]> git.baikalelectronics.ru Git - kernel.git/commit
x86/mm/hotplug: Don't remove PGD entries in remove_pagetable()
authorIngo Molnar <mingo@kernel.org>
Thu, 14 Jul 2016 20:22:49 +0000 (13:22 -0700)
committerIngo Molnar <mingo@kernel.org>
Fri, 15 Jul 2016 08:26:24 +0000 (10:26 +0200)
commit8a2ac1cded3701647ec3b84f0a11ff400877b285
treee136e97c57bffa4497c21660a023d6e00438202f
parent0b109e48ebf11a559637dec1e310250abfd83e3e
x86/mm/hotplug: Don't remove PGD entries in remove_pagetable()

So when memory hotplug removes a piece of physical memory from pagetable
mappings, it also frees the underlying PGD entry.

This complicates PGD management, so don't do this. We can keep the
PGD mapped and the PUD table all clear - it's only a single 4K page
per 512 GB of memory hotplugged.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <Waiman.Long@hp.com>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/064ff6c7275734537f969e876f6cd0baa954d2cc.1468527351.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/mm/init_64.c