Patch "x86/setup: Fix low identity map for >= 2GB kernel range" has been added to the 4.3-stable tree

This is a note to let you know that I've just added the patch titled

x86/setup: Fix low identity map for >= 2GB kernel range

to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
x86-setup-fix-low-identity-map-for-2gb-kernel-range.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Krzysztof Mazur <[email protected]>
Date: Fri, 6 Nov 2015 14:18:36 +0100
Subject: x86/setup: Fix low identity map for >= 2GB kernel range

From: Krzysztof Mazur <[email protected]>

commit 68accac392d859d24adcf1be3a90e41f978bd54c upstream.

The commit f5f3497cad8c extended the low identity mapping. However, if the kernel uses more than 2 GB (VMSPLIT_2G_OPT or VMSPLIT_1G memory split), the normal memory mapping is overwritten by the low identity mapping causing a crash. To avoid overwritting, limit the low identity map to cover only memory before kernel range (PAGE_OFFSET).

---
 arch/x86/kernel/setup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -1180,7 +1180,7 @@ void __init setup_arch(char **cmdline_p)
 	 */
 	clone_pgd_range(initial_page_table,
 			swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
-			KERNEL_PGD_PTRS);
+			min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
 #endif
 
 	tboot_probe();

Patches currently in stable-queue which might be from [email protected] are

queue-4.3/x86-setup-fix-low-identity-map-for-2gb-kernel-range.patch