arm64: Fix pte_modify() to preserve the hardware dirty information
authorCatalin Marinas <catalin.marinas@arm.com>
Fri, 11 Sep 2015 17:22:01 +0000 (18:22 +0100)
committerWill Deacon <will.deacon@arm.com>
Mon, 14 Sep 2015 11:28:41 +0000 (12:28 +0100)
commit62d96c71d248834af2891293dc23cc344ae2ec36
tree0cab58cfe00d23e610a671f13ed7dc3e2ee66903
parentb847415ce96efef819534b230d84695b1bc6d36b
arm64: Fix pte_modify() to preserve the hardware dirty information

The pte_modify() function with hardware AF/DBM enabled must transfer the
hardware dirty information to the software PTE_DIRTY bit. However, it
was setting this bit in newprot and the mask does not cover such bit.
This patch sets PTE_DIRTY on the original pte which will be preserved in
the returned value.

Fixes: 2f4b829c625e ("arm64: Add support for hardware updates of the access and dirty pte bits")
Cc: Julien Grall <julien.grall@citrix.com>
Tested-by: Julien Grall <julien.grall@citrix.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
arch/arm64/include/asm/pgtable.h