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Patch series "init_mm: cleanup ARCH's text/data/brk setup code", v3.

Add setup_initial_init_mm() helper, then use it to cleanup the text, data
and brk setup code.

This patch (of 15):

Add setup_initial_init_mm() helper to setup kernel text, data and brk.

Link: https://lkml.kernel.org/r/20210608083418.137226-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20210608083418.137226-2-wangkefeng.wang@huawei.com

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonas Bonn <jonas@sout...