linux-kernel - Re: parisc crash on boot with 4.8+git

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Message-ID: <20161011184002.GA1363@p100.box>
Date:   Tue, 11 Oct 2016 20:40:02 +0200
From:   Helge Deller <deller@....de>
To:     Meelis Roos <mroos@...ux.ee>, linux-parisc@...r.kernel.org,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        John David Anglin <dave.anglin@...l.net>
Cc:     Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: parisc crash on boot with 4.8+git

* Meelis Roos <mroos@...ux.ee>:
> > > Memory Ranges:
> > >  0) Start 0x0000000000000000 End 0x000000003fffffff Size   1024 MB
> > >  1) Start 0x0000004040000000 End 0x000000407fdfffff Size   1022 MB
> > > Total Memory: 2046 MB

Meelis and myself debugged the crash off-list.
It turns out, that I missed to zero-initialize the new memblocks.
Patch below fixes this.

Helge

------------
parisc: Zero-initialize newly alloced memblock

Commit 4fe9e1d957e4 ("parisc: Drop bootmem and switch to memblock")
switched to the memblock allocator, but missed to zero-initialize the
newly allocated memblocks. This lead to crashes on some machines like
the rp3410.

Fixes: 4fe9e1d957e4 ("parisc: Drop bootmem and switch to memblock")
Signed-off-by: Helge Deller <deller@....de>

diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 356f384..62ac801 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -105,6 +105,8 @@ static void * __init get_memblock(unsigned long size)
 	else
 		panic("get_memblock() failed.\n");
 
+	memset(__va(phys), 0, size);
+
 	return __va(phys);
 }