From: lauraa@codeaurora.org (Laura Abbott)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv3 1/2] arm64: Introduce {set,clear}_pte_bit
Date: Tue, 12 Aug 2014 16:37:46 -0700 [thread overview]
Message-ID: <1407886667-16919-2-git-send-email-lauraa@codeaurora.org> (raw)
In-Reply-To: <1407886667-16919-1-git-send-email-lauraa@codeaurora.org>
It's useful to be able to change individual bits in ptes at times.
Introduce functions for this and update existing pte_mk* functions
to use these primatives.
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
---
arch/arm64/include/asm/pgtable.h | 33 +++++++++++++++++++--------------
1 file changed, 19 insertions(+), 14 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index ffe1ba0..ca41449 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -149,46 +149,51 @@ extern struct page *empty_zero_page;
#define pte_valid_not_user(pte) \
((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID)
-static inline pte_t pte_wrprotect(pte_t pte)
+static pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
{
- pte_val(pte) &= ~PTE_WRITE;
+ pte_val(pte) &= ~pgprot_val(prot);
return pte;
}
-static inline pte_t pte_mkwrite(pte_t pte)
+static pte_t set_pte_bit(pte_t pte, pgprot_t prot)
{
- pte_val(pte) |= PTE_WRITE;
+ pte_val(pte) |= pgprot_val(prot);
return pte;
}
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+ return clear_pte_bit(pte, __pgprot(PTE_WRITE));
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+ return set_pte_bit(pte, __pgprot(PTE_WRITE));
+}
+
static inline pte_t pte_mkclean(pte_t pte)
{
- pte_val(pte) &= ~PTE_DIRTY;
- return pte;
+ return clear_pte_bit(pte, __pgprot(PTE_DIRTY));
}
static inline pte_t pte_mkdirty(pte_t pte)
{
- pte_val(pte) |= PTE_DIRTY;
- return pte;
+ return set_pte_bit(pte, __pgprot(PTE_DIRTY));
}
static inline pte_t pte_mkold(pte_t pte)
{
- pte_val(pte) &= ~PTE_AF;
- return pte;
+ return clear_pte_bit(pte, __pgprot(PTE_AF));
}
static inline pte_t pte_mkyoung(pte_t pte)
{
- pte_val(pte) |= PTE_AF;
- return pte;
+ return set_pte_bit(pte, __pgprot(PTE_AF));
}
static inline pte_t pte_mkspecial(pte_t pte)
{
- pte_val(pte) |= PTE_SPECIAL;
- return pte;
+ return set_pte_bit(pte, __pgprot(PTE_SPECIAL));
}
static inline void set_pte(pte_t *ptep, pte_t pte)
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2014-08-12 23:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-12 23:37 [PATCHv3 0/2] arm64 CONFIG_DEBUG_SET_MODULE_RONX support Laura Abbott
2014-08-12 23:37 ` Laura Abbott [this message]
2014-08-19 12:06 ` [PATCHv3 1/2] arm64: Introduce {set,clear}_pte_bit Will Deacon
2014-08-12 23:37 ` [PATCHv3 2/2] arm64: Add CONFIG_DEBUG_SET_MODULE_RONX support Laura Abbott
2014-08-19 12:11 ` Will Deacon
2014-08-19 17:21 ` Laura Abbott
2014-08-22 15:45 ` Will Deacon
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=1407886667-16919-2-git-send-email-lauraa@codeaurora.org \
--to=lauraa@codeaurora.org \
--cc=linux-arm-kernel@lists.infradead.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).