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    SubjectRe: [PATCH 2/5] ftrace: use code patching for ftrace graph tracer
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    On Wed, 2008-11-26 at 00:35 -0800, Andrew Morton wrote:
    > On Wed, 26 Nov 2008 00:27:04 -0800 Harvey Harrison <harvey.harrison@gmail.com> wrote:
    >
    > > if (code[0] != 0xe9 || old_offset != load32_noalign(&code[1]))
    > >
    > > This is similar to the new API in -mm load_le32_noalign, but I
    > > don't think it would be worth load_u32_noalign...load32 should
    > > be enough.
    > >
    > > > > > > + return -EINVAL;
    > > > > > > +
    > > > > > > + *(int *)(&code[1]) = new_offset;
    > > > > >
    > > > > > Might be able to use put_unaligned_foo() here.
    > > > > >
    > > > >
    > > > > put_unaligned(new_offset, (int *)(&code[1]));
    > > > >
    > >
    > > In a similar vein to above, this becomes:
    > >
    > > store32_noalign(&code[1], new_offset);
    > >
    >
    > yes, that's much better than the party tricks with magical sizeof,
    > which forces you to run around and check the types of everything.
    >
    > I've seen people doing get_user() on `long' types and such things
    > occasionally.
    >

    Do you want to carry the patches to move to the new helpers until they
    hit mainline, or would you rather I waited until they can go through
    maintainer trees?

    I've got the pile ready removing all of the get/put_{endian} and moving
    to the load/store API. Not much left after that to just remove the
    magical sizeof versions too. Just let me know what timing you'd prefer.

    Also, all of this ends up being so intertwined in the aligned/unaligned
    cases that I'd like to move most of Documentation/unaligned_memory_access.txt
    into a new alignment_and_byteorder.txt to cover all of these new helpers.

    I started most of a byteorder document, but constantly referring to the other
    file made it a bit tiresome, would you mind a consolidated document?

    Harvey



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