On 9/26/23 20:10, Huacai Chen wrote:
high_memory is the virtual address of the 'highest physical address' in
the system. But __va(get_num_physpages() << PAGE_SHIFT) is not what we
want because there may be holes in the physical address space. On the
other hand, max_low_pfn is calculated from memblock_end_of_DRAM(), which
is exactly corresponding to the highest physical address, so use it for
high_memory calculation.
Cc: <stable@xxxxxxxxxxxxxxx>
Which commit is this patch intended to amend? A "Fixes:" tag may be
helpful for stable backporting.
Signed-off-by: Chong Qiao <qiaochong@xxxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
---
arch/loongarch/kernel/numa.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c
index c7d33c489e04..6e65ff12d5c7 100644
--- a/arch/loongarch/kernel/numa.c
+++ b/arch/loongarch/kernel/numa.c
@@ -436,7 +436,7 @@ void __init paging_init(void)
void __init mem_init(void)
{
- high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
+ high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
memblock_free_all();
}
--
WANG "xen0n" Xuerui
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