From mboxrd@z Thu Jan  1 00:00:00 1970
From: me@tobin.cc (Tobin C. Harding)
Date: Thu, 30 Mar 2017 09:59:44 +1100
Subject: 0 bit shift
Message-ID: <20170329225944.GG25014@eros>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

What is the reason for the zero bit shift in this code please?

#define SDIO_STATE_PRESENT	(1<<0)		/* present in sysfs */

file: include/linux/mmc/sdio_func.h

thanks,
Tobin.