From 602946ec2f90d5bd965857753880db29d2d9a1e9 Mon Sep 17 00:00:00 2001 From: Christophe Leroy <christophe.leroy@csgroup.eu> Date: Tue, 12 Oct 2021 12:40:37 +0200 Subject: [PATCH] powerpc: Set max_mapnr correctly max_mapnr is used by virt_addr_valid() to check if a linear address is valid. It must only include lowmem PFNs, like other architectures. Problem detected on a system with 1G mem (Only 768M are mapped), with CONFIG_DEBUG_VIRTUAL and CONFIG_TEST_DEBUG_VIRTUAL, it didn't report virt_to_phys(VMALLOC_START), VMALLOC_START being 0xf1000000. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/77d99037782ac4b3c3b0124fc4ae80ce7b760b05.1634035228.git.christophe.leroy@csgroup.eu --- arch/powerpc/mm/mem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 05b9c3f31456..bd5d91a31183 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -256,7 +256,7 @@ void __init mem_init(void) #endif high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); - set_max_mapnr(max_pfn); + set_max_mapnr(max_low_pfn); kasan_late_init(); -- 2.42.0