[merged mm-stable] mm-shmem-refactor-to-reuse-vfs_parse_monolithic_sep-for-option-parsing.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: mm/shmem: refactor to reuse vfs_parse_monolithic_sep for option parsing
has been removed from the -mm tree.  Its filename was
     mm-shmem-refactor-to-reuse-vfs_parse_monolithic_sep-for-option-parsing.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Guo Weikang <guoweikang.kernel@gmail.com>
Subject: mm/shmem: refactor to reuse vfs_parse_monolithic_sep for option parsing
Date: Thu, 5 Dec 2024 17:45:21 +0800

shmem_parse_options() is refactored to use vfs_parse_monolithic_sep() with
a custom separator function, shmem_next_opt().  This eliminates redundant
logic for parsing comma-separated options and ensures consistency with
other kernel code that uses the same interface.

The vfs_parse_monolithic_sep() helper was introduced in commit
e001d1447cd4 ("fs: factor out vfs_parse_monolithic_sep() helper").

Link: https://lkml.kernel.org/r/20241205094521.1244678-1-guoweikang.kernel@gmail.com
Signed-off-by: Guo Weikang <guoweikang.kernel@gmail.com>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/shmem.c |   67 +++++++++++++++++++++------------------------------
 1 file changed, 28 insertions(+), 39 deletions(-)

--- a/mm/shmem.c~mm-shmem-refactor-to-reuse-vfs_parse_monolithic_sep-for-option-parsing
+++ a/mm/shmem.c
@@ -4647,48 +4647,37 @@ bad_value:
 	return invalfc(fc, "Bad value for '%s'", param->key);
 }
 
-static int shmem_parse_options(struct fs_context *fc, void *data)
+static char *shmem_next_opt(char **s)
 {
-	char *options = data;
+	char *sbegin = *s;
+	char *p;
 
-	if (options) {
-		int err = security_sb_eat_lsm_opts(options, &fc->security);
-		if (err)
-			return err;
-	}
-
-	while (options != NULL) {
-		char *this_char = options;
-		for (;;) {
-			/*
-			 * NUL-terminate this option: unfortunately,
-			 * mount options form a comma-separated list,
-			 * but mpol's nodelist may also contain commas.
-			 */
-			options = strchr(options, ',');
-			if (options == NULL)
-				break;
-			options++;
-			if (!isdigit(*options)) {
-				options[-1] = '\0';
-				break;
-			}
-		}
-		if (*this_char) {
-			char *value = strchr(this_char, '=');
-			size_t len = 0;
-			int err;
-
-			if (value) {
-				*value++ = '\0';
-				len = strlen(value);
-			}
-			err = vfs_parse_fs_string(fc, this_char, value, len);
-			if (err < 0)
-				return err;
+	if (sbegin == NULL)
+		return NULL;
+
+	/*
+	 * NUL-terminate this option: unfortunately,
+	 * mount options form a comma-separated list,
+	 * but mpol's nodelist may also contain commas.
+	 */
+	for (;;) {
+		p = strchr(*s, ',');
+		if (p == NULL)
+			break;
+		*s = p + 1;
+		if (!isdigit(*(p+1))) {
+			*p = '\0';
+			return sbegin;
 		}
 	}
-	return 0;
+
+	*s = NULL;
+	return sbegin;
+}
+
+static int shmem_parse_monolithic(struct fs_context *fc, void *data)
+{
+	return vfs_parse_monolithic_sep(fc, data, shmem_next_opt);
 }
 
 /*
@@ -5038,7 +5027,7 @@ static const struct fs_context_operation
 	.free			= shmem_free_fc,
 	.get_tree		= shmem_get_tree,
 #ifdef CONFIG_TMPFS
-	.parse_monolithic	= shmem_parse_options,
+	.parse_monolithic	= shmem_parse_monolithic,
 	.parse_param		= shmem_parse_one,
 	.reconfigure		= shmem_reconfigure,
 #endif
_

Patches currently in -mm which might be from guoweikang.kernel@gmail.com are

mm-memblock-add-memblock_alloc_or_panic-interface.patch
arch-s390-save_area_alloc-default-failure-behavior-changed-to-panic.patch