On 11/5/18 12:39 PM, Ard Biesheuvel wrote:
> Hi Florian,
>
> On 31 October 2018 at 20:28, Florian Fainelli <f.fainelli@xxxxxxxxx> wrote:
>> ARM64 is the only architecture that re-defines
>> __early_init_dt_declare_initrd() in order for that function to populate
>> initrd_start/initrd_end with physical addresses instead of virtual
>> addresses. Instead of having an override we can leverage
>> drivers/of/fdt.c populating phys_initrd_start/phys_initrd_size to
>> populate those variables for us.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
>> ---
>> arch/arm64/mm/init.c | 19 +++++++++----------
>> 1 file changed, 9 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
>> index 3cf87341859f..00ef2166bb73 100644
>> --- a/arch/arm64/mm/init.c
>> +++ b/arch/arm64/mm/init.c
>> @@ -72,8 +72,8 @@ static int __init early_initrd(char *p)
>> if (*endp == ',') {
>> size = memparse(endp + 1, NULL);
>>
>> - initrd_start = start;
>> - initrd_end = start + size;
>> + phys_initrd_start = start;
>> + phys_initrd_size = size;
>> }
>> return 0;
>> }
>> @@ -408,14 +408,14 @@ void __init arm64_memblock_init(void)
>> memblock_add(__pa_symbol(_text), (u64)(_end - _text));
>> }
>>
>> - if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_start) {
>> + if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {
>> /*
>> * Add back the memory we just removed if it results in the
>> * initrd to become inaccessible via the linear mapping.
>> * Otherwise, this is a no-op
>> */
>> - u64 base = initrd_start & PAGE_MASK;
>> - u64 size = PAGE_ALIGN(initrd_end) - base;
>> + u64 base = phys_initrd_start & PAGE_MASK;
>> + u64 size = PAGE_ALIGN(phys_initrd_size);
>>
>> /*
>> * We can only add back the initrd memory if we don't end up
>> @@ -460,12 +460,11 @@ void __init arm64_memblock_init(void)
>> */
>> memblock_reserve(__pa_symbol(_text), _end - _text);
>> #ifdef CONFIG_BLK_DEV_INITRD
>> - if (initrd_start) {
>> - memblock_reserve(initrd_start, initrd_end - initrd_start);
>> -
>> + if (phys_initrd_size) {
>> /* the generic initrd code expects virtual addresses */
>> - initrd_start = __phys_to_virt(initrd_start);
>> - initrd_end = __phys_to_virt(initrd_end);
>> + initrd_start = __phys_to_virt(phys_initrd_start);
>> + initrd_end = initrd_start + phys_initrd_size;
>> + initrd_below_start_ok = 0;
>
> Where is this assignment coming from?
__early_init_dt_declare_initrd() sets initrd_below_start_ok to 1 though
after patch #5 this is not necessary any more.
--
Florian
