[SRU][F:linux-aws][PATCH 0/1] Backport "iommu/arm-smmu-v3: Don't reserve implementation defined register space"

[Magali Lemes]

BugLink: https://bugs.launchpad.net/bugs/2067864

[Impact]
In order to solve boot issues with new instance types running the 5.4 kernels,
AWS has requested a backport of upstream commit 52f3fab0067d
("iommu/arm-smmu-v3: Don't reserve implementation defined register space").

[Fix]
There was a conflict when adding arm_smmu_ioremap() due to the current
context missing ab246774713e ("iommu/arm-smmu-v3: Unregister IOMMU and
bus ops on device removal").

[Test]
It's been tested that the new instances can boot successfully with the AWS 5.4
kernels with this patch applied.

[Where problems could occur]
This touches probing of the ARM SMMUv3 driver, which might lead to boot
failures or system instability.

[Other info]
SF #00407928

Jean-Philippe Brucker (1):
  iommu/arm-smmu-v3: Don't reserve implementation defined register space

 drivers/iommu/arm-smmu-v3.c | 35 +++++++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

-- 
2.34.1