Doubt regarding PageLocked in Linux kernel source

[Ram Tummala]

On Apr 19, 2012, at 12:15 AM, Shashidhara Shamaiah <
Shashidhara.Shamaiah at mphasis.com> wrote:

  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.


Yes, it's not a function, it's a macro. Page flags are cleverly implemented
in the Linux kernel as macros. You wont be able to cscope into it. See
http://lxr.linux.no/linux+v3.3.2/include/linux/page-flags.h for
implementation details.

Venkatram Tummala



Regards

Shashidhara

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