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bianbu-linux-6.6/arch/xtensa
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Ard Biesheuvel b9bc36704c ARM, xtensa: highmem: avoid clobbering non-page aligned memory reservations 
free_highpages() iterates over the free memblock regions in high
memory, and marks each page as available for the memory management
system.

Until commit cddb5ddf2b ("arm, xtensa: simplify initialization of
high memory pages") it rounded beginning of each region upwards and end of
each region downwards.

However, after that commit free_highmem() rounds the beginning and end of
each region downwards, and we may end up freeing a page that is
memblock_reserve()d, resulting in memory corruption.

Restore the original rounding of the region boundaries to avoid freeing
reserved pages.

Fixes: cddb5ddf2b ("arm, xtensa: simplify initialization of high memory pages")
Link: https://lore.kernel.org/r/20201029110334.4118-1-ardb@kernel.org/
Link: https://lore.kernel.org/r/20201031094345.6984-1-rppt@kernel.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Co-developed-by:  Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
2020-11-04 10:42:57 +02:00
..
boot Kbuild updates for v5.9 2020-08-09 14:10:26 -07:00
configs xtensa: reorganize vectors placement 2020-02-04 21:57:02 -08:00
include xtensa: propagate the calling conventions change down into csum_partial_copy_generic() 2020-08-20 15:45:21 -04:00
kernel treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
lib xtensa: propagate the calling conventions change down into csum_partial_copy_generic() 2020-08-20 15:45:21 -04:00
mm ARM, xtensa: highmem: avoid clobbering non-page aligned memory reservations 2020-11-04 10:42:57 +02:00
oprofile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
platforms xtensa/simdisk: remove the call to check_disk_change 2020-07-08 16:20:01 -06:00
variants xtensa: add test_kc705_be variant 2018-08-20 12:34:45 -07:00
Kconfig Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-22 09:59:21 -07:00
Kconfig.debug xtensa: make stack dump size configurable 2019-11-26 11:33:39 -08:00
Makefile xtensa: add XIP kernel support 2019-11-26 11:33:38 -08:00