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Date:   Tue, 1 Jun 2021 14:54:15 +0100
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Mike Rapoport <rppt@kernel.org>
Cc:     linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        David Hildenbrand <david@redhat.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Will Deacon <will@kernel.org>,
        linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
        linux-mm@kvack.org, linux-s390@vger.kernel.org
Subject: Re: [RFC/RFT PATCH 2/5] memblock: introduce generic
 memblock_setup_resources()
Message-ID: <20210601135415.GZ30436@shell.armlinux.org.uk>
References: <20210531122959.23499-1-rppt@kernel.org>
 <20210531122959.23499-3-rppt@kernel.org>
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Sender: Russell King (Oracle) <linux@armlinux.org.uk>
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On Mon, May 31, 2021 at 03:29:56PM +0300, Mike Rapoport wrote:
> +	code_resource.start = __pa_symbol(_text);
> +	code_resource.end = __pa_symbol(_etext)-1;
> +	rodata_resource.start = __pa_symbol(__start_rodata);
> +	rodata_resource.end = __pa_symbol(__end_rodata)-1;
> +	data_resource.start = __pa_symbol(_sdata);
> +	data_resource.end = __pa_symbol(_edata)-1;
> +	bss_resource.start = __pa_symbol(__bss_start);
> +	bss_resource.end = __pa_symbol(__bss_stop)-1;

This falls short on 32-bit ARM. The old code was:

-       kernel_code.start   = virt_to_phys(_text);
-       kernel_code.end     = virt_to_phys(__init_begin - 1);
-       kernel_data.start   = virt_to_phys(_sdata);                             
-       kernel_data.end     = virt_to_phys(_end - 1);                           

If I look at one of my kernels:

c0008000 T _text
c0b5b000 R __end_rodata
... exception and unwind tables live here ...
c0c00000 T __init_begin
c0e00000 D _sdata
c0e68870 D _edata
c0e68870 B __bss_start
c0e995d4 B __bss_stop
c0e995d4 B _end

So the original covers _text..__init_begin-1 which includes the
exception and unwind tables. Your version above omits these, which
leaves them exposed.

-- 
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