6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jiaxun Yang jiaxun.yang@flygoat.com
commit 8f7aa77a463f47c9e00592d02747a9fcf2271543 upstream.
vgabios is passed from firmware to kernel on Loongson64 systems. Sane firmware will keep this pointer in reserved memory space passed from the firmware but insane firmware keeps it in low memory before kernel entry that is not reserved.
Previously kernel won't try to allocate memory from low memory before kernel entry on boot, but after converting to memblock it will do that.
Fix by resversing those memory on early boot.
Cc: stable@vger.kernel.org Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") Signed-off-by: Jiaxun Yang jiaxun.yang@flygoat.com Signed-off-by: Thomas Bogendoerfer tsbogend@alpha.franken.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/mips/loongson64/init.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/arch/mips/loongson64/init.c +++ b/arch/mips/loongson64/init.c @@ -88,6 +88,11 @@ void __init szmem(unsigned int node) break; } } + + /* Reserve vgabios if it comes from firmware */ + if (loongson_sysconf.vgabios_addr) + memblock_reserve(virt_to_phys((void *)loongson_sysconf.vgabios_addr), + SZ_256K); }
#ifndef CONFIG_NUMA