20 Feb
2018
20 Feb
'18
3:29 p.m.
On Tue, Feb 20, 2018 at 11:40:06AM +0000, Will Deacon wrote:
Commit 2ce77f6d8a9ae9ce6d80397d88bdceb84a2004cd upstream.
When KASAN is enabled, the swapper page table contains many identical mappings of the zero page, which can lead to a stall during boot whilst the G -> nG code continually walks the same page table entries looking for global mappings.
This patch sets the nG bit (bit 11, which is IGNORED) in table entries after processing the subtree so we can easily skip them if we see them a second time.
Cc: stable@vger.kernel.org # 4.14+
Now queued up, thanks.
greg k-h