Btrfs: fix sparse warning
Fix the following sparse warning: fs/btrfs/send.c:518:51: warning: incorrect type in argument 2 (different address spaces) fs/btrfs/send.c:518:51: expected char const [noderef] <asn:1>*<noident> fs/btrfs/send.c:518:51: got char * We can safely use (const char __user *) with set_fs(KERNEL_DS) __force added to avoid sparse-all warning: fs/btrfs/send.c:518:40: warning: cast adds address space to expression (<asn:1>) Signed-off-by: Fabian Frederick <fabf@skynet.be> Reviewed-by: Zach Brown <zab@zabbo.net> Signed-off-by: Chris Mason <clm@fb.com>
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