From: Andreas Larsson andreas@gaisler.com
[ Upstream commit bda166930c37604ffa93f2425426af6921ec575a ]
Commit cca079ef8ac29a7c02192d2bad2ffe4c0c5ffdd0 changed sparc32 to use memblocks instead of bootmem, but also made high memory available via memblock allocation which does not work together with e.g. phys_to_virt and can lead to kernel panic.
This changes back to only low memory being allocatable in the early stages, now using memblock allocation.
Signed-off-by: Andreas Larsson andreas@gaisler.com Acked-by: Mike Rapoport rppt@linux.ibm.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- arch/sparc/mm/init_32.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c index 92634d4e440c..89a9244f2cf0 100644 --- a/arch/sparc/mm/init_32.c +++ b/arch/sparc/mm/init_32.c @@ -199,6 +199,9 @@ unsigned long __init bootmem_init(unsigned long *pages_avail) size = memblock_phys_mem_size() - memblock_reserved_size(); *pages_avail = (size >> PAGE_SHIFT) - high_pages;
+ /* Only allow low memory to be allocated via memblock allocation */ + memblock_set_current_limit(max_low_pfn << PAGE_SHIFT); + return max_pfn; }