From: Tiwei Bie tiwei.btw@antgroup.com
[ Upstream commit e82cf3051e6193f61e03898f8dba035199064d36 ]
When uml_reserved is updated, min_low_pfn must also be updated accordingly. Otherwise, min_low_pfn will not accurately reflect the lowest available PFN.
Signed-off-by: Tiwei Bie tiwei.btw@antgroup.com Link: https://patch.msgid.link/20250221041855.1156109-1-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/um/kernel/mem.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index a5b4fe2ad9315..6ca9ea4a230bc 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -70,6 +70,7 @@ void __init mem_init(void) map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0); memblock_free((void *)brk_end, uml_reserved - brk_end); uml_reserved = brk_end; + min_low_pfn = PFN_UP(__pa(uml_reserved));
/* this will put all low memory onto the freelists */ memblock_free_all();