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Date: Mon, 6 Jan 2020 14:00:19 +0530 From: Ritesh Harjani <riteshh@...ux.ibm.com> To: linux-ext4@...r.kernel.org Subject: About BUFFER_TRACE macro in include/linux/jbd2.h Hello Community, A very happy new year to all of you!! :) Had some query on BUFFER_TRACE macro. Here it goes:- While debugging some issue w.r.t jbd2/bh I came across this empty macro definition of BUFFER_TRACE in include/linux/jbd2.h. Though this is called from multiple places, but I could not find any definition of this as such. I could see some patches on mailing list which are still calling this macro. So that means I am definitely missing something here. Could you please help me understand how can one use this "BUFFER_TRACE" macro for debugging? I could not find any ftrace event related to this macro. For my debugging as of now I ended up creating a file in include/trace/events/buffer_debug.h and added the definition of BUFFER_TRACE macro there. On more googling I did find some old patch which enabled CONFIG_BUFFER_DEBUG. http://people.redhat.com/sct/patches/ext3-2.4/for-2.4.19/98-debug/00-ext3-debug.patch But this seemed pretty old and I could not find anything latest on this which is related to above patch. Any pointers pls? -ritesh
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