[PATCH v2 0/2] arm64: don't call early_*map() post paging_init()

[Ard Biesheuvel]

On 6 January 2015 at 13:59, Will Deacon <will.deacon at arm.com> wrote:
> On Tue, Jan 06, 2015 at 01:41:11PM +0000, Leif Lindholm wrote:
>> This (tiny) series resolves a fairly serious problem with
>> early_ioremap/iounmap/memremap/memunmap on arm64. These functions
>> cannot safely be called after paging_init(), but the sanity check
>> was not triggering.
>>
>> As a result, a fixmap entry was incorrectly cleared during
>> early_initcalls on arm64 UEFI systems.
>>
>> 1/2 reworks the arm64 UEFI support code to not attempt these calls
>> and
>> 2/2 enables the sanity check
>>
>> Changes since v1:
>> - Rebased to v3.19-rc3
>> - Added 'Fixes:' tags
>> - Reworked 1/2 to restore call to efi_setup_idmap() to the original
>>   location in the boot process.
>
> Looks reasonable to me; do they need a CC stable,

Yes, but with a note that both patches should be taken and the order
is retained, or we break bisect.

-- 
Ard.


> or is this not a problem
> that matters in practice?
>
> Will