Hi Greg,
[+Suzuki]
On Mon, Nov 04, 2019 at 10:21:07AM +0100, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
> The patch below does not apply to the 4.19-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@xxxxxxxxxxxxxxx>.
>
> thanks,
>
> greg k-h
>
> ------------------ original commit in Linus's tree ------------------
>
> From d4af3c4b81f4cd5662baa6f1492f998d89783318 Mon Sep 17 00:00:00 2001
> From: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> Date: Tue, 29 Oct 2019 10:15:39 -0700
> Subject: [PATCH] arm64: cpufeature: Enable Qualcomm Falkor/Kryo errata 1003
>
> With the introduction of 'cce360b54ce6 ("arm64: capabilities: Filter the
> entries based on a given mask")' the Qualcomm Falkor/Kryo errata 1003 is
> no long applied.
>
> The result of not applying errata 1003 is that MSM8996 runs into various
> RCU stalls and fails to boot most of the times.
>
> Give 1003 a "type" to ensure they are not filtered out in
> update_cpu_capabilities().
>
> Fixes: cce360b54ce6 ("arm64: capabilities: Filter the entries based on a given mask")
I think this Fixes tag is actually wrong, and so this patch isn't required
for the 4.19-stable tree or earlier.
The bug appears to have been introduced by a3dcea2c8512 ("arm64: capabilities:
Merge duplicate entries for Qualcomm erratum 1003") in v5.0.
Thanks,
Will
> diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
> index 6c3b10a41bd8..7f9b699969c7 100644
> --- a/arch/arm64/kernel/cpu_errata.c
> +++ b/arch/arm64/kernel/cpu_errata.c
> @@ -816,6 +816,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
> {
> .desc = "Qualcomm Technologies Falkor/Kryo erratum 1003",
> .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
> + .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
> .matches = cpucap_multi_entry_cap_matches,
> .match_list = qcom_erratum_1003_list,
> },
>
