Re: [PATCH U-BOOT v3 03/30] fs: btrfs: Crossport btrfs_read_dev_super() from btrfs-progs

On Wed, Jun 24, 2020 at 06:02:49PM +0200, Marek Behún wrote:

From: Qu Wenruo wqu@suse.com

This patch uses generic code from btrfs-progs to read one super block from block device.

[snip]

+/* Provide a compatibility layer to make code syncing easier */

+/* A simple wraper to for error() used in btrfs-progs */ +__attribute__((format (__printf__, 1, 2))) +static inline void error(const char *fmt, ...) +{

• printf("BTRFS: ");
• printf(fmt, __builtin_va_arg_pack());
• printf("\n");

+}

Note that this does not work with LLVM (no __builtin_va_arg_pack()). I'm reworking this call pr_err(...) under the hood instead, with "BTRFS: " included in the message.