ARM: fix overflow of vmalloc_limit in sanity_check_meminfo
PATCH 1/1 ARM: fix overflow of vmalloc_limit in sanity_check_meminfo
vmalloc_limit easily overflows if CONFIG_VMSPLIT_1G=y and CONFIG_ARM_LPAE=n, in this case whole memory turns into "highmem" and system cannot boot. For example if PHYS_OFFSET=0x80000000 and PAGE_OFFSET=0x40000000 then vmalloc_limit should be 0x1_2F800000, but value does not fit into variable.
Signed-off-by Konstantin Khlebnikov <[email protected]>
--- arch/arm/mm/mmu.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
arch/arm/mm/mmu.c +5 -1
@@ -1075,10 +1075,14 @@ phys_addr_t arm_lowmem_limit __initdata = 0;void __init sanity_check_meminfo (void ) {phys_addr_t memblock_limit =0 ; +phys_addr_t vmalloc_limit =-1 ;int highmem =0 ; -phys_addr_t vmalloc_limit =__pa (vmalloc_min -1 ) +1 ;struct memblock_region *reg; +if ((unsigned long )vmalloc_min -PAGE_OFFSET < + vmalloc_limit -PHYS_OFFSET ) + vmalloc_limit =__pa (vmalloc_min -1 ) +1 ; +for_each_memblock (memory, reg) {phys_addr_t block_start = reg->base;phys_addr_t block_end = reg->base + reg->size;