Hi, I was looking at the source file fs/jbd/transaction.c . In the function journal_invalidatepage the code calls the macro PageLocked . I need to look at its implementation. I could locate where the definition of PageLocked. Its not a function as its absent in the System.map file. I have searched in internet. It was defined as a macro in older kernels. But I could not get its definition in the recent kernels. Please point me to the right direction. Regards Shashidhara Information transmitted by this e-mail is proprietary to MphasiS, its associated companies and/ or its customers and is intended for use only by the individual or entity to which it is addressed, and may contain information that is privileged, confidential or exempt from disclosure under applicable law. If you are not the intended recipient or it appears that this mail has been forwarded to you without proper authority, you are notified that any use or dissemination of this information in any manner is strictly prohibited. In such cases, please notify us immediately at mailmaster@mphasis.com and delete this mail from your records.