Messages in this thread | | | Subject | Re: [PATCH] ppc64: Fix PER_LINUX32 behaviour | From | Andi Kleen <> | Date | Sat, 11 Jun 2005 13:24:50 +0200 |
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"David S. Miller" <davem@davemloft.net> writes:
> 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? 5A> > 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.
I have never seen a report of such a case (glibc undoing linux32). Do you have details?
But I agree 64bit should be consistent to 32bit. Will fix.
-Andi
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