11 Jan
2018
11 Jan
'18
8:17 p.m.
On Thu, Jan 11, 2018 at 12:10 PM, Greg Kroah-Hartman gregkh@linuxfoundation.org wrote:
Nice, but why does this not show up in 4.9 and 4.14 and Linus's tree as well on this hardware? Nor on the SLES12 SP3 kernel?
What is different there that 4.4 requires? That worries me more than your fix (which looks good to me, fwiw.)
I really think it's simply that since v4.6, we've had commit 67a9108ed431 ("x86/efi: Build our own page table structures"), so no normal EFI use actually uses the old legacy mapping unless you passed in "efi=old_map" on the kernel command line.
So the bug is there in all versions, it's just that it's normally only noticeable in 4.4.
But I might be missing some other difference, so take that with a pinch of salt.
Linus