From: Ingo Molnar <mingo@kernel.org>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Dave Young <dyoung@redhat.com>, Baoquan He <bhe@redhat.com>,
Vivek Goyal <vgoyal@redhat.com>,
kexec@lists.infradead.org, stable@vger.kernel.org
Subject: Re: [PATCH] kdump: Write a correct address of mem_section into vmcoreinfo
Date: Sat, 13 Jan 2018 11:48:38 +0100 [thread overview]
Message-ID: <20180113104838.ht57uooqk3fo546o@gmail.com> (raw)
In-Reply-To: <20180112162532.35896-1-kirill.shutemov@linux.intel.com>
* Kirill A. Shutemov <kirill.shutemov@linux.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@linux.intel.com>
> Fixes: 83e3c48729d9 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y")
> Cc: stable@vger.kernel.org
> Acked-by: Baoquan He <bhe@redhat.com>
> Acked-by: Dave Young <dyoung@redhat.com>
You forgot the Reported-by - I added that to the commit.
Thanks,
Ingo
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next prev parent reply other threads:[~2018-01-13 10:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-12 16:25 [PATCH] kdump: Write a correct address of mem_section into vmcoreinfo Kirill A. Shutemov
2018-01-13 10:48 ` Ingo Molnar [this message]
2018-01-13 18:26 ` Kirill A. Shutemov
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