linux-kernel - [RFC V1 29/31] mm/mmap: Drop generic vm_get_page

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Date:   Mon, 24 Jan 2022 18:27:06 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, hch@...radead.org,
        akpm@...ux-foundation.org,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: [RFC V1 29/31] mm/mmap: Drop generic vm_get_page_prot()

All available platforms export their own vm_get_page_prot() implementation
via ARCH_HAS_VM_GET_PAGE_PROT. Hence a generic implementation is no longer
needed.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 mm/mmap.c | 40 ----------------------------------------
 1 file changed, 40 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 2fc597cf8b8d..368bc8aee45b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -102,46 +102,6 @@ static void unmap_region(struct mm_struct *mm,
  *								w: (no) no
  *								x: (yes) yes
  */
-pgprot_t vm_get_page_prot(unsigned long vm_flags)
-{
-	switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) {
-	case VM_NONE:
-		return __P000;
-	case VM_READ:
-		return __P001;
-	case VM_WRITE:
-		return __P010;
-	case VM_READ | VM_WRITE:
-		return __P011;
-	case VM_EXEC:
-		return __P100;
-	case VM_EXEC | VM_READ:
-		return __P101;
-	case VM_EXEC | VM_WRITE:
-		return __P110;
-	case VM_EXEC | VM_READ | VM_WRITE:
-		return __P111;
-	case VM_SHARED:
-		return __S000;
-	case VM_SHARED | VM_READ:
-		return __S001;
-	case VM_SHARED | VM_WRITE:
-		return __S010;
-	case VM_SHARED | VM_READ | VM_WRITE:
-		return __S011;
-	case VM_SHARED | VM_EXEC:
-		return __S100;
-	case VM_SHARED | VM_EXEC | VM_READ:
-		return __S101;
-	case VM_SHARED | VM_EXEC | VM_WRITE:
-		return __S110;
-	case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
-		return __S111;
-	default:
-		BUILD_BUG();
-	}
-}
-EXPORT_SYMBOL(vm_get_page_prot);
 #endif	/* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */
 
 static pgprot_t vm_pgprot_modify(pgprot_t oldprot, unsigned long vm_flags)
-- 
2.25.1