memory-hotplug: don't replace lowmem pages with highmem
memory-hotplug: don't replace lowmem pages with highmem

The changelog for commit 6a6dccba2fdc ("mm: cma: don't replace lowmem
pages with highmem") mentioned that lowmem pages can be replaced by
highmem pages during CMA migration.  6a6dccba2fdc fixed that issue.

Quote from that changelog:

:   The filesystem layer expects pages in the block device's mapping to not
:   be in highmem (the mapping's gfp mask is set in bdget()), but CMA can
:   currently replace lowmem pages with highmem pages, leading to crashes in
:   filesystem code such as the one below:
:
:     Unable to handle kernel NULL pointer dereference at virtual address 00000400
:     pgd = c0c98000
:     [00000400] *pgd=00c91831, *pte=00000000, *ppte=00000000
:     Internal error: Oops: 817 [#1] PREEMPT SMP ARM
:     CPU: 0    Not tainted  (3.5.0-rc5+ #80)
:     PC is at __memzero+0x24/0x80
:     ...
:     Process fsstress (pid: 323, stack limit = 0xc0cbc2f0)
:     Backtrace:
:     [<c010e3f0>] (ext4_getblk+0x0/0x180) from [<c010e58c>] (ext4_bread+0x1c/0x98)
:     [<c010e570>] (ext4_bread+0x0/0x98) from [<c0117944>] (ext4_mkdir+0x160/0x3bc)
:      r4:c15337f0
:     [<c01177e4>] (ext4_mkdir+0x0/0x3bc) from [<c00c29e0>] (vfs_mkdir+0x8c/0x98)
:     [<c00c2954>] (vfs_mkdir+0x0/0x98) from [<c00c2a60>] (sys_mkdirat+0x74/0xac)
:      r6:00000000 r5:c152eb40 r4:000001ff r3:c14b43f0
:     [<c00c29ec>] (sys_mkdirat+0x0/0xac) from [<c00c2ab8>] (sys_mkdir+0x20/0x24)
:      r6:beccdcf0 r5:00074000 r4:beccdbbc
:     [<c00c2a98>] (sys_mkdir+0x0/0x24) from [<c000e3c0>] (ret_fast_syscall+0x0/0x30)

Memory-hotplug has same problem as CMA has so the same fix can be applied
to memory-hotplug as well.

Fix it by reusing.

Signed-off-by: Minchan Kim <eee62f459f15dcddf87a8df69e8328e2a2562028@kernel.org>
Cc: Kamezawa Hiroyuki <634f508bd7c47cf0ee4126243675c3e598920fbc@jp.fujitsu.com>
Reviewed-by: Yasuaki Ishimatsu <9b26f769475fafc2d25107053b1bdd774d49438a@jp.fujitsu.com>
Acked-by: Michal Nazarewicz <605208d9b4c769ca62e9f9f8b592c9cd465fe6d7@mina86.com>
Cc: Marek Szyprowski <2a0259761cc3e88db42be5300c1579a67c77e65e@samsung.com>
Cc: Wen Congyang <59c7438a9275f5dd0b96a91958b493a9d005ad46@cn.fujitsu.com>
Acked-by: David Rientjes <d8cd2994e15bc61ddb2b113030bda55eebc3a0fe@google.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs