linux-kernel - Re: [PATCH] kdump: Write a correct address of mem

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Message-ID: <20180113104838.ht57uooqk3fo546o@gmail.com>
Date:   Sat, 13 Jan 2018 11:48:38 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>, kexec@...ts.infradead.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] kdump: Write a correct address of mem_section into
 vmcoreinfo


* Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> wrote:

> Depending on configuration mem_section can now be an array or a pointer
> to an array allocated dynamically. In most cases, we can continue to refer
> to it as 'mem_section' regardless of what it is.
> 
> But there's one exception: '&mem_section' means "address of the array" if
> mem_section is an array, but if mem_section is a pointer, it would mean
> "address of the pointer".
> 
> We've stepped onto this in kdump code. VMCOREINFO_SYMBOL(mem_section)
> writes down address of pointer into vmcoreinfo, not array as we wanted.
> 
> Let's introduce VMCOREINFO_SYMBOL_ARRAY() that would handle the
> situation correctly for both cases.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Fixes: 83e3c48729d9 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y")
> Cc: stable@...r.kernel.org
> Acked-by: Baoquan He <bhe@...hat.com>
> Acked-by: Dave Young <dyoung@...hat.com>

You forgot the Reported-by - I added that to the commit.

Thanks,

	Ingo