LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Li Wang <liwang@redhat.com>, Guenter Roeck <linux@roeck-us.net>,
	Janosch Frank <frankja@linux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: [PATCH 2/4] mm: introduce mm_[p4d|pud|pmd]_folded
Date: Wed, 31 Oct 2018 13:59:59 +0100	[thread overview]
Message-ID: <1540990801-4261-3-git-send-email-schwidefsky@de.ibm.com> (raw)
In-Reply-To: <1540990801-4261-1-git-send-email-schwidefsky@de.ibm.com>

Add three architecture overrideable functions to test if the
p4d, pud, or pmd layer of a page table is folded or not.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
 include/asm-generic/pgtable.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 5657a20..359fb93 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -1127,4 +1127,20 @@ static inline bool arch_has_pfn_modify_check(void)
 #endif
 #endif
 
+/*
+ * On some architectures it depends on the mm if the p4d/pud or pmd
+ * layer of the page table hierarchy is folded or not.
+ */
+#ifndef mm_p4d_folded
+#define mm_p4d_folded(mm)	__is_defined(__PAGETABLE_P4D_FOLDED)
+#endif
+
+#ifndef mm_pud_folded
+#define mm_pud_folded(mm)	__is_defined(__PAGETABLE_PUD_FOLDED)
+#endif
+
+#ifndef mm_pmd_folded
+#define mm_pmd_folded(mm)	__is_defined(__PAGETABLE_PMD_FOLDED)
+#endif
+
 #endif /* _ASM_GENERIC_PGTABLE_H */
-- 
2.7.4


  parent reply	other threads:[~2018-10-31 13:00 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-31 12:59 [PATCH 0/4] pgtable bytes mis-accounting v3 Martin Schwidefsky
2018-10-31 12:59 ` [PATCH 1/4] mm: make the __PAGETABLE_PxD_FOLDED defines non-empty Martin Schwidefsky
2018-10-31 13:23   ` Kirill A. Shutemov
2018-10-31 12:59 ` Martin Schwidefsky [this message]
2018-10-31 13:23   ` [PATCH 2/4] mm: introduce mm_[p4d|pud|pmd]_folded Kirill A. Shutemov
2018-10-31 13:00 ` [PATCH 3/4] mm: add mm_pxd_folded checks to pgtable_bytes accounting functions Martin Schwidefsky
2018-10-31 13:00 ` [PATCH 4/4] s390/mm: fix mis-accounting of pgtable_bytes Martin Schwidefsky

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=1540990801-4261-3-git-send-email-schwidefsky@de.ibm.com \
    --to=schwidefsky@de.ibm.com \
    --cc=frankja@linux.vnet.ibm.com \
    --cc=heiko.carstens@de.ibm.com \
    --cc=kirill.shutemov@linux.intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=linux@roeck-us.net \
    --cc=liwang@redhat.com \
    --subject='Re: [PATCH 2/4] mm: introduce mm_[p4d|pud|pmd]_folded' \
    /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

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).