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Date: Sun, 31 May 2015 22:05:02 -0400
Message-ID: <CAD6TEOBtaWsYAx8YYUdTzgm8vRUzjiSKz3BVf4vnUk_Wn6tVwQ@mail.gmail.com>
Subject: Is free_all_bootmem broken for ARM in Linux 4.0
From: Andy Joe <jyizheng@gmail.com>
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Hi Experts,

I found that there some modifications to the initialization of memory
system for ARM. In particular, init_bootmem_node is no longer called.
But free_all_bootmem is still in use. In this sense, the global variable
bdata_list is empty. I wonder how the new code is able to free pages
to buddy system. Is this an issue?

The related code are listed below.

http://lxr.free-electrons.com/source/arch/arm/mm/init.c#L530
http://lxr.free-electrons.com/source/mm/bootmem.c#L272

Please help.
Thanks,

Yizheng

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<div dir=3D"ltr">Hi Experts,<div><br></div><div>I found that there some mod=
ifications to the initialization of memory</div><div>system for ARM. In par=
ticular, init_bootmem_node is no longer called.</div><div>But free_all_boot=
mem is still in use. In this sense, the global variable=C2=A0</div><div>bda=
ta_list is empty. I wonder how the new code is able to free pages=C2=A0</di=
v><div>to buddy system. Is this an issue?</div><div><br></div><div>The rela=
ted code are listed below.</div><div><br></div><div><a href=3D"http://lxr.f=
ree-electrons.com/source/arch/arm/mm/init.c#L530">http://lxr.free-electrons=
.com/source/arch/arm/mm/init.c#L530</a>=C2=A0</div><div><a href=3D"http://l=
xr.free-electrons.com/source/mm/bootmem.c#L272">http://lxr.free-electrons.c=
om/source/mm/bootmem.c#L272</a><br></div><div><br></div><div>Please help.=
=C2=A0</div><div>Thanks,</div><div><br></div><div>Yizheng</div></div>

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