Max Filippov 53c86c2d90 xtensa: fix high memory/reserved memory collision ... commit 6ac5a11dc6 upstream. Xtensa memory initialization code frees high memory pages without checking whether they are in the reserved memory regions or not. That results in invalid value of totalram_pages and duplicate page usage by CMA and highmem. It produces a bunch of BUGs at startup looking like this: BUG: Bad page state in process swapper pfn:70800 page:be60c000 count:0 mapcount:-127 mapping: (null) index:0x1 flags: 0x80000000() raw: 80000000 00000000 00000001 ffffff80 00000000 be60c014 be60c014 0000000a page dumped because: nonzero mapcount Modules linked in: CPU: 0 PID: 1 Comm: swapper Tainted: G B 4.16.0-rc1-00015-g7928b2cbe55b-dirty #23 Stack: bd839d33 00000000 00000018 ba97b64c a106578c bd839d70 be60c000 00000000 a1378054 bd86a000 00000003 ba97b64c a1066166 bd839da0 be60c000 ffe00000 a1066b58 bd839dc0 be504000 00000000 000002f4 bd838000 00000000 0000001e Call Trace: [<a1065734>] bad_page+0xac/0xd0 [<a106578c>] free_pages_check_bad+0x34/0x4c [<a1066166>] __free_pages_ok+0xae/0x14c [<a1066b58>] __free_pages+0x30/0x64 [<a1365de5>] init_cma_reserved_pageblock+0x35/0x44 [<a13682dc>] cma_init_reserved_areas+0xf4/0x148 [<a10034b8>] do_one_initcall+0x80/0xf8 [<a1361c16>] kernel_init_freeable+0xda/0x13c [<a125b59d>] kernel_init+0x9/0xd0 [<a1004304>] ret_from_kernel_thread+0xc/0x18 Only free high memory pages that are not reserved. Cc: stable@vger.kernel.org Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-02-28 10:19:38 +01:00
..
Makefile	xtensa: support ioremap for memory outside KIO region	2016-01-11 17:37:36 +03:00
cache.c	xtensa: mm/cache: add missing EXPORT_SYMBOLs	2017-08-01 11:17:35 -07:00
fault.c	xtensa: migrate exception table users off module.h and onto extable.h	2017-01-24 12:41:46 -05:00
highmem.c	sched/preempt, mm/kmap: Explicitly disable/enable preemption in kmap_atomic_*	2015-05-19 08:39:14 +02:00
init.c	xtensa: fix high memory/reserved memory collision	2018-02-28 10:19:38 +01:00
ioremap.c	xtensa: support ioremap for memory outside KIO region	2016-01-11 17:37:36 +03:00
misc.S	xtensa: implement clear_user_highpage and copy_user_highpage	2014-08-14 11:59:20 +04:00
mmu.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
tlb.c	mm: differentiate page_mapped() from page_mapcount() for compound pages	2016-01-15 17:56:32 -08:00