This was a lot more trivial than I expected, about a 20 minute
hack.  Most of the time was spent on test boots :)

The first patch removes the packed attribute from the ftrace_page
blob of dynamic ftrace entries, because not only does it cause
unaligned accesses on sparc64 it's also totally useless.

The second patch adds sparc64 ftrace support.

One thing I noticed is that sparc64 uses an mcount implementation
already for a quick-and-dirty stack usage checker.  I tried to
make them live alongside eachother.

Next, I think the mcount symbol export needs some tweaking.  On sparc,
the symbol _mcount is what the compiler references (this seems to be a
sparc sysv4'ism) whereas on x86 it appears that plain "mcount" is
used.  I provide both symbols and we already have a local export of
"_mcount" to take care of this.  I think architectures should deal
with this symbol exporting since it is different on every system.

Signed-off-by: David S. Miller <davem@davemloft.net>
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原文链接: http://lkml.org/lkml/2008/5/14/23