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    SubjectRe: linux-next: sparc tree build warning
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    From: Stephen Rothwell <sfr@canb.auug.org.au>
    Date: Fri, 29 Jan 2010 10:25:43 +1100

    > Hi Dave,
    >
    > On Thu, 28 Jan 2010 05:24:32 -0800 (PST) David Miller <davem@davemloft.net> wrote:
    >>
    >> From: Stephen Rothwell <sfr@canb.auug.org.au>
    >> Date: Thu, 28 Jan 2010 18:44:23 +1100
    >>
    >> > I am still seeing these. Is it my compiler version (gcc4.4.0)?
    >>
    >> You can't turn on DEBUG_STRICT_USER_COPY_CHECKS and
    >> expect a successful build. It's for developers to
    >> look at the errors that are generated and audit those
    >> cases in detail.
    >
    > These are defconfig builds and CONFIG_DEBUG_STRICT_USER_COPY_CHECKS is
    > not set in either case.

    Simply ignore the warning then, I thought you were reporting
    a build failure.

    > I only do an i386 defconfig build and I don't get these warnings.

    Looking at the specific case of net/core/pktgen.c:867

    "len" is variable in the net/core/pktgen.c line that emits the
    warning

    Even though it is limited to "sizeof(name) - 1" via strn_len()'s
    third argument, that's a lot to expect the compiler to dig into
    and be able to conclude invariants from.

    Please just ignore the warnings.

    Thanks.




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