netdev - Re: [PATCH v2] vmalloc: Fix issues with flush flag

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Date:   Mon, 20 May 2019 15:48:55 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     rick.p.edgecombe@...el.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        peterz@...radead.org, mroos@...ux.ee, netdev@...r.kernel.org,
        sparclinux@...r.kernel.org, bp@...en8.de, luto@...nel.org,
        mingo@...hat.com, namit@...are.com, dave.hansen@...el.com
Subject: Re: [PATCH v2] vmalloc: Fix issues with flush flag

From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
Date: Mon, 20 May 2019 22:17:49 +0000

> Thanks for testing. So I guess that suggests it's the TLB flush causing
> the problem on sparc and not any lazy purge deadlock. I had sent Meelis
> another test patch that just flushed the entire 0 to ULONG_MAX range to
> try to always the get the "flush all" logic and apprently it didn't
> boot mostly either. It also showed that it's not getting stuck anywhere
> in the vm_remove_alias() function. Something just hangs later.

I wonder if an address is making it to the TLB flush routines which is
not page aligned.  Or a TLB flush is being done before the callsites
are patched properly for the given cpu type.