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Message-Id: <20200615092229.23142-1-rppt@kernel.org>
Date: Mon, 15 Jun 2020 12:22:29 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
Michael Ellerman <mpe@...erman.id.au>
Cc: Christophe Leroy <christophe.leroy@....fr>,
linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...nel.org>,
Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH] powerpc/8xx: use pmd_off() to access a PMD entry in pte_update()
From: Mike Rapoport <rppt@...ux.ibm.com>
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@...ux.ibm.com>
---
I think it's powerpc material, but I won't mind if Andrew picks it up :)
arch/powerpc/include/asm/nohash/32/pgtable.h | 8 +++-----
1 file 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;
--
2.26.2
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