linux-kernel - Re: [PATCHv3 1/3] mm: Introduce vma

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Message-Id: <20180725124201.bcfec6827706fc87273f05bb@linux-foundation.org>
Date:   Wed, 25 Jul 2018 12:42:01 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 1/3] mm: Introduce vma_init()

On Wed, 25 Jul 2018 15:39:24 +0300 "Kirill A. Shutemov" <kirill@...temov.name> wrote:

> There are few more:
> 
> arch/arm64/include/asm/tlb.h:   struct vm_area_struct vma = { .vm_mm = tlb->mm, };
> arch/arm64/mm/hugetlbpage.c:    struct vm_area_struct vma = { .vm_mm = mm };
> arch/arm64/mm/hugetlbpage.c:    struct vm_area_struct vma = { .vm_mm = mm };

I'n not understanding.  Your "mm: use vma_init() to initialize VMAs on
stack and data segments" addressed all those?

--- a/arch/arm64/include/asm/tlb.h~mm-use-vma_init-to-initialize-vmas-on-stack-and-data-segments
+++ a/arch/arm64/include/asm/tlb.h
@@ -37,7 +37,9 @@ static inline void __tlb_remove_table(vo
 
 static inline void tlb_flush(struct mmu_gather *tlb)
 {
-	struct vm_area_struct vma = { .vm_mm = tlb->mm, };
+	struct vm_area_struct vma;
+
+	vma_init(&vma, tlb->mm);
 
 	/*
 	 * The ASID allocator will either invalidate the ASID or mark
--- a/arch/arm64/mm/hugetlbpage.c~mm-use-vma_init-to-initialize-vmas-on-stack-and-data-segments
+++ a/arch/arm64/mm/hugetlbpage.c
@@ -108,11 +108,13 @@ static pte_t get_clear_flush(struct mm_s
 			     unsigned long pgsize,
 			     unsigned long ncontig)
 {
-	struct vm_area_struct vma = { .vm_mm = mm };
+	struct vm_area_struct vma;
 	pte_t orig_pte = huge_ptep_get(ptep);
 	bool valid = pte_valid(orig_pte);
 	unsigned long i, saddr = addr;
 
+	vma_init(&vma, mm);
+
 	for (i = 0; i < ncontig; i++, addr += pgsize, ptep++) {
 		pte_t pte = ptep_get_and_clear(mm, addr, ptep);
 
@@ -145,9 +147,10 @@ static void clear_flush(struct mm_struct
 			     unsigned long pgsize,
 			     unsigned long ncontig)
 {
-	struct vm_area_struct vma = { .vm_mm = mm };
+	struct vm_area_struct vma;
 	unsigned long i, saddr = addr;
 
+	vma_init(&vma, mm);
 	for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
 		pte_clear(mm, addr, ptep);