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From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-mm@kvack.org, akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Christoph Hellwig <hch@infradead.org>,
	linux-arch@vger.kernel.org
Subject: [PATCH V2 02/30] mm/mmap: Clarify protection_map[] indices
Date: Mon, 21 Feb 2022 12:08:11 +0530	[thread overview]
Message-ID: <1645425519-9034-3-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1645425519-9034-1-git-send-email-anshuman.khandual@arm.com>

protection_map[] maps vm_flags access combinations into page protection
value as defined by the platform via __PXXX and __SXXX macros. The array
indices in protection_map[], represents vm_flags access combinations but
it's not very intuitive to derive. This makes it clear and explicit.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 mm/mmap.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 1e8fdb0b51ed..670c68f5fbf1 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -102,8 +102,22 @@ static void unmap_region(struct mm_struct *mm,
  *								x: (yes) yes
  */
 pgprot_t protection_map[16] __ro_after_init = {
-	__P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
-	__S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
+	[VM_NONE]					= __P000,
+	[VM_READ]					= __P001,
+	[VM_WRITE]					= __P010,
+	[VM_WRITE | VM_READ]				= __P011,
+	[VM_EXEC]					= __P100,
+	[VM_EXEC | VM_READ]				= __P101,
+	[VM_EXEC | VM_WRITE]				= __P110,
+	[VM_EXEC | VM_WRITE | VM_READ]			= __P111,
+	[VM_SHARED]					= __S000,
+	[VM_SHARED | VM_READ]				= __S001,
+	[VM_SHARED | VM_WRITE]				= __S010,
+	[VM_SHARED | VM_WRITE | VM_READ]		= __S011,
+	[VM_SHARED | VM_EXEC]				= __S100,
+	[VM_SHARED | VM_EXEC | VM_READ]			= __S101,
+	[VM_SHARED | VM_EXEC | VM_WRITE]		= __S110,
+	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= __S111
 };
 
 #ifndef CONFIG_ARCH_HAS_FILTER_PGPROT
-- 
2.25.1


  parent reply	other threads:[~2022-02-21  6:39 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-21  6:38 [PATCH V2 00/30] mm/mmap: Drop protection_map[] and platform's __SXXX/__PXXX requirements Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 01/30] mm/debug_vm_pgtable: Drop protection_map[] usage Anshuman Khandual
2022-02-21  6:38 ` Anshuman Khandual [this message]
2022-02-21  6:38 ` [PATCH V2 03/30] mm/mmap: Add new config ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 04/30] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-02-21  6:38   ` Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 05/30] arm64/mm: " Anshuman Khandual
2022-02-21  6:38   ` Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 06/30] sparc/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 07/30] mips/mm: " Anshuman Khandual
2022-02-21  9:55   ` Thomas Bogendoerfer
2022-02-21  6:38 ` [PATCH V2 08/30] m68k/mm: " Anshuman Khandual
2022-02-21 11:54   ` Geert Uytterhoeven
2022-02-22  5:44     ` Anshuman Khandual
2022-02-25  9:02     ` Geert Uytterhoeven
2022-02-25  9:35       ` Anshuman Khandual
2022-04-22  6:55   ` kernel test robot
2022-02-21  6:38 ` [PATCH V2 09/30] arm/mm: " Anshuman Khandual
2022-02-21  6:38   ` Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 10/30] x86/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 11/30] mm/mmap: Drop protection_map[] Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 12/30] mm/mmap: Drop arch_filter_pgprot() Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 13/30] mm/mmap: Drop arch_vm_get_page_pgprot() Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 14/30] s390/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-02-21  7:09   ` Sven Schnelle
2022-02-23 11:18   ` Alexander Gordeev
2022-02-21  6:38 ` [PATCH V2 15/30] riscv/mm: " Anshuman Khandual
2022-02-21  6:38   ` Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 16/30] alpha/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 17/30] sh/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 18/30] arc/mm: " Anshuman Khandual
2022-02-21  6:38   ` Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 19/30] csky/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 20/30] extensa/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 21/30] parisc/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 22/30] openrisc/mm: " Anshuman Khandual
2022-02-21  6:38   ` [OpenRISC] " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 23/30] um/mm: " Anshuman Khandual
2022-02-21  6:38   ` Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 24/30] microblaze/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 25/30] nios2/mm: " Anshuman Khandual
2022-02-22 22:56   ` Dinh Nguyen
2022-02-21  6:38 ` [PATCH V2 26/30] hexagon/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 27/30] nds32/mm: " Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 28/30] ia64/mm: " Anshuman Khandual
2022-02-21  6:50   ` Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 29/30] mm/mmap: Drop generic vm_get_page_prot() Anshuman Khandual
2022-02-21  6:38 ` [PATCH V2 30/30] mm/mmap: Drop ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual

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