While running MPS2 platform (NOMMU) with DTB placed below PHYS_OFFSET
following warning poped up:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at arch/arm/mm/physaddr.c:42 __virt_to_phys+0x2f/0x40
virt_to_phys used for non-linear address:
00004000 (0x4000)
CPU: 0 PID: 0 Comm: swapper Not tainted 4.15.0-rc1-
5a31bf2-clean+ #2767
Hardware name: MPS2 (Device Tree Support)
[<
2100bf39>] (unwind_backtrace) from [<
2100b3ff>] (show_stack+0xb/0xc)
[<
2100b3ff>] (show_stack) from [<
2100e697>] (__warn+0x87/0xac)
[<
2100e697>] (__warn) from [<
2100e6db>] (warn_slowpath_fmt+0x1f/0x28)
[<
2100e6db>] (warn_slowpath_fmt) from [<
2100c603>] (__virt_to_phys+0x2f/0x40)
[<
2100c603>] (__virt_to_phys) from [<
2116a499>] (early_init_fdt_reserve_self+0xd/0x24)
[<
2116a499>] (early_init_fdt_reserve_self) from [<
2116222d>] (arm_memblock_init+0xb5/0xf8)
[<
2116222d>] (arm_memblock_init) from [<
21161cad>] (setup_arch+0x38b/0x50e)
[<
21161cad>] (setup_arch) from [<
21160455>] (start_kernel+0x31/0x280)
[<
21160455>] (start_kernel) from [<
00000000>] ( (null))
random: get_random_bytes called from init_oops_id+0x17/0x2c with crng_init=0
---[ end trace
0000000000000000 ]---
Platforms without MMU support run with 1:1 (i.e. linear) memory
mapping, so disable CONFIG_DEBUG_VIRTUAL.
Fixes: e377cd8221eb ("ARM: 8640/1: Add support for CONFIG_DEBUG_VIRTUAL")
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
default y
select ARCH_CLOCKSOURCE_DATA
select ARCH_DISCARD_MEMBLOCK if !HAVE_ARCH_PFN_VALID
- select ARCH_HAS_DEBUG_VIRTUAL
+ select ARCH_HAS_DEBUG_VIRTUAL if MMU
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_SET_MEMORY