--- Jim Bauer <jfbauer@nfr.com> wrote:
> >
> > I am not sure I understand that. What do you mean by
> > 'gdb saw new ones'? How exactly did you check that in
> > gdb?
>
> I added some code the to kernel module to scribble
> a pattern over the old buffer when I switch to the new
> one.
> I was filling each byte with the value 0x62.
>
> The user-space test program had something like...
>
> if (data->len > 2000)
> printf("length (0x%x) is too big\n", data->len);
>
> and it prints out 0x62626262 for the length (old buffer
> contents).
> But if I use gdb to print out data->len, at that point, I
> get a reasonable/expected value.
Is it possible that the value of data->len is in a
register?
If so, the program may not re-read the actual value before
printing. I think a better test is to dump the contents of
the full buffer.
-Ravi.
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