From: vladimir.murzin@arm.com (Vladimir Murzin)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: Disable CONFIG_DEBUG_VIRTUAL for NOMMU
Date: Mon, 11 Dec 2017 10:27:08 +0000 [thread overview]
Message-ID: <abbfc5a0-2852-48a9-1d11-160a1a429088@arm.com> (raw)
In-Reply-To: <1512467614-38194-1-git-send-email-vladimir.murzin@arm.com>
On 05/12/17 09:53, Vladimir Murzin wrote:
> 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>
> ---
> 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
>
Ok for patch tracker?
Vladimir
prev parent reply other threads:[~2017-12-11 10:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-05 9:53 [PATCH] ARM: Disable CONFIG_DEBUG_VIRTUAL for NOMMU Vladimir Murzin
2017-12-11 10:27 ` Vladimir Murzin [this message]
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