This is a note to let you know that I've just added the patch titled
sparc32: Limit memblock allocation to low memory
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sparc32-limit-memblock-allocation-to-low-memory.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 41eb0a85d01ef907a3908c0f944d432c8719c003
Author: Andreas Larsson <andreas@xxxxxxxxxxx>
Date: Fri Feb 5 14:20:31 2021 +0100
sparc32: Limit memblock allocation to low memory
[ 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@xxxxxxxxxxx>
Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
}
