Patch "erofs: simplify z_erofs_transform_plain()" has been added to the 6.1-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    erofs: simplify z_erofs_transform_plain()

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     erofs-simplify-z_erofs_transform_plain.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-163684-greg=kroah.com@vger.kernel.org Tue Jul 22 12:04:46 2025
From: Gao Xiang <hsiangkao@linux.alibaba.com>
Date: Tue, 22 Jul 2025 18:00:28 +0800
Subject: erofs: simplify z_erofs_transform_plain()
To: stable@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jan Kiszka <jan.kiszka@siemens.com>, Stefan Kerkmann <s.kerkmann@pengutronix.de>
Cc: linux-erofs@lists.ozlabs.org, LKML <linux-kernel@vger.kernel.org>, Gao Xiang <hsiangkao@linux.alibaba.com>, Yue Hu <huyue2@coolpad.com>, Chao Yu <chao@kernel.org>
Message-ID: <20250722100029.3052177-5-hsiangkao@linux.alibaba.com>

From: Gao Xiang <hsiangkao@linux.alibaba.com>

commit c5539762f32e97c5e16215fa1336e32095b8b0fd upstream.

Use memcpy_to_page() instead of open-coding them.

In addition, add a missing flush_dcache_page() even though almost all
modern architectures clear `PG_dcache_clean` flag for new file cache
pages so that it doesn't change anything in practice.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20230627161240.331-2-hsiangkao@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/erofs/decompressor.c |   19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -323,7 +323,7 @@ static int z_erofs_transform_plain(struc
 	const unsigned int lefthalf = rq->outputsize - righthalf;
 	const unsigned int interlaced_offset =
 		rq->alg == Z_EROFS_COMPRESSION_SHIFTED ? 0 : rq->pageofs_out;
-	unsigned char *src, *dst;
+	u8 *src;
 
 	if (outpages > 2 && rq->alg == Z_EROFS_COMPRESSION_SHIFTED) {
 		DBG_BUGON(1);
@@ -336,22 +336,19 @@ static int z_erofs_transform_plain(struc
 	}
 
 	src = kmap_local_page(rq->in[inpages - 1]) + rq->pageofs_in;
-	if (rq->out[0]) {
-		dst = kmap_local_page(rq->out[0]);
-		memcpy(dst + rq->pageofs_out, src + interlaced_offset,
-		       righthalf);
-		kunmap_local(dst);
-	}
+	if (rq->out[0])
+		memcpy_to_page(rq->out[0], rq->pageofs_out,
+			       src + interlaced_offset, righthalf);
 
 	if (outpages > inpages) {
 		DBG_BUGON(!rq->out[outpages - 1]);
 		if (rq->out[outpages - 1] != rq->in[inpages - 1]) {
-			dst = kmap_local_page(rq->out[outpages - 1]);
-			memcpy(dst, interlaced_offset ? src :
-					(src + righthalf), lefthalf);
-			kunmap_local(dst);
+			memcpy_to_page(rq->out[outpages - 1], 0, src +
+					(interlaced_offset ? 0 : righthalf),
+				       lefthalf);
 		} else if (!interlaced_offset) {
 			memmove(src, src + righthalf, lefthalf);
+			flush_dcache_page(rq->in[inpages - 1]);
 		}
 	}
 	kunmap_local(src);


Patches currently in stable-queue which might be from hsiangkao@linux.alibaba.com are

queue-6.1/erofs-sunset-erofs_dbg.patch
queue-6.1/erofs-simplify-z_erofs_transform_plain.patch
queue-6.1/erofs-get-rid-of-debug_one_dentry.patch
queue-6.1/erofs-drop-z_erofs_page_mark_eio.patch
queue-6.1/erofs-address-d-cache-aliasing.patch