From: Mike Rapoport <rppt@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Borislav Petkov <bp@alien8.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Christopher Lameter <cl@linux.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Hildenbrand <david@redhat.com>,
Elena Reshetova <elena.reshetova@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Idan Yaniv <idan.yaniv@ibm.com>,
Ingo Molnar <mingo@redhat.com>,
James Bottomley <jejb@linux.ibm.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Matthew Wilcox <willy@infradead.org>,
Mark Rutland <mark.rutland@arm.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Mike Rapoport <rppt@kernel.org>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Tycho Andersen <tycho@tycho.ws>, Will Deacon <will@kernel.org>,
linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org,
linux-riscv@lists.infradead.org, x86@kernel.org
Subject: [PATCH v5 1/5] mm: add definition of PMD_PAGE_ORDER
Date: Wed, 16 Sep 2020 10:35:35 +0300 [thread overview]
Message-ID: <20200916073539.3552-2-rppt@kernel.org> (raw)
In-Reply-To: <20200916073539.3552-1-rppt@kernel.org>
From: Mike Rapoport <rppt@linux.ibm.com>
The definition of PMD_PAGE_ORDER denoting the number of base pages in the
second-level leaf page is already used by DAX and maybe handy in other
cases as well.
Several architectures already have definition of PMD_ORDER as the size of
second level page table, so to avoid conflict with these definitions use
PMD_PAGE_ORDER name and update DAX respectively.
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
fs/dax.c | 11 ++++-------
include/linux/pgtable.h | 3 +++
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 994ab66a9907..c0b9aa4bda9e 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -49,9 +49,6 @@ static inline unsigned int pe_order(enum page_entry_size pe_size)
#define PG_PMD_COLOUR ((PMD_SIZE >> PAGE_SHIFT) - 1)
#define PG_PMD_NR (PMD_SIZE >> PAGE_SHIFT)
-/* The order of a PMD entry */
-#define PMD_ORDER (PMD_SHIFT - PAGE_SHIFT)
-
static wait_queue_head_t wait_table[DAX_WAIT_TABLE_ENTRIES];
static int __init init_dax_wait_table(void)
@@ -98,7 +95,7 @@ static bool dax_is_locked(void *entry)
static unsigned int dax_entry_order(void *entry)
{
if (xa_to_value(entry) & DAX_PMD)
- return PMD_ORDER;
+ return PMD_PAGE_ORDER;
return 0;
}
@@ -1455,7 +1452,7 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
{
struct vm_area_struct *vma = vmf->vma;
struct address_space *mapping = vma->vm_file->f_mapping;
- XA_STATE_ORDER(xas, &mapping->i_pages, vmf->pgoff, PMD_ORDER);
+ XA_STATE_ORDER(xas, &mapping->i_pages, vmf->pgoff, PMD_PAGE_ORDER);
unsigned long pmd_addr = vmf->address & PMD_MASK;
bool write = vmf->flags & FAULT_FLAG_WRITE;
bool sync;
@@ -1514,7 +1511,7 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
* entry is already in the array, for instance), it will return
* VM_FAULT_FALLBACK.
*/
- entry = grab_mapping_entry(&xas, mapping, PMD_ORDER);
+ entry = grab_mapping_entry(&xas, mapping, PMD_PAGE_ORDER);
if (xa_is_internal(entry)) {
result = xa_to_internal(entry);
goto fallback;
@@ -1680,7 +1677,7 @@ dax_insert_pfn_mkwrite(struct vm_fault *vmf, pfn_t pfn, unsigned int order)
if (order == 0)
ret = vmf_insert_mixed_mkwrite(vmf->vma, vmf->address, pfn);
#ifdef CONFIG_FS_DAX_PMD
- else if (order == PMD_ORDER)
+ else if (order == PMD_PAGE_ORDER)
ret = vmf_insert_pfn_pmd(vmf, pfn, FAULT_FLAG_WRITE);
#endif
else
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index e8cbc2e795d5..b0389078df39 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -28,6 +28,9 @@
#define USER_PGTABLES_CEILING 0UL
#endif
+/* Number of base pages in a second level leaf page */
+#define PMD_PAGE_ORDER (PMD_SHIFT - PAGE_SHIFT)
+
/*
* A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD]
*
--
2.28.0
next prev parent reply other threads:[~2020-09-16 7:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-16 7:35 [PATCH v5 0/5] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-09-16 7:35 ` Mike Rapoport [this message]
2020-09-16 7:35 ` [PATCH v5 2/5] mmap: make mlock_future_check() global Mike Rapoport
2020-09-16 7:35 ` [PATCH v5 3/5] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-09-16 15:59 ` Randy Dunlap
2020-09-16 7:35 ` [PATCH v5 4/5] arch, mm: wire up memfd_secret system call were relevant Mike Rapoport
2020-09-16 7:35 ` [PATCH v5 5/5] mm: secretmem: use PMD-size pages to amortize direct map fragmentation Mike Rapoport
2020-09-16 23:20 ` [PATCH v5 0/5] mm: introduce memfd_secret system call to create "secret" memory areas Andrew Morton
2020-09-17 5:46 ` Michael Kerrisk (man-pages)
2020-09-17 6:02 ` Mike Rapoport
2020-09-17 6:00 ` Mike Rapoport
2020-09-17 13:27 ` Qian Cai
2020-09-18 18:25 ` Qian Cai
2020-09-21 8:07 ` Stephen Rothwell
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