From mboxrd@z Thu Jan 1 00:00:00 1970 From: vladimir.murzin@arm.com (Vladimir Murzin) Date: Tue, 5 Dec 2017 09:53:34 +0000 Subject: [PATCH] ARM: Disable CONFIG_DEBUG_VIRTUAL for NOMMU Message-ID: <1512467614-38194-1-git-send-email-vladimir.murzin@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- KernelVersion: 4.15-rc1 arch/arm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 18c1e7d..6cd616b 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -4,7 +4,7 @@ config ARM 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 -- 2.0.0