linux-kernel - Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable pagefault/preempt twice

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Message-ID: <20200521172704.GF23230@ZenIV.linux.org.uk>
Date:   Thu, 21 May 2020 18:27:04 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     ira.weiny@...el.com, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dri-devel@...ts.freedesktop.org,
        Christian Koenig <christian.koenig@....com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable
 pagefault/preempt twice

On Tue, May 19, 2020 at 09:54:22AM -0700, Guenter Roeck wrote:
> On Mon, May 18, 2020 at 11:48:43AM -0700, ira.weiny@...el.com wrote:
> > From: Ira Weiny <ira.weiny@...el.com>
> > 
> > The kunmap_atomic clean up failed to remove one set of pagefault/preempt
> > enables when vaddr is not in the fixmap.
> > 
> > Fixes: bee2128a09e6 ("arch/kunmap_atomic: consolidate duplicate code")
> > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 
> microblazeel works with this patch, as do the nosmp sparc32 boot tests,
> but sparc32 boot tests with SMP enabled still fail with lots of messages
> such as:

BTW, what's your setup for sparc32 boot tests?  IOW, how do you manage to
shrink the damn thing enough to have the loader cope with it?  I hadn't
been able to do that for the current mainline ;-/