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Message-Id: <20170313055020.69655-11-kirill.shutemov@linux.intel.com>
Date: Mon, 13 Mar 2017 08:50:04 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
"H. Peter Anvin" <hpa@...or.com>
Cc: Andi Kleen <ak@...ux.intel.com>,
Dave Hansen <dave.hansen@...el.com>,
Andy Lutomirski <luto@...capital.net>,
Michal Hocko <mhocko@...e.com>, linux-arch@...r.kernel.org,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Dmitry Vyukov <dvyukov@...gle.com>
Subject: [PATCH 10/26] x86/kasan: prepare clear_pgds() to switch to <asm-generic/pgtable-nop4d.h>
With folded p4d, pgd_clear() is nop. Change clear_pgds() to use
p4d_clear() instead.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
---
arch/x86/mm/kasan_init_64.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 8d63d7a104c3..733f8ba6a01f 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -32,8 +32,15 @@ static int __init map_range(struct range *range)
static void __init clear_pgds(unsigned long start,
unsigned long end)
{
- for (; start < end; start += PGDIR_SIZE)
- pgd_clear(pgd_offset_k(start));
+ pgd_t *pgd;
+
+ for (; start < end; start += PGDIR_SIZE) {
+ pgd = pgd_offset_k(start);
+ if (CONFIG_PGTABLE_LEVELS < 5)
+ p4d_clear(p4d_offset(pgd, start));
+ else
+ pgd_clear(pgd);
+ }
}
static void __init kasan_map_early_shadow(pgd_t *pgd)
--
2.11.0
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