tree b88e67dcdce66832980245bcc450233599f857d0
parent 13b9d47ed36e8019a99c798b84c341ef75868e02
author Russell King <rmk@dyn-67.arm.linux.org.uk> 1126793879 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> 1126793879 +0100

[ARM] Tighten pfn_valid() test.

Thomas Gleixner reported that mmaping and unmapping each physical
page in turn eventually caused the kernel to oops.  It appears
that pfn_valid() in the discontigmem case was too simplistic for
proper operation.

Tighten the logic so we also check if the PFN is within the range
of the selected memory node.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>