p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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>
This commit is contained in:
Magnus Damm 2013-10-22 17:59:54 +01:00 committed by Russell King
parent 6a5014aa03
commit 6d7d5da7d7
1 changed files with 12 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/arm/kernel/setup.c
View File

@ -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);
/*