Commit 6d7d5da7 authored by Magnus Damm's avatar Magnus Damm Committed by Russell King
Browse files

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: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 6a5014aa

arch/arm/kernel/setup.c

+12 −4
Original line number Diff line number Diff line
@@ -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);



	/*

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