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H A Dbase.c8f5abe84 Mon Nov 27 18:45:56 CST 2017 Linus Torvalds <torvalds@linux-foundation.org> proc: don't report kernel addresses in /proc/<pid>/stack

This just changes the file to report them as zero, although maybe even
that could be removed. I checked, and at least procps doesn't actually
seem to parse the 'stack' file at all.

And since the file doesn't necessarily even exist (it requires
CONFIG_STACKTRACE), possibly other tools don't really use it either.

That said, in case somebody parses it with tools, just having that zero
there should keep such tools happy.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>