Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

From: H. Peter Anvin
Date: Tue May 20 2008 - 14:02:00 EST

Mikael Pettersson wrote:

An ugly workaround could be to start clearing one of these fields,
and say that the data there is only valid for kernels >= 2.6.26.
(I said it was ugly...)

Or we go back to stashing a flag in uc_flags (which is kosher),
and try to figure out how to mark non-rt sigframes.

Or use the OSXSAVE hack. Let me think about this for some time.

There is also the option of simply using a field guarded by a 64- or 128-bit magic number. It's a bit ugly, but it works.

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