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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2017-03-17 19:55:13 +0100
committerIngo Molnar <mingo@kernel.org>2017-03-27 08:56:41 +0200
commitd691a3cf8004784303f0a4c1c036edfaa7d64d0b (patch)
treea8f55335805ba7b7c2f831249786ae02463c4dfd
parentx86/mm/pat: Add 5-level paging support (diff)
downloadlinux-d691a3cf8004784303f0a4c1c036edfaa7d64d0b.tar.xz
linux-d691a3cf8004784303f0a4c1c036edfaa7d64d0b.zip
x86/kasan: Prepare clear_pgds() to switch to <asm-generic/pgtable-nop4d.h>
With folded p4d, pgd_clear() is a nop. Change clear_pgds() to use p4d_clear() instead. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-arch@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20170317185515.8636-5-kirill.shutemov@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/x86/mm/kasan_init_64.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 8d63d7a104c3..7b81f01067f2 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -32,8 +32,19 @@ 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);
+ /*
+ * With folded p4d, pgd_clear() is nop, use p4d_clear()
+ * instead.
+ */
+ 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)