diff options
| author | Magnus Damm <damm@opensource.se> | 2013-10-22 18:59:54 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-10-29 12:06:30 +0100 |
| commit | 6d7d5da7d75c6df676c8b72d32b02ff024438f0c (patch) | |
| tree | f527a2fd59de0da7fdbc6a13b2e697de99581792 /arch/arm/kernel/setup.c | |
| parent | ARM: 7863/1: Let arm_add_memory() always use 64-bit arguments (diff) | |
| download | linux-6d7d5da7d75c6df676c8b72d32b02ff024438f0c.tar.xz linux-6d7d5da7d75c6df676c8b72d32b02ff024438f0c.zip | |
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 <damm@opensource.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/setup.c')
| -rw-r--r-- | arch/arm/kernel/setup.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 5ec4443af08b..53c3901f7ee3 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); /* |