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powerpc/cacheinfo: Warn if cache object chain becomes unordered

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This can catch cases where the device tree has gotten mishandled into
an inconsistent state at runtime, e.g. the cache nodes for both the
source and the destination are present after a migration.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190627051537.7298-5-nathanl@linux.ibm.com
This commit is contained in:
Nathan Lynch 2019-06-27 00:15:37 -05:00 committed by Michael Ellerman
parent 1b3da8ffaa
commit 6ec54363f1
1 changed files with 9 additions and 0 deletions
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9
arch/powerpc/kernel/cacheinfo.c
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@ -420,6 +420,15 @@ static void link_cache_lists(struct cache *smaller, struct cache *bigger)
}
smaller->next_local = bigger;
/*
* The cache->next_local list sorts by level ascending:
* L1d -> L1i -> L2 -> L3 ...
*/
WARN_ONCE((smaller->level == 1 && bigger->level > 2) ||
(smaller->level > 1 && bigger->level != smaller->level + 1),
"linking L%i cache %pOFP to L%i cache %pOFP; skipped a level?\n",
smaller->level, smaller->ofnode, bigger->level, bigger->ofnode);
}
static void do_subsidiary_caches_debugcheck(struct cache *cache)