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authorMike Rapoport <rppt@linux.ibm.com>2020-06-15 12:22:29 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2020-06-17 16:04:13 +0300
commit687993ccf3b05070598b89fad97410b26d7bc9d2 (patch)
treebfb4ccf212cb6ad4ff6a6e0ecff7b13942da9b49 /arch
parent0bdcfa182506526fbe4e088ff9ca86a31b81828d (diff)
downloadlinux-687993ccf3b05070598b89fad97410b26d7bc9d2.tar.xz
powerpc/8xx: use pmd_off() to access a PMD entry in pte_update()
The pte_update() implementation for PPC_8xx unfolds page table from the PGD level to access a PMD entry. Since 8xx has only 2-level page table this can be simplified with pmd_off() shortcut. Replace explicit unfolding with pmd_off() and drop defines of pgd_index() and pgd_offset() that are no longer needed. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200615092229.23142-1-rppt@kernel.org
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/nohash/32/pgtable.h8
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index b56f14160ae5..5a590ceaec14 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -205,10 +205,6 @@ static inline void pmd_clear(pmd_t *pmdp)
*pmdp = __pmd(0);
}
-/* to find an entry in a page-table-directory */
-#define pgd_index(address) ((address) >> PGDIR_SHIFT)
-#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
-
/*
* PTE updates. This function is called whenever an existing
* valid PTE is updated. This does -not- include set_pte_at()
@@ -230,6 +226,8 @@ static inline void pmd_clear(pmd_t *pmdp)
* For other page sizes, we have a single entry in the table.
*/
#ifdef CONFIG_PPC_8xx
+static pmd_t *pmd_off(struct mm_struct *mm, unsigned long addr);
+
static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
unsigned long clr, unsigned long set, int huge)
{
@@ -237,7 +235,7 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
pte_basic_t old = pte_val(*p);
pte_basic_t new = (old & ~(pte_basic_t)clr) | set;
int num, i;
- pmd_t *pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, addr), addr), addr), addr);
+ pmd_t *pmd = pmd_off(mm, addr);
if (!huge)
num = PAGE_SIZE / SZ_4K;