On 64-bit powerpc, usage of a non-16MB-aligned value for the mem= kernel cmdline parameter results in a system hang at boot.
For example, using 'mem=4198400K' will always reproduce this issue. This patch fixes the problem by aligning any argument to mem= to 16MB corresponding with the large page size on powerpc. Fixes: 2babf5c2ec2f ("[PATCH] powerpc: Unify mem= handling") Co-developed-by: Gonzalo Siero <gsier...@redhat.com> Signed-off-by: Gonzalo Siero <gsier...@redhat.com> Signed-off-by: Joel Savitz <jsav...@redhat.com> --- arch/powerpc/kernel/prom.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 0b5878c3125b..8cd3e2445d8a 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -82,8 +82,12 @@ static int __init early_parse_mem(char *p) { if (!p) return 1; - +#ifdef CONFIG_PPC64 + /* Align to 16 MB == size of ppc64 large page */ + memory_limit = ALIGN(memparse(p, &p), 0x1000000); +#else memory_limit = PAGE_ALIGN(memparse(p, &p)); +#endif DBG("memory limit = 0x%llx\n", memory_limit); return 0; -- 2.43.0