From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, hch@infradead.org,
akpm@linux-foundation.org,
Anshuman Khandual <anshuman.khandual@arm.com>
Subject: [RFC V1 31/31] mm/mmap: Define macros for vm_flags access permission combinations
Date: Mon, 24 Jan 2022 18:27:08 +0530 [thread overview]
Message-ID: <1643029028-12710-32-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1643029028-12710-1-git-send-email-anshuman.khandual@arm.com>
These macros will be useful in cleaning up the all those switch statements
in vm_get_page_prot() across all platforms.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
include/linux/mm.h | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6c0844b99b3e..b3691eeec500 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2828,6 +2828,45 @@ static inline bool range_in_vma(struct vm_area_struct *vma,
return (vma && vma->vm_start <= start && end <= vma->vm_end);
}
+/*
+ * Access permission related vm_flags combination is used to map into
+ * platform defined page protection flags. This enumeration helps in
+ * abstracting out possible indices after vm_flags is probed for all
+ * access permission i.e (VM_SHARED | VM_EXEC | VM_READ | VM_WRITE).
+ *
+ * VM_EXEC ---------------------|
+ * |
+ * VM_WRITE ---------------| |
+ * | |
+ * VM_READ -----------| | |
+ * | | |
+ * VM_SHARED ----| | | |
+ * | | | |
+ * v v v v
+ * VMFLAGS_IDX_(S|X)(R|X)(W|X)(E|X)
+ *
+ * X - Indicates that the access flag is absent
+ */
+enum vmflags_idx {
+ VMFLAGS_IDX_XXXX, /* (VM_NONE) */
+ VMFLAGS_IDX_XRXX, /* (VM_READ) */
+ VMFLAGS_IDX_XXWX, /* (VM_WRITE) */
+ VMFLAGS_IDX_XRWX, /* (VM_READ | VM_WRITE) */
+ VMFLAGS_IDX_XXXE, /* (VM_EXEC) */
+ VMFLAGS_IDX_XRXE, /* (VM_EXEC | VM_READ) */
+ VMFLAGS_IDX_XXWE, /* (VM_EXEC | VM_WRITE) */
+ VMFLAGS_IDX_XRWE, /* (VM_EXEC | VM_READ | VM_WRITE) */
+ VMFLAGS_IDX_SXXX, /* (VM_SHARED | VM_NONE) */
+ VMFLAGS_IDX_SRXX, /* (VM_SHARED | VM_READ) */
+ VMFLAGS_IDX_SXWX, /* (VM_SHARED | VM_WRITE) */
+ VMFLAGS_IDX_SRWX, /* (VM_SHARED | VM_READ | VM_WRITE) */
+ VMFLAGS_IDX_SXXE, /* (VM_SHARED | VM_EXEC) */
+ VMFLAGS_IDX_SRXE, /* (VM_SHARED | VM_EXEC | VM_READ) */
+ VMFLAGS_IDX_SXWE, /* (VM_SHARED | VM_EXEC | VM_WRITE) */
+ VMFLAGS_IDX_SRWE, /* (VM_SHARED | VM_EXEC | VM_READ | VM_WRITE) */
+ VMFLAGS_IDX_MAX
+};
+
#ifdef CONFIG_MMU
pgprot_t vm_get_page_prot(unsigned long vm_flags);
void vma_set_page_prot(struct vm_area_struct *vma);
--
2.25.1
next prev parent reply other threads:[~2022-01-24 12:59 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 12:56 [RFC V1 00/31] mm/mmap: Drop protection_map[] and platform's __SXXX/__PXXX requirements Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 01/31] mm/debug_vm_pgtable: Directly use vm_get_page_prot() Anshuman Khandual
2022-01-26 7:15 ` Christoph Hellwig
2022-01-27 4:16 ` Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 02/31] mm/mmap: Clarify protection_map[] indices Anshuman Khandual
2022-01-26 7:16 ` Christoph Hellwig
2022-01-27 4:07 ` Anshuman Khandual
2022-01-27 12:39 ` Mike Rapoport
2022-01-31 3:25 ` Anshuman Khandual
2022-02-05 9:10 ` Firo Yang
2022-02-09 3:23 ` Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 03/31] mm/mmap: Add new config ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 04/31] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-02-03 18:15 ` Mike Rapoport
2022-02-04 2:57 ` Anshuman Khandual
2022-02-04 4:44 ` Mike Rapoport
2022-01-24 12:56 ` [RFC V1 05/31] arm64/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 06/31] sparc/mm: " Anshuman Khandual
2022-01-24 12:58 ` David Miller
2022-01-24 18:21 ` Khalid Aziz
2022-01-24 12:56 ` [RFC V1 07/31] mips/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 08/31] m68k/mm: " Anshuman Khandual
2022-01-24 14:13 ` Andreas Schwab
2022-01-25 3:42 ` Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 09/31] arm/mm: " Anshuman Khandual
2022-01-24 17:06 ` Russell King (Oracle)
2022-01-25 3:36 ` Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 10/31] x86/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 11/31] mm/mmap: Drop protection_map[] Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 12/31] mm/mmap: Drop arch_filter_pgprot() Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 13/31] mm/mmap: Drop arch_vm_get_page_pgprot() Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 14/31] s390/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 15/31] riscv/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 16/31] alpha/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 17/31] sh/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 18/31] arc/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 19/31] csky/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 20/31] extensa/mm: " Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 21/31] parisc/mm: " Anshuman Khandual
2022-01-25 16:53 ` Rolf Eike Beer
2022-01-27 4:06 ` Anshuman Khandual
2022-01-24 12:56 ` [RFC V1 22/31] openrisc/mm: " Anshuman Khandual
2022-02-05 6:58 ` [OpenRISC] " Stafford Horne
2022-01-24 12:57 ` [RFC V1 23/31] um/mm: " Anshuman Khandual
2022-01-24 12:57 ` [RFC V1 24/31] microblaze/mm: " Anshuman Khandual
2022-01-24 12:57 ` [RFC V1 25/31] nios2/mm: " Anshuman Khandual
2022-01-26 16:38 ` Dinh Nguyen
2022-01-24 12:57 ` [RFC V1 26/31] hexagon/mm: " Anshuman Khandual
2022-01-24 12:57 ` [RFC V1 27/31] nds32/mm: " Anshuman Khandual
2022-01-24 12:57 ` [RFC V1 28/31] ia64/mm: " Anshuman Khandual
2022-01-24 12:57 ` [RFC V1 29/31] mm/mmap: Drop generic vm_get_page_prot() Anshuman Khandual
2022-01-24 12:57 ` [RFC V1 30/31] mm/mmap: Drop ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-01-24 12:57 ` Anshuman Khandual [this message]
2022-02-03 5:24 ` [RFC V1 31/31] mm/mmap: Define macros for vm_flags access permission combinations Anshuman Khandual
2022-01-27 12:38 ` [RFC V1 00/31] mm/mmap: Drop protection_map[] and platform's __SXXX/__PXXX requirements Mike Rapoport
2022-01-31 3:35 ` Anshuman Khandual
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1643029028-12710-32-git-send-email-anshuman.khandual@arm.com \
--to=anshuman.khandual@arm.com \
--cc=akpm@linux-foundation.org \
--cc=hch@infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).