]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/commit
s390/vmem: fix identity mapping
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Tue, 10 May 2016 10:10:22 +0000 (12:10 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Wed, 11 May 2016 08:20:30 +0000 (10:20 +0200)
commitc34a69059d7876e0793eb410deedfb08ccb22b02
tree18d24e5fd7a5f8e881467035e3e61368d1834adb
parentca21872e43e82c2a5c2e056ee4aea40a921720b1
s390/vmem: fix identity mapping

The identity mapping is suboptimal for the last 2GB frame. The mapping
will be established with a mix of 4KB and 1MB mappings instead of a
single 2GB mapping.

This happens because of a off-by-one bug introduced with
commit 50be63450728 ("s390/mm: Convert bootmem to memblock").

Currently the identity mapping looks like this:

0x0000000080000000-0x0000000180000000        4G PUD RW
0x0000000180000000-0x00000001fff00000     2047M PMD RW
0x00000001fff00000-0x0000000200000000        1M PTE RW

With the bug fixed it looks like this:

0x0000000080000000-0x0000000200000000        6G PUD RW

Fixes: 50be63450728 ("s390/mm: Convert bootmem to memblock")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/mm/vmem.c