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
next prev 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
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