erofs-utils: add ERR_CAST macro

Add ERR_CAST macro to prepare for the upcoming tarerofs feature.

Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230711061240.23662-1-jefflexu@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

diff --git a/include/erofs/err.h b/include/erofs/err.h
index 08b0bdba59e1bcde62a50920f513b9f97304c18f..2ae9e215a28bd1bea21590bd18c08917f334c20b 100644 (file)
--- a/include/erofs/err.h
+++ b/include/erofs/err.h
@@ -33,6 +33,12 @@ static inline long PTR_ERR(const void *ptr)
        return (long) ptr;
 }
 
+static inline void * ERR_CAST(const void *ptr)
+{
+       /* cast away the const */
+       return (void *) ptr;
+}
+
 #ifdef __cplusplus
 }
 #endif