linux-kernel - [RFC v2 26/43] mm: shmem: specify the mm to use when inserting pages

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Date:   Tue, 30 Mar 2021 14:36:01 -0700
From:   Anthony Yznaga <anthony.yznaga@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     willy@...radead.org, corbet@....net, tglx@...utronix.de,
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Subject: [RFC v2 26/43] mm: shmem: specify the mm to use when inserting pages

Explicitly specify the mm to pass to shmem_insert_page() when
the pkram_stream is initialized rather than use the mm of the
current thread.  This will allow for multiple kernel threads to
target the same mm when inserting pages in parallel.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 mm/shmem_pkram.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/shmem_pkram.c b/mm/shmem_pkram.c
index 904b1b861ce5..8682b0c002c0 100644
--- a/mm/shmem_pkram.c
+++ b/mm/shmem_pkram.c
@@ -225,7 +225,7 @@ int shmem_save_pkram(struct super_block *sb)
 	return err;
 }
 
-static int load_file_content(struct pkram_stream *ps, struct address_space *mapping)
+static int load_file_content(struct pkram_stream *ps, struct address_space *mapping, struct mm_struct *mm)
 {
 	PKRAM_ACCESS(pa, ps, pages);
 	unsigned long index;
@@ -237,7 +237,7 @@ static int load_file_content(struct pkram_stream *ps, struct address_space *mapp
 		if (!page)
 			break;
 
-		err = shmem_insert_page(current->mm, mapping->host, index, page);
+		err = shmem_insert_page(mm, mapping->host, index, page);
 		put_page(page);
 		cond_resched();
 	} while (!err);
@@ -291,7 +291,7 @@ static int load_file(struct dentry *parent, struct pkram_stream *ps,
 	inode->i_ctime = ns_to_timespec64(hdr.ctime);
 	i_size_write(inode, hdr.size);
 
-	err = load_file_content(ps, inode->i_mapping);
+	err = load_file_content(ps, inode->i_mapping, current->mm);
 out_unlock:
 	inode_unlock(d_inode(parent));
 out:
-- 
1.8.3.1