x86/mm: implement free pmd/pte page interfaces
authorToshi Kani <toshi.kani@hpe.com>
Thu, 22 Mar 2018 23:17:24 +0000 (16:17 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 28 Mar 2018 16:24:38 +0000 (18:24 +0200)
commit5bbd932ff58f518ab2de7893940ca98f4f6c43e8
treed1e687404138e82da6e167f545f8e35aebbd8647
parentacdb4981644c8e31ccee294bdefff475c0cf587b
x86/mm: implement free pmd/pte page interfaces

commit 28ee90fe6048fa7b7ceaeb8831c0e4e454a4cf89 upstream.

Implement pud_free_pmd_page() and pmd_free_pte_page() on x86, which
clear a given pud/pmd entry and free up lower level page table(s).

The address range associated with the pud/pmd entry must have been
purged by INVLPG.

Link: http://lkml.kernel.org/r/20180314180155.19492-3-toshi.kani@hpe.com
Fixes: e61ce6ade404e ("mm: change ioremap to set up huge I/O mappings")
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Reported-by: Lei Li <lious.lilei@hisilicon.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/mm/pgtable.c