Le 27/11/2021 à 03:04, Vladimir Oltean a écrit :
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
Thanks for you patch.
However, it should already be fixed in 5.16-rc2 with the following commit : https://github.com/torvalds/linux/commit/5b54860943dc4681be5de2fc287408c7ce2...
Christophe
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);@@ -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