commit e0c4f6750e130541cca7390739d25feb522acfff
author Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Mon Mar 13 17:33:05 2017 +0300
committer Ingo Molnar <mingo@kernel.org> Tue Mar 14 08:45:08 2017 +0100
tree cec236ced5062579d3bed0b4314079626158f4a3
parent fe1e8c3e9634071ac608172e29bf997596d17c7c

x86/mm: Convert trivial cases of page table walk to 5-level paging

This patch only covers simple cases. Less trivial cases will be
converted with separate patches.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
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: 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: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20170313143309.16020-3-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/platform/efi/efi_64.c

diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index a4695da..8544dae 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -166,6 +166,7 @@
 {
 	unsigned num_entries;
 	pgd_t *pgd_k, *pgd_efi;
+	p4d_t *p4d_k, *p4d_efi;
 	pud_t *pud_k, *pud_efi;
 
 	if (efi_enabled(EFI_OLD_MEMMAP))
@@ -197,16 +198,20 @@
 	BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);
 
 	pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
-	pud_efi = pud_offset(pgd_efi, 0);
+	p4d_efi = p4d_offset(pgd_efi, 0);
+	pud_efi = pud_offset(p4d_efi, 0);
 
 	pgd_k = pgd_offset_k(EFI_VA_END);
-	pud_k = pud_offset(pgd_k, 0);
+	p4d_k = p4d_offset(pgd_k, 0);
+	pud_k = pud_offset(p4d_k, 0);
 
 	num_entries = pud_index(EFI_VA_END);
 	memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
 
-	pud_efi = pud_offset(pgd_efi, EFI_VA_START);
-	pud_k = pud_offset(pgd_k, EFI_VA_START);
+	p4d_efi = p4d_offset(pgd_efi, EFI_VA_START);
+	pud_efi = pud_offset(p4d_efi, EFI_VA_START);
+	p4d_k = p4d_offset(pgd_k, EFI_VA_START);
+	pud_k = pud_offset(p4d_k, EFI_VA_START);
 
 	num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
 	memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);