From mboxrd@z Thu Jan 1 00:00:00 1970 From: harryxiyou@gmail.com (harryxiyou) Date: Thu, 31 May 2012 01:37:42 +0800 Subject: [RFC]confusions about 'struct' define In-Reply-To: References: Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org On Thu, May 31, 2012 at 1:20 AM, Gaurav Jain wrote: Hi Gaurav, > Those are forward declarations as they are being used in defining struct > bus_attribute. It's nothing special about GNU-C. That's the case for ANSI-C > too. Pretty standard. > Hmmm.., that is to say, they may be used before definitions in this file or defined in other files like 'struct iommu_ops;' field (Actually, i can not find this field's definition in this file). However, if it has been defined in other header files, we need not declare here, right? -- Thanks Harry Wei