From: Magnus Damm Date: Tue, 22 Oct 2013 16:59:54 +0000 (+0100) Subject: ARM: 7864/1: Handle 64-bit memory in case of 32-bit phys_addr_t X-Git-Tag: v3.13-rc1~103^2~2^2~10 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6d7d5da7d75c6df676c8b72d32b02ff024438f0c;p=platform%2Fkernel%2Flinux-exynos.git ARM: 7864/1: Handle 64-bit memory in case of 32-bit phys_addr_t Use CONFIG_ARCH_PHYS_ADDR_T_64BIT to determine if ignoring or truncating of memory banks is neccessary. This may be needed in the case of 64-bit memory bank addresses but when phys_addr_t is kept 32-bit. Signed-off-by: Magnus Damm Signed-off-by: Russell King --- diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 5ec4443a..53c3901 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -624,6 +624,7 @@ void __init dump_machine_table(void) int __init arm_add_memory(u64 start, u64 size) { struct membank *bank = &meminfo.bank[meminfo.nr_banks]; + u64 aligned_start; if (meminfo.nr_banks >= NR_BANKS) { printk(KERN_CRIT "NR_BANKS too low, " @@ -636,10 +637,16 @@ int __init arm_add_memory(u64 start, u64 size) * Size is appropriately rounded down, start is rounded up. */ size -= start & ~PAGE_MASK; - bank->start = PAGE_ALIGN(start); + aligned_start = PAGE_ALIGN(start); -#ifndef CONFIG_ARM_LPAE - if (bank->start + size < bank->start) { +#ifndef CONFIG_ARCH_PHYS_ADDR_T_64BIT + if (aligned_start > ULONG_MAX) { + printk(KERN_CRIT "Ignoring memory at 0x%08llx outside " + "32-bit physical address space\n", (long long)start); + return -EINVAL; + } + + if (aligned_start + size > ULONG_MAX) { printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in " "32-bit physical address space\n", (long long)start); /* @@ -647,10 +654,11 @@ int __init arm_add_memory(u64 start, u64 size) * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB. * This means we lose a page after masking. */ - size = ULONG_MAX - bank->start; + size = ULONG_MAX - aligned_start; } #endif + bank->start = aligned_start; bank->size = size & ~(phys_addr_t)(PAGE_SIZE - 1); /*