[PATCH 4.9 1/8] ARM: 8904/1: skip nomap memblocks while finding the lowmem/highmem boundary

Lee Jones
2019-11-22T11:14:43Z

From: Chester Lin <clin@suse.com>

[ Upstream commit 1d31999cf04c21709f72ceb17e65b54a401330da ]

adjust_lowmem_bounds() checks every memblocks in order to find the boundary
between lowmem and highmem. However some memblocks could be marked as NOMAP
so they are not used by kernel, which should be skipped while calculating
the boundary.

Signed-off-by: Chester Lin <clin@suse.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
arch/arm/mm/mmu.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 241bf898adf5..7edc6c3f4bd9 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1188,6 +1188,9 @@ void __init adjust_lowmem_bounds(void)
phys_addr_t block_start = reg->base;
phys_addr_t block_end = reg->base + reg->size;

+ if (memblock_is_nomap(reg))
+ continue;
+
if (reg->base < vmalloc_limit) {
if (block_end > lowmem_limit)
/*
--
2.24.0