RE: Fix asm constraint in put_user

>> You could use the "S" constraint here.  This isn't used anywhere in
>> gcc.  This exists solely for use by asms that need a non-postinc MEM.
>
>Alas, it does not work:

So should I go with the original patch using "r"?  I agree with Andreas'
assessment that it doesn't matter that we didn't tell gcc that memory
was being changed, since the memory that gets changed isn't in a space
that gcc knows about.

Or are there any more letters of the alphabet to try :-)

-Tony
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