From: Vladimir Oltean <vladimir.oltean@nxp.com>
To: Michael Ellerman <mpe@ellerman.id.au>, linuxppc-dev@lists.ozlabs.org
Cc: stable@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH] powerpc/mm: fix early initialization failure for MMUs with no hash table
Date: Sat, 27 Nov 2021 04:04:48 +0200 [thread overview]
Message-ID: <20211127020448.4008507-1-vladimir.oltean@nxp.com> (raw)
The blamed patch attempted to do a trivial conversion of
map_mem_in_cams() by adding an extra "bool init" argument, but by
mistake, changed the way in which two call sites pass the other boolean
argument, "bool dry_run".
As a result, early_init_this_mmu() now calls map_mem_in_cams() with
dry_run=true, and setup_initial_memory_limit() calls with dry_run=false,
both of which are unintended changes.
This makes the kernel boot process hang here:
[ 0.045211] e500 family performance monitor hardware support registered
[ 0.051891] rcu: Hierarchical SRCU implementation.
[ 0.057791] smp: Bringing up secondary CPUs ...
Issue noticed on a Freescale T1040.
Fixes: 52bda69ae8b5 ("powerpc/fsl_booke: Tell map_mem_in_cams() if init is done")
Cc: stable@vger.kernel.org
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
arch/powerpc/mm/nohash/tlb.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/mm/nohash/tlb.c b/arch/powerpc/mm/nohash/tlb.c
index 89353d4f5604..647bf454a0fa 100644
--- a/arch/powerpc/mm/nohash/tlb.c
+++ b/arch/powerpc/mm/nohash/tlb.c
@@ -645,7 +645,7 @@ static void early_init_this_mmu(void)
if (map)
linear_map_top = map_mem_in_cams(linear_map_top,
- num_cams, true, true);
+ num_cams, false, true);
}
#endif
@@ -766,7 +766,7 @@ void setup_initial_memory_limit(phys_addr_t first_memblock_base,
num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
linear_sz = map_mem_in_cams(first_memblock_size, num_cams,
- false, true);
+ true, true);
ppc64_rma_size = min_t(u64, linear_sz, 0x40000000);
} else
--
2.25.1
next reply other threads:[~2021-11-27 2:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-27 2:04 Vladimir Oltean [this message]
2021-11-27 12:00 ` [PATCH] powerpc/mm: fix early initialization failure for MMUs with no hash table Christophe Leroy
2021-11-27 15:48 ` Vladimir Oltean
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