From: Ard Biesheuvel <ardb@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu, linux-hardening@vger.kernel.org,
Ard Biesheuvel <ardb@kernel.org>, Will Deacon <will@kernel.org>,
Marc Zyngier <maz@kernel.org>, Fuad Tabba <tabba@google.com>,
Quentin Perret <qperret@google.com>,
Mark Rutland <mark.rutland@arm.com>,
James Morse <james.morse@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>
Subject: [RFC PATCH 10/12] mm: add default definition of p4d_index()
Date: Wed, 26 Jan 2022 18:30:09 +0100 [thread overview]
Message-ID: <20220126173011.3476262-11-ardb@kernel.org> (raw)
In-Reply-To: <20220126173011.3476262-1-ardb@kernel.org>
Implement a default version of p4d_index() similar to how pud/pmd_index
are defined.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
include/linux/pgtable.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index bc8713a76e03..e8aacf6ea207 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -79,6 +79,14 @@ static inline unsigned long pud_index(unsigned long address)
#define pud_index pud_index
#endif
+#ifndef p4d_index
+static inline unsigned long p4d_index(unsigned long address)
+{
+ return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
+}
+#define p4d_index p4d_index
+#endif
+
#ifndef pgd_index
/* Must be a compile-time constant, so implement it as a macro */
#define pgd_index(a) (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
--
2.30.2
next prev parent reply other threads:[~2022-01-26 17:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-26 17:29 [RFC PATCH 00/12] arm64: implement read-only page tables Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 01/12] asm-generic/pgalloc: allow arch to override PMD alloc/free routines Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 02/12] arm64: mm: add helpers to remap page tables read-only/read-write Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 03/12] arm64: mm: use a fixmap slot for user page table modifications Ard Biesheuvel
2022-01-28 16:08 ` Steven Price
2022-01-26 17:30 ` [RFC PATCH 04/12] arm64: mm: remap PGD pages r/o in the linear region after allocation Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 05/12] arm64: mm: remap PUD pages r/o in linear region Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 06/12] arm64: mm: remap PMD " Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 07/12] arm64: mm: remap PTE level user page tables r/o in the " Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 08/12] arm64: mm: remap kernel PTE level " Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 09/12] arm64: mm: remap kernel page tables read-only at end of init Ard Biesheuvel
2022-01-26 17:30 ` Ard Biesheuvel [this message]
2022-01-26 17:30 ` [RFC PATCH 11/12] arm64: efi: use set_pte_at() not set_pte() in order to pass mm pointer Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 12/12] arm64: hugetlb: use set_pte_at() not set_pte() to provide " Ard Biesheuvel
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=20220126173011.3476262-11-ardb@kernel.org \
--to=ardb@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=james.morse@arm.com \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-hardening@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=maz@kernel.org \
--cc=qperret@google.com \
--cc=tabba@google.com \
--cc=will@kernel.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).