Merge patch series "kexec: keep the next kernel off hardware-poisoned pages"

Breno Leitao <leitao@debian.org> says:

Memory failures are common enough on large fleets that kexec regularly
lands the next kernel on a frame the memory failure subsystem has already
marked bad. Patch 2 teaches the segment placement to avoid those frames.

Patch 1 is a prerequisite. locate_mem_hole_top_down() walks candidates
downwards without ever checking that the subtraction stays above zero, so
the walk can wrap and report success with a destination outside of RAM.
Patch 2 adds one more downward step to that loop, so the bug is fixed
first and both patches rely on the same bail-out.

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