i386: Add warning in Documentation that zero-page is not a stable ABI
Some people writing boot loaders seem to falsely belief the 32bit zero page is a stable interface for out of tree code like the real mode boot protocol. Add a comment clarifying that is not true. Signed-off-by: NAndi Kleen <ak@suse.de> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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