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UPSTREAM: arm64: consistently use p?d_set_huge

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Commit 324420bf91f60582 ("arm64: add support for ioremap() block
mappings") added new p?d_set_huge functions which do the hard work to
generate and set a correct block entry.

These differ from open-coded huge page creation in the early page table
code by explicitly setting the P?D_TYPE_SECT bits (which are implicitly
retained by mk_sect_prot() for any valid prot), but are otherwise
identical (and cannot fail on arm64).

For simplicity and consistency, make use of these in the initial page
table creation code.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Bug: 30369029
Patchset: kaslr-arm64-4.4

(cherry picked from commit c661cb1c537e2364bfdabb298fb934fd77445e98)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: I25e58a1626831c2c709abcded989d1770fea851c
This commit is contained in:
Mark Rutland 2016-03-22 10:11:45 +00:00 • committed by Jeff Vander Stoep
parent b6d54c720c
commit 25fd795692
1 changed files with 2 additions and 4 deletions
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6
arch/arm64/mm/mmu.c
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@ -211,8 +211,7 @@ static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
if (((addr | next | phys) & ~SECTION_MASK) == 0 &&
block_mappings_allowed(pgtable_alloc)) {
pmd_t old_pmd =*pmd;
set_pmd(pmd, __pmd(phys |
pgprot_val(mk_sect_prot(prot))));
pmd_set_huge(pmd, phys, prot);
/*
* Check for previous table entries created during
* boot (__create_page_tables) and flush them.
@ -272,8 +271,7 @@ static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
if (use_1G_block(addr, next, phys) &&
block_mappings_allowed(pgtable_alloc)) {
pud_t old_pud = *pud;
set_pud(pud, __pud(phys |
pgprot_val(mk_sect_prot(prot))));
pud_set_huge(pud, phys, prot);
/*
* If we have an old value for a pud, it will