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    SubjectRE: [PATCH] phy: fix compiler array bounds warning on settings[]
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    From: Bjorn Helgaas
    > On Wed, Mar 5, 2014 at 2:10 AM, David Laight <David.Laight@aculab.com> wrote:
    > > From: Bjorn Helgaas
    > >> With -Werror=array-bounds, gcc v4.7.x warns that in phy_find_valid(), the
    > >> settings[] "array subscript is above array bounds", I think because idx is
    > >> a signed integer and if the caller supplied idx < 0, we pass the guard but
    > >> still reference out of bounds.
    > >
    > > Not rejecting the patch but...
    > >
    > > Just indexing an array with 'int' shouldn't cause this warning,
    > > so somewhere a caller must actually be passing an idx < 0.
    > >
    > > While changing the type to unsigned will make the comparison
    > > against the array bound reject the -1, I suspect that the
    > > specific call path didn't really intend passing a hard-coded -1.
    > >
    > > It might be worth trying to locate the call site that passes -1.
    >
    > I agree 100%. If that's the case, we definitely should find that
    > caller rather than apply this patch. I'll look more today.

    You might want to apply the patch as well :-)

    David

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