| Message ID | 1407121088-4151-10-git-send-email-haojian.zhuang@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Aug 04, 2014 at 10:58:08AM +0800, Haojian Zhuang wrote: > early_init_dt_add_memory_arch() accepts base & size parameters as u64 > type. memblock_add() accepts base & size parameters as phys_addr_t type. > But phys_addr_t isn't equal to u64. In 32-bit system, phys_addr_t is > 32-bit long. If 64-bit memory address is specified in DTS file, it'll be > truncated into 32-bit address. > > So create two values to store base & size first as phys_addr_t type. > Then compare them with u64 base & u64 size. If they don't match, discard > them. > > Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org> > --- > drivers/of/fdt.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c > index c4cddf0..10d5382 100644 > --- a/drivers/of/fdt.c > +++ b/drivers/of/fdt.c > @@ -878,6 +878,8 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, > void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) > { > const u64 phys_offset = __pa(PAGE_OFFSET); > + phys_addr_t mbase, msize; > + > base &= PAGE_MASK; > size &= PAGE_MASK; > if (base + size < phys_offset) { > @@ -885,6 +887,14 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) > base, base + size); > return; > } > + /* phys_addr_t may not be equal to u64 */ > + mbase = base; > + msize = size; > + if ((mbase != base) || (msize != size)) { > + pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", > + base, base + size); > + return; Actually, you can do better than this -- you can still use the part that fits in 32 bits even if not all of it does. -Olof
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index c4cddf0..10d5382 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -878,6 +878,8 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) { const u64 phys_offset = __pa(PAGE_OFFSET); + phys_addr_t mbase, msize; + base &= PAGE_MASK; size &= PAGE_MASK; if (base + size < phys_offset) { @@ -885,6 +887,14 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) base, base + size); return; } + /* phys_addr_t may not be equal to u64 */ + mbase = base; + msize = size; + if ((mbase != base) || (msize != size)) { + pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", + base, base + size); + return; + } if (base < phys_offset) { pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", base, phys_offset);
early_init_dt_add_memory_arch() accepts base & size parameters as u64 type. memblock_add() accepts base & size parameters as phys_addr_t type. But phys_addr_t isn't equal to u64. In 32-bit system, phys_addr_t is 32-bit long. If 64-bit memory address is specified in DTS file, it'll be truncated into 32-bit address. So create two values to store base & size first as phys_addr_t type. Then compare them with u64 base & u64 size. If they don't match, discard them. Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org> --- drivers/of/fdt.c | 10 ++++++++++ 1 file changed, 10 insertions(+)