Replace __pa() with __pa_symbol() in debug_vm_pgtable() while accessing the physical address for 'start_kernel' which is a kernel text symbol, else it might trigger the following warning on some platforms when DEBUG_VIRTUAL is enabled. [ 23.123852] ------------[ cut here ]------------ [ 23.124486] virt_to_phys used for non-linear address: (____ptrval____) (start_kernel+0x0/0x424) [ 23.125663] WARNING: CPU: 11 PID: 1 at arch/arm64/mm/physaddr.c:15 __virt_to_phys+0x60/0x98 [ 23.126877] Modules linked in: [ 23.127390] CPU: 11 PID: 1 Comm: swapper/0 Tainted: G W 5.6.0-rc3-next-20200226-00001-g306225cc6ffd #163 [ 23.129139] Hardware name: linux,dummy-virt (DT) [ 23.129898] pstate: 60400005 (nZCv daif +PAN -UAO) [ 23.130693] pc : __virt_to_phys+0x60/0x98 [ 23.131359] lr : __virt_to_phys+0x60/0x98 [ 23.132022] sp : ffff800011e6be10 [ 23.132575] x29: ffff800011e6be10 x28: 0000000000000000 [ 23.133447] x27: 0000000000000000 x26: 0000000000000000 [ 23.134319] x25: 0000000000000000 x24: 0020000000000fd3 [ 23.135197] x23: fffffe000bd27700 x22: ffff0002fcae8000 [ 23.136069] x21: ffff800011a47000 x20: 0000000000000001 [ 23.136941] x19: ffff800011350a14 x18: 0000000000000010 [ 23.137815] x17: 000000006bb8910e x16: 00000000a1fdc699 [ 23.138693] x15: ffffffffffffffff x14: 6c656e72656b5f74 [ 23.139567] x13: 726174732820295f x12: 5f5f5f6c61767274 [ 23.140441] x11: 705f5f5f5f28203a x10: 7373657264646120 [ 23.141314] x9 : 7261656e696c2d6e x8 : ffff8000106b4e70 [ 23.142189] x7 : 00000000000002a1 x6 : ffff800011a58bba [ 23.143067] x5 : 001fffffffffffff x4 : 0000000000000000 [ 23.143939] x3 : 00000000ffffffff x2 : ffff800011881bf8 [ 23.144810] x1 : 16ee3f9cb03efc00 x0 : 0000000000000000 [ 23.145682] Call trace: [ 23.146097] __virt_to_phys+0x60/0x98 [ 23.146710] debug_vm_pgtable+0xd0/0x440 [ 23.147362] kernel_init+0x18/0x100 [ 23.147944] ret_from_fork+0x10/0x18 [ 23.148539] ---[ end trace fc4ccb3cb35ff225 ]--- Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: linux-kernel@xxxxxxxxxxxxxxx Reported-by: Qian Cai <cai@xxxxxx> Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> --- This applies on linux-next (next-20200226). Tested on arm64 and x86 platforms. Build tested on several others. mm/debug_vm_pgtable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index cdfab040c1f6..9d1c8570fa00 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -585,7 +585,7 @@ void __init debug_vm_pgtable(void) * helps avoid large memory block allocations to be used for mapping * at higher page table levels. */ - paddr = __pa(&start_kernel); + paddr = __pa_symbol(&start_kernel); pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT; pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT; -- 2.20.1
