register corruption in 4.14 PREEMPT_RT series
@ 2019-03-27 21:35 Allen Martin
2019-03-28 14:18 ` Tom Zanussi
0 siblings, 1 reply; 2+ messages in thread
From: Allen Martin @ 2019-03-27 21:35 UTC (permalink / raw)
To: zanussi; +Cc: linux-rt-users, anup.pemmaiah, bigeasy
Hi Tom, I can confirm the ARMv8 fp register corruption reported here:
https://marc.info/?l=linux-rt-users&m=153930857708206&w=2
still exists in 4.14.106-rt56. I was able to reproduce this on both
A57 and Carmel ARMv8 CPUs using the float_bessel subtest of LTP. This
fix was to backport the following patch from 4.18.y-rt to 4.14-rt:
3afdfe419c33c1655d0763e070350aad44416594
arm64: fpsimd: use preemp_disable in addition to local_bh_disable()
Are you able to pick up this patch into 4.14-rt? I'm sure Anup and I
are not the only ones who are hitting this.
-Allen
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: ARMv8 fp register corruption in 4.14 PREEMPT_RT series
2019-03-27 21:35 ARMv8 fp register corruption in 4.14 PREEMPT_RT series Allen Martin
@ 2019-03-28 14:18 ` Tom Zanussi
0 siblings, 0 replies; 2+ messages in thread
From: Tom Zanussi @ 2019-03-28 14:18 UTC (permalink / raw)
To: Allen Martin; +Cc: linux-rt-users, anup.pemmaiah, bigeasy
Hi Allen,
On Wed, 2019-03-27 at 14:35 -0700, Allen Martin wrote:
> Hi Tom, I can confirm the ARMv8 fp register corruption reported here:
>
> https://marc.info/?l=linux-rt-users&m=153930857708206&w=2
>
> still exists in 4.14.106-rt56. I was able to reproduce this on both
> A57 and Carmel ARMv8 CPUs using the float_bessel subtest of
> LTP. This
> fix was to backport the following patch from 4.18.y-rt to 4.14-rt:
>
> 3afdfe419c33c1655d0763e070350aad44416594
> arm64: fpsimd: use preemp_disable in addition to local_bh_disable()
>
> Are you able to pick up this patch into 4.14-rt? I'm sure Anup and I
> are not the only ones who are hitting this.
>
Yes, I was just about to start a new 4.14 update and will pull this one
in. Thanks for letting me know.
Tom
> -Allen
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-03-27 21:35 ARMv8 fp register corruption in 4.14 PREEMPT_RT series Allen Martin
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