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authorChris Metcalf <cmetcalf@tilera.com>2011-02-28 15:01:53 -0500
committerChris Metcalf <cmetcalf@tilera.com>2011-03-01 16:20:29 -0500
commit401586e9164d225d24bb9d3ddfeb03ef2e931ee3 (patch)
tree803b962adb1688da4c6220fec2681e0b66ea1638
parent9ff27fdbd5d1ffbe2e0a277b4b7bfd0eb8a4bb1c (diff)
downloadop-kernel-dev-401586e9164d225d24bb9d3ddfeb03ef2e931ee3.zip
op-kernel-dev-401586e9164d225d24bb9d3ddfeb03ef2e931ee3.tar.gz
arch/tile: avoid a simulator warning during bootup
As the added comment says, we can sometimes see a coherence warning from our simulator if the "swapper_pgprot" variable on the boot cpu has not been evicted from cache by the time the other cpus come up. Force it to be evicted so we never see the warning. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
-rw-r--r--arch/tile/mm/init.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
index e34597e..9a62479 100644
--- a/arch/tile/mm/init.c
+++ b/arch/tile/mm/init.c
@@ -653,6 +653,17 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
memcpy(pgd_base, pgtables, sizeof(pgtables));
__install_page_table(pgd_base, __get_cpu_var(current_asid),
swapper_pgprot);
+
+ /*
+ * We just read swapper_pgprot and thus brought it into the cache,
+ * with its new home & caching mode. When we start the other CPUs,
+ * they're going to reference swapper_pgprot via their initial fake
+ * VA-is-PA mappings, which cache everything locally. At that
+ * time, if it's in our cache with a conflicting home, the
+ * simulator's coherence checker will complain. So, flush it out
+ * of our cache; we're not going to ever use it again anyway.
+ */
+ __insn_finv(&swapper_pgprot);
}
/*
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