Messages in this thread | | | Subject | Re: [PATCH] arm64: apply ARM64_ERRATUM_845719 workaround for Brahma-B53 core | From | Florian Fainelli <> | Date | Thu, 31 Oct 2019 10:18:42 -0700 |
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On 10/31/19 6:21 AM, Will Deacon wrote: > On Tue, Oct 29, 2019 at 12:16:19PM -0700, Florian Fainelli wrote: >> From: Doug Berger <opendmb@gmail.com> >> >> The Broadcom Brahma-B53 core is susceptible to the issue described by >> ARM64_ERRATUM_845719 so this commit enables the workaround to be applied >> when executing on that core. >> >> Since there are now multiple entries to match, we must convert the >> existing ARM64_ERRATUM_845719 into an erratum list. > > Looks fine to me, but I have to ask: are you sure you don't want to select > any of ARM64_ERRATUM_{826319, 827319, 824069, 819472, 843419} ?
Out of this list, we are only subject to 843419 (and 845719) since I am told that only r0p4 (inclusive) and beyond are relevant.
Good thing that you mentioned 843419 because in our downstream kernel (4.9) this is a "static" workaround in that once enabled, it just is unconditionally active, whereas in later kernels there is some additional run time determination of whether this is really needed, thanks!
> > Also, please can you update Documentation/arm64/silicon-errata.rst ?
Absolutely. -- Florian
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