From: Mike Rapoport <rppt@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Brian Cain <bcain@codeaurora.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Fenghua Yu <fenghua.yu@intel.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Guan Xuetao <gxt@pku.edu.cn>, James Morse <james.morse@arm.com>,
Jonas Bonn <jonas@southpole.se>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Ley Foon Tan <ley.foon.tan@intel.com>,
Marc Zyngier <maz@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>, Rich Felker <dalias@libc.org>,
Russell King <linux@armlinux.org.uk>,
Stafford Horne <shorne@gmail.com>,
Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Tony Luck <tony.luck@intel.com>, Will Deacon <will@kernel.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
kvmarm@lists.cs.columbia.edu, kvm-ppc@vger.kernel.org,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-sh@vger.kernel.org, nios2-dev@lists.rocketboards.org,
openrisc@lists.librecores.org,
uclinux-h8-devel@lists.sourceforge.jp,
Mike Rapoport <rppt@kernel.org>,
Mike Rapoport <rppt@linux.ibm.com>
Subject: [PATCH v3 07/14] powerpc/32: drop get_pteptr()
Date: Thu, 27 Feb 2020 10:46:01 +0200 [thread overview]
Message-ID: <20200227084608.18223-8-rppt@kernel.org> (raw)
In-Reply-To: <20200227084608.18223-1-rppt@kernel.org>
From: Christophe Leroy <christophe.leroy@c-s.fr>
Commit 8d30c14cab30 ("powerpc/mm: Rework I$/D$ coherency (v3)") and
commit 90ac19a8b21b ("[POWERPC] Abolish iopa(), mm_ptov(),
io_block_mapping() from arch/powerpc") removed the use of get_pteptr()
outside of mm/pgtable_32.c
In mm/pgtable_32.c, the only user of get_pteptr() is __change_page_attr()
which operates on kernel context and on lowmem pages only.
Move page table traversal to __change_page_attr() and drop get_pteptr().
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
arch/powerpc/mm/pgtable_32.c | 43 ++++++------------------------------
1 file changed, 7 insertions(+), 36 deletions(-)
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 5fb90edd865e..4894555622d7 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -121,53 +121,24 @@ void __init mapin_ram(void)
}
}
-/* Scan the real Linux page tables and return a PTE pointer for
- * a virtual address in a context.
- * Returns true (1) if PTE was found, zero otherwise. The pointer to
- * the PTE pointer is unmodified if PTE is not found.
- */
-static int
-get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)
-{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- int retval = 0;
-
- pgd = pgd_offset(mm, addr & PAGE_MASK);
- if (pgd) {
- pud = pud_offset(pgd, addr & PAGE_MASK);
- if (pud && pud_present(*pud)) {
- pmd = pmd_offset(pud, addr & PAGE_MASK);
- if (pmd_present(*pmd)) {
- pte = pte_offset_map(pmd, addr & PAGE_MASK);
- if (pte) {
- retval = 1;
- *ptep = pte;
- if (pmdp)
- *pmdp = pmd;
- /* XXX caller needs to do pte_unmap, yuck */
- }
- }
- }
- }
- return(retval);
-}
-
static int __change_page_attr_noflush(struct page *page, pgprot_t prot)
{
pte_t *kpte;
pmd_t *kpmd;
- unsigned long address;
+ unsigned long address, va;
BUG_ON(PageHighMem(page));
address = (unsigned long)page_address(page);
+ va = address & PAGE_MASK;
if (v_block_mapped(address))
return 0;
- if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
+
+ kpmd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
+ if (!pmd_present(*kpmd))
return -EINVAL;
+
+ kpte = pte_offset_map(kpmd, va);
__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
pte_unmap(kpte);
--
2.24.0
next prev parent reply other threads:[~2020-02-27 8:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-27 8:45 [PATCH v3 00/14] mm: remove __ARCH_HAS_5LEVEL_HACK Mike Rapoport
2020-02-27 8:45 ` [PATCH v3 01/14] arm/arm64: add support for folded p4d page tables Mike Rapoport
2020-02-27 8:45 ` [PATCH v3 02/14] h8300: remove usage of __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-02-27 8:45 ` [PATCH v3 03/14] hexagon: remove __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-02-27 8:45 ` [PATCH v3 04/14] ia64: add support for folded p4d page tables Mike Rapoport
2020-02-27 8:45 ` [PATCH v3 05/14] nios2: " Mike Rapoport
2020-02-27 8:46 ` [PATCH v3 06/14] openrisc: " Mike Rapoport
2020-02-27 8:46 ` Mike Rapoport [this message]
2020-03-07 4:00 ` [PATCH v3 07/14] powerpc/32: drop get_pteptr() Andrew Morton
2020-03-08 10:54 ` Mike Rapoport
2020-02-27 8:46 ` [PATCH v3 08/14] powerpc: add support for folded p4d page tables Mike Rapoport
2020-02-27 8:46 ` [PATCH v3 09/14] sh: fault: Modernize printing of kernel messages Mike Rapoport
2020-02-27 8:46 ` [PATCH v3 10/14] sh: drop __pXd_offset() macros that duplicate pXd_index() ones Mike Rapoport
2020-02-27 8:46 ` [PATCH v3 11/14] sh: add support for folded p4d page tables Mike Rapoport
2020-02-27 8:46 ` [PATCH v3 12/14] unicore32: remove __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-02-27 8:46 ` [PATCH v3 13/14] asm-generic: remove pgtable-nop4d-hack.h Mike Rapoport
2020-02-27 8:46 ` [PATCH v3 14/14] mm: remove __ARCH_HAS_5LEVEL_HACK and include/asm-generic/5level-fixup.h Mike Rapoport
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