From 401586e9164d225d24bb9d3ddfeb03ef2e931ee3 Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Mon, 28 Feb 2011 15:01:53 -0500 Subject: [PATCH] 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 --- arch/tile/mm/init.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c index e34597e512df..9a62479aafb4 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); } /* -- 2.39.5