[PATCH] powerpc: Better pmd_bad() and pud_bad() checks
At present, the powerpc pmd_bad() and pud_bad() macros return false unless the given pmd or pud is zero. This patch makes these tests more thorough, checking if the given pmd or pud looks like a plausible pte page or pmd page pointer respectively. This can result in helpful error messages when messing with the pagetable code. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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