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    SubjectRe: [PATCH] ppc64: Fix PER_LINUX32 behaviour
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    From: Paul Mackerras <paulus@samba.org>
    Date: Thu, 9 Jun 2005 09:12:16 +1000

    > There is still a point of difference between ppc64 and x86_64: on
    > ppc64 (and on sparc64), if the personality is PER_LINUX32, the
    > personality(0xffffffffUL) system call returns PER_LINUX, and attempts
    > to set the personality to PER_LINUX don't change the personality
    > (i.e. it stays set to PER_LINUX32), for both 32-bit and 64-bit
    > processes. On x86_64 this is true for 32-bit processes but not for
    > 64-bit processes AFAICT. Does anyone know why we do this at all, and
    > whether doing it for 64-bit processes makes sense?

    We do this because, at least when this code was written,
    glibc would do a personality(PER_LINUX) call (either via
    the dynamic linker or via some other libc startup code)
    and this would undo the PER_LINUX32 setting.

    Therefore, it makes sense to do this for all cases, not
    just for 32-bit processes. The x86_64 code ought to be
    fixed, I think.
    -
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