[PATCH v4] erofs: make erofs_err() and erofs_info() support NULL sb parameter

[Chunhai Guo]

Make erofs_err() and erofs_info() support NULL sb parameter for more
general usage.

Suggested-by: Gao Xiang <xiang at kernel.org>
Signed-off-by: Chunhai Guo <guochunhai at vivo.com>
---
V3 -> V4: remove unnecessary '\n'
V2 -> V3: convert pr_err() to erofs_err() in erofs codebase
V1 -> V2: add erofs_info()
---
 fs/erofs/decompressor_deflate.c |  2 +-
 fs/erofs/super.c                | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/fs/erofs/decompressor_deflate.c b/fs/erofs/decompressor_deflate.c
index daf3c1bdeab8..4a64a9c91dd3 100644
--- a/fs/erofs/decompressor_deflate.c
+++ b/fs/erofs/decompressor_deflate.c
@@ -70,7 +70,7 @@ int __init z_erofs_deflate_init(void)
 	return 0;
 
 out_failed:
-	pr_err("failed to allocate zlib workspace\n");
+	erofs_err(NULL, "failed to allocate zlib workspace");
 	z_erofs_deflate_exit();
 	return -ENOMEM;
 }
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 3789d6224513..5f60f163bd56 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -27,7 +27,10 @@ void _erofs_err(struct super_block *sb, const char *func, const char *fmt, ...)
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	pr_err("(device %s): %s: %pV", sb->s_id, func, &vaf);
+	if (sb)
+		pr_err("(device %s): %s: %pV", sb->s_id, func, &vaf);
+	else
+		pr_err("%s: %pV", func, &vaf);
 	va_end(args);
 }
 
@@ -41,7 +44,10 @@ void _erofs_info(struct super_block *sb, const char *func, const char *fmt, ...)
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	pr_info("(device %s): %pV", sb->s_id, &vaf);
+	if (sb)
+		pr_info("(device %s): %pV", sb->s_id, &vaf);
+	else
+		pr_info("%pV", &vaf);
 	va_end(args);
 }
 
-- 
2.25.1