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Subject[patch 0/17] Series to introduce WARN()... a WARN_ON() variant that takes printk arguments

This patch series introduces WARN(), which is a WARN_ON() variant that
takes printk() like arguments. This was done after both akpm and I hit
several cases where this would have been useful; in addition, with
WARN(), we put the printk string inside the -----[ cut here ]-----
section, making it more likely that users (and tools like kerneloops)
pick up the message in addition to just the bare WARNING.

The first few patches have been in -mm for a long time; the later ones
are newer and introduce more users of WARN().

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