hi Catalin:
> On Thu, Mar 14, 2019 at 11:20:47AM +0800, pierre Kuo wrote:
> > in the previous case, initrd_start and initrd_end can be successfully
> > returned either (base < memblock_start_of_DRAM()) or (base + size >
> > memblock_start_of_DRAM() + linear_region_size).
> >
> > That means even linear mapping range check fail for initrd_start and
> > initrd_end, it still can get virtual address. Here we put
> > initrd_start/initrd_end to be calculated only when linear mapping check
> > pass.
> >
> > Fixes: c756c592e442 ("arm64: Utilize phys_initrd_start/phys_initrd_size")
>
> For future versions, please also cc the author of the original commit
> you are fixing.
Got it and thanks for ur warm reminder ^^
> >
> > arch/arm64/mm/init.c | 8 +++-----
> > 1 file changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> > index 7205a9085b4d..1adf418de685 100644
> > --- a/arch/arm64/mm/init.c
> > +++ b/arch/arm64/mm/init.c
> > @@ -425,6 +425,9 @@ void __init arm64_memblock_init(void)
> > memblock_remove(base, size); /* clear MEMBLOCK_ flags
> > */
> > memblock_add(base, size);
> > memblock_reserve(base, size);
> > + /* the generic initrd code expects virtual addresses
> > */
> > + initrd_start = __phys_to_virt(phys_initrd_start);
> > + initrd_end = initrd_start + phys_initrd_size;
> > }
> > }
> >
> > @@ -450,11 +453,6 @@ void __init arm64_memblock_init(void)
> > * pagetables with memblock.
> > */
> > memblock_reserve(__pa_symbol(_text), _end - _text);
> > - if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {
> > - /* the generic initrd code expects virtual addresses */
> > - initrd_start = __phys_to_virt(phys_initrd_start);
> > - initrd_end = initrd_start + phys_initrd_size;
> > - }
>
> With CONFIG_RANDOMIZE_BASE we can get a further change to memstart_addr
> after the place where you moved the initrd_{start,end} setting, which
> would result in a different value for __phys_to_virt(phys_initrd_start).
I found what you mean, since __phys_to_virt will use PHYS_OFFSET
(memstart_addr) for calculating.
How about moving CONFIG_RANDOMIZE_BASE part of code ahead of
CONFIG_BLK_DEV_INITRD checking?
That means below (d) moving ahead of (c)
prvious:
if (memstart_addr + linear_region_size < memblock_end_of_DRAM()) {} ---(a)
if (memory_limit != PHYS_ADDR_MAX) {} ---(b)
if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {} ---(c)
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {} ---(d)
now:
if (memstart_addr + linear_region_size < memblock_end_of_DRAM()) { ---(a)
if (memory_limit != PHYS_ADDR_MAX) {} ----------------(b)
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {} --------------(d)
if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {} ---(c)
Appreciate your kind advice.
