mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 20:01:55 +00:00
a849088aa1
Murali Nalajala reports a regression that ioremapping address zero
results in an oops dump:
Unable to handle kernel paging request at virtual address fa200000
pgd = d4f80000
[fa200000] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 Tainted: G W (3.4.0-g3b5f728-00009-g638207a #13)
PC is at msm_pm_config_rst_vector_before_pc+0x8/0x30
LR is at msm_pm_boot_config_before_pc+0x18/0x20
pc : [<c0078f84>] lr : [<c007903c>] psr: a0000093
sp : c0837ef0 ip : cfe00000 fp : 0000000d
r10: da7efc17 r9 : 225c4278 r8 : 00000006
r7 : 0003c000 r6 : c085c824 r5 : 00000001 r4 : fa101000
r3 : fa200000 r2 : c095080c r1 : 002250fc r0 : 00000000
Flags: NzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: 10c5387d Table: 25180059 DAC: 00000015
[<c0078f84>] (msm_pm_config_rst_vector_before_pc+0x8/0x30) from [<c007903c>] (msm_pm_boot_config_before_pc+0x18/0x20)
[<c007903c>] (msm_pm_boot_config_before_pc+0x18/0x20) from [<c007a55c>] (msm_pm_power_collapse+0x410/0xb04)
[<c007a55c>] (msm_pm_power_collapse+0x410/0xb04) from [<c007b17c>] (arch_idle+0x294/0x3e0)
[<c007b17c>] (arch_idle+0x294/0x3e0) from [<c000eed8>] (default_idle+0x18/0x2c)
[<c000eed8>] (default_idle+0x18/0x2c) from [<c000f254>] (cpu_idle+0x90/0xe4)
[<c000f254>] (cpu_idle+0x90/0xe4) from [<c057231c>] (rest_init+0x88/0xa0)
[<c057231c>] (rest_init+0x88/0xa0) from [<c07ff890>] (start_kernel+0x3a8/0x40c)
Code: c0704256 e12fff1e e59f2020 e5923000 (e5930000)
This is caused by the 'reserved' entries which we insert (see
19b52abe3c - ARM: 7438/1: fill possible PMD empty section gaps)
which get matched for physical address zero.
Resolve this by marking these reserved entries with a different flag.
Cc: <stable@vger.kernel.org>
Tested-by: Murali Nalajala <mnalajal@codeaurora.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
#ifdef CONFIG_MMU
|
|
|
|
/* the upper-most page table pointer */
|
|
extern pmd_t *top_pmd;
|
|
|
|
/*
|
|
* 0xffff8000 to 0xffffffff is reserved for any ARM architecture
|
|
* specific hacks for copying pages efficiently, while 0xffff4000
|
|
* is reserved for VIPT aliasing flushing by generic code.
|
|
*
|
|
* Note that we don't allow VIPT aliasing caches with SMP.
|
|
*/
|
|
#define COPYPAGE_MINICACHE 0xffff8000
|
|
#define COPYPAGE_V6_FROM 0xffff8000
|
|
#define COPYPAGE_V6_TO 0xffffc000
|
|
/* PFN alias flushing, for VIPT caches */
|
|
#define FLUSH_ALIAS_START 0xffff4000
|
|
|
|
static inline void set_top_pte(unsigned long va, pte_t pte)
|
|
{
|
|
pte_t *ptep = pte_offset_kernel(top_pmd, va);
|
|
set_pte_ext(ptep, pte, 0);
|
|
local_flush_tlb_kernel_page(va);
|
|
}
|
|
|
|
static inline pte_t get_top_pte(unsigned long va)
|
|
{
|
|
pte_t *ptep = pte_offset_kernel(top_pmd, va);
|
|
return *ptep;
|
|
}
|
|
|
|
static inline pmd_t *pmd_off_k(unsigned long virt)
|
|
{
|
|
return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
|
|
}
|
|
|
|
struct mem_type {
|
|
pteval_t prot_pte;
|
|
pmdval_t prot_l1;
|
|
pmdval_t prot_sect;
|
|
unsigned int domain;
|
|
};
|
|
|
|
const struct mem_type *get_mem_type(unsigned int type);
|
|
|
|
extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
|
|
|
|
/*
|
|
* ARM specific vm_struct->flags bits.
|
|
*/
|
|
|
|
/* (super)section-mapped I/O regions used by ioremap()/iounmap() */
|
|
#define VM_ARM_SECTION_MAPPING 0x80000000
|
|
|
|
/* permanent static mappings from iotable_init() */
|
|
#define VM_ARM_STATIC_MAPPING 0x40000000
|
|
|
|
/* empty mapping */
|
|
#define VM_ARM_EMPTY_MAPPING 0x20000000
|
|
|
|
/* mapping type (attributes) for permanent static mappings */
|
|
#define VM_ARM_MTYPE(mt) ((mt) << 20)
|
|
#define VM_ARM_MTYPE_MASK (0x1f << 20)
|
|
|
|
/* consistent regions used by dma_alloc_attrs() */
|
|
#define VM_ARM_DMA_CONSISTENT 0x20000000
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_ZONE_DMA
|
|
extern phys_addr_t arm_dma_limit;
|
|
#else
|
|
#define arm_dma_limit ((phys_addr_t)~0)
|
|
#endif
|
|
|
|
extern phys_addr_t arm_lowmem_limit;
|
|
|
|
void __init bootmem_init(void);
|
|
void arm_mm_memblock_reserve(void);
|
|
void dma_contiguous_remap(void);
|