On Tue, Jan 23, 2024 at 05:54:17PM +0000, Dave Martin wrote: > I still feel that it is iffy practice for userspace to rely on the > extra bits being zeroed -- I think the architecture hides this > guarantee anyway whenever you go through a function call confirming to > the regular procedure call standard (including the syscall wrappers). > But there may not be a lot of point trying to put people off if we > can't force them not to rely on it. I do tend to agree that the requirement to zero is excessively zealous and that the risk from relaxing it is minor (it's stricter than the function call ABI), I did leave a sysctl as a mechanism for restoring compatibility in the case where we did run into issues in my original series but I didn't expect to need it. If you convince everyone else I'd be happy to relax things but I don't super care either way.
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