Messages in this thread | | | Date | Tue, 18 Nov 2008 10:31:51 -0500 (EST) | From | Steven Rostedt <> | Subject | Re: [PATCH 1/1] ftrace: fix wrong pos computing when read buffer has been fulfilled. |
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On Tue, 18 Nov 2008, walimis wrote: > On Tue, Nov 18, 2008 at 09:36:07AM -0500, Steven Rostedt wrote: > >> > >> fix: > >> > >> Through checking return value of seq_printf, if less than 0, we know > >> this function doesn't be printed. Then we decrease position to force > >> this function to be printed next time, in next read buffer. > > > >A lot of the code for seq files I cut and paste from other places that I > >have written it. The seq files always confuse me, so I like to use stuff > >that worked before. Some of the things that walimis fixed were not needed > >for this file, and was overkill.
> It also confuse me a lot. I also checked all places using seq files in > trace/ftrace code, to see whether there are similar problem. > - trace.c: in s_start() it force pos to decrease one such as: > l = *pos - 1; > so it works well. > - trace_stack.c: t_start, in almost all cases, can be only called > once, so we don't see the error. But I wonder whether it still works > well if output message exceeds the size of seq file buffer and call > t_start twice. If needed, I can test it. > - trace_branch.c : the same with above. >
If you can find a bug, then by all means, fix it ;-)
Thanks,
-- Steve
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