From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Rapoport Subject: [PATCH v3 07/14] powerpc/32: drop get_pteptr() Date: Thu, 27 Feb 2020 10:46:01 +0200 Message-ID: <20200227084608.18223-8-rppt@kernel.org> References: <20200227084608.18223-1-rppt@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582793364; bh=d6JASArDTC2YfUmrU9XUpiTM3xImoHt6h/h+S4gwbKw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0x1SYOFRdLAqiutbk8dXzSYLqNK4ETW4iJYOWrtI8+trt2hNpAQQSkNNThvHytoHK sbrR13MAdpcaucxR0egMp+nacxwn7Jj7scMmKl0+W2M2EN14rTs9zMxDRW8QM5580x 98Tecr/imFBp2kLO33ktoryGWwg8fo5MsC/0AYHc= In-Reply-To: <20200227084608.18223-1-rppt@kernel.org> Sender: linux-arch-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Arnd Bergmann , Benjamin Herrenschmidt , Brian Cain , Catalin Marinas , Christophe Leroy , Fenghua Yu , Geert Uytterhoeven , Guan Xuetao , James Morse , Jonas Bonn , Julien Thierry , Ley Foon Tan , Marc Zyngier , Michael Ellerman , Paul Mackerras , Rich Felker , Russell King , Stafford Horne , Stefan Kristiansson From: Christophe Leroy 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 Signed-off-by: Mike Rapoport --- 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