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Message-ID: <476aa5a107994d293dcdfc5a620cc52f625768c2.1681430907.git.ackerleytng@google.com>
Date:   Fri, 14 Apr 2023 00:11:50 +0000
From:   Ackerley Tng <ackerleytng@...gle.com>
To:     kvm@...r.kernel.org, linux-api@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, qemu-devel@...gnu.org
Cc:     aarcange@...hat.com, ak@...ux.intel.com, akpm@...ux-foundation.org,
        arnd@...db.de, bfields@...ldses.org, bp@...en8.de,
        chao.p.peng@...ux.intel.com, corbet@....net, dave.hansen@...el.com,
        david@...hat.com, ddutile@...hat.com, dhildenb@...hat.com,
        hpa@...or.com, hughd@...gle.com, jlayton@...nel.org,
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        seanjc@...gle.com, shuah@...nel.org, steven.price@....com,
        tabba@...gle.com, tglx@...utronix.de, vannapurve@...gle.com,
        vbabka@...e.cz, vkuznets@...hat.com, wanpengli@...cent.com,
        wei.w.wang@...el.com, x86@...nel.org, yu.c.zhang@...ux.intel.com,
        muchun.song@...ux.dev, feng.tang@...el.com, brgerst@...il.com,
        rdunlap@...radead.org, masahiroy@...nel.org,
        mailhol.vincent@...adoo.fr, Ackerley Tng <ackerleytng@...gle.com>
Subject: [RFC PATCH 1/6] mm: shmem: Refactor out shmem_shared_policy() function

Refactor out shmem_shared_policy() to allow reading of a file's shared
mempolicy

Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
 include/linux/shmem_fs.h |  7 +++++++
 mm/shmem.c               | 10 ++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index d9e57485a686..bc1eeb4b4bd9 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -134,6 +134,13 @@ static inline bool shmem_file(struct file *file)
 	return shmem_mapping(file->f_mapping);
 }
 
+static inline struct shared_policy *shmem_shared_policy(struct file *file)
+{
+	struct inode *inode = file_inode(file);
+
+	return &SHMEM_I(inode)->policy;
+}
+
 /*
  * If fallocate(FALLOC_FL_KEEP_SIZE) has been used, there may be pages
  * beyond i_size's notion of EOF, which fallocate has committed to reserving:
diff --git a/mm/shmem.c b/mm/shmem.c
index b053cd1f12da..4f801f398454 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2248,20 +2248,22 @@ unsigned long shmem_get_unmapped_area(struct file *file,
 }
 
 #ifdef CONFIG_NUMA
+
 static int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *mpol)
 {
-	struct inode *inode = file_inode(vma->vm_file);
-	return mpol_set_shared_policy(&SHMEM_I(inode)->policy, vma, mpol);
+	struct shared_policy *info;
+
+	info = shmem_shared_policy(vma->vm_file);
+	return mpol_set_shared_policy(info, vma, mpol);
 }
 
 static struct mempolicy *shmem_get_policy(struct vm_area_struct *vma,
 					  unsigned long addr)
 {
-	struct inode *inode = file_inode(vma->vm_file);
 	pgoff_t index;
 
 	index = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
-	return mpol_shared_policy_lookup(&SHMEM_I(inode)->policy, index);
+	return mpol_shared_policy_lookup(shmem_shared_policy(vma->vm_file), index);
 }
 #endif
 
-- 
2.40.0.634.g4ca3ef3211-goog

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