A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-30 19:51:31 -04:00
Code Issues Projects Releases Packages Wiki Activity

Revert "mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE"

Browse source 
This reverts the following commits that change CMA design in MM.

 3d2054ad8c ("ARM: CMA: avoid double mapping to the CMA area if CONFIG_HIGHMEM=y")

 1d47a3ec09 ("mm/cma: remove ALLOC_CMA")

 bad8c6c0b1 ("mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE")

Ville reported a following error on i386.

  Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
  microcode: microcode updated early to revision 0x4, date = 2013-06-28
  Initializing CPU#0
  Initializing HighMem for node 0 (000377fe:00118000)
  Initializing Movable for node 0 (00000001:00118000)
  BUG: Bad page state in process swapper  pfn:377fe
  page:f53effc0 count:0 mapcount:-127 mapping:00000000 index:0x0
  flags: 0x80000000()
  raw: 80000000 00000000 00000000 ffffff80 00000000 00000100 00000200 00000001
  page dumped because: nonzero mapcount
  Modules linked in:
  CPU: 0 PID: 0 Comm: swapper Not tainted 4.17.0-rc5-elk+ #145
  Hardware name: Dell Inc. Latitude E5410/03VXMC, BIOS A15 07/11/2013
  Call Trace:
   dump_stack+0x60/0x96
   bad_page+0x9a/0x100
   free_pages_check_bad+0x3f/0x60
   free_pcppages_bulk+0x29d/0x5b0
   free_unref_page_commit+0x84/0xb0
   free_unref_page+0x3e/0x70
   __free_pages+0x1d/0x20
   free_highmem_page+0x19/0x40
   add_highpages_with_active_regions+0xab/0xeb
   set_highmem_pages_init+0x66/0x73
   mem_init+0x1b/0x1d7
   start_kernel+0x17a/0x363
   i386_start_kernel+0x95/0x99
   startup_32_smp+0x164/0x168

The reason for this error is that the span of MOVABLE_ZONE is extended
to whole node span for future CMA initialization, and, normal memory is
wrongly freed here.  I submitted the fix and it seems to work, but,
another problem happened.

It's so late time to fix the later problem so I decide to reverting the
series.

Reported-by: Ville Syrjälä <[email protected]>
Acked-by: Laura Abbott <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Joonsoo Kim <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Joonsoo Kim 2018-05-23 10:18:21 +09:00 • committed by Linus Torvalds
commit d883c6cf3b
7 changed files with 49 additions and 145 deletions
Download patch file Download diff file Expand all files Collapse all files

83
mm/cma.c
View file

@ -39,7 +39,6 @@
#include <trace/events/cma.h>
#include "cma.h"
#include "internal.h"
struct cma cma_areas[MAX_CMA_AREAS];
unsigned cma_area_count;
@ -110,25 +109,23 @@ static int __init cma_activate_area(struct cma *cma)
if (!cma->bitmap)
return -ENOMEM;
WARN_ON_ONCE(!pfn_valid(pfn));
zone = page_zone(pfn_to_page(pfn));
do {
unsigned j;
base_pfn = pfn;
if (!pfn_valid(base_pfn))
goto err;
zone = page_zone(pfn_to_page(base_pfn));
for (j = pageblock_nr_pages; j; --j, pfn++) {
if (!pfn_valid(pfn))
goto err;
WARN_ON_ONCE(!pfn_valid(pfn));
/*
* In init_cma_reserved_pageblock(), present_pages
* is adjusted with assumption that all pages in
* the pageblock come from a single zone.
* alloc_contig_range requires the pfn range
* specified to be in the same zone. Make this
* simple by forcing the entire CMA resv range
* to be in the same zone.
*/
if (page_zone(pfn_to_page(pfn)) != zone)
goto err;
goto not_in_zone;
}
init_cma_reserved_pageblock(pfn_to_page(base_pfn));
} while (--i);
@ -142,7 +139,7 @@ static int __init cma_activate_area(struct cma *cma)
return 0;
err:
not_in_zone:
pr_err("CMA area %s could not be activated\n", cma->name);
kfree(cma->bitmap);
cma->count = 0;
@ -152,41 +149,6 @@ err:
static int __init cma_init_reserved_areas(void)
{
int i;
struct zone *zone;
pg_data_t *pgdat;
if (!cma_area_count)
return 0;
for_each_online_pgdat(pgdat) {
unsigned long start_pfn = UINT_MAX, end_pfn = 0;
zone = &pgdat->node_zones[ZONE_MOVABLE];
/*
* In this case, we cannot adjust the zone range
* since it is now maximum node span and we don't
* know original zone range.
*/
if (populated_zone(zone))
continue;
for (i = 0; i < cma_area_count; i++) {
if (pfn_to_nid(cma_areas[i].base_pfn) !=
pgdat->node_id)
continue;
start_pfn = min(start_pfn, cma_areas[i].base_pfn);
end_pfn = max(end_pfn, cma_areas[i].base_pfn +
cma_areas[i].count);
}
if (!end_pfn)
continue;
zone->zone_start_pfn = start_pfn;
zone->spanned_pages = end_pfn - start_pfn;
}
for (i = 0; i < cma_area_count; i++) {
int ret = cma_activate_area(&cma_areas[i]);
@ -195,32 +157,9 @@ static int __init cma_init_reserved_areas(void)
return ret;
}
/*
* Reserved pages for ZONE_MOVABLE are now activated and
* this would change ZONE_MOVABLE's managed page counter and
* the other zones' present counter. We need to re-calculate
* various zone information that depends on this initialization.
*/
build_all_zonelists(NULL);
for_each_populated_zone(zone) {
if (zone_idx(zone) == ZONE_MOVABLE) {
zone_pcp_reset(zone);
setup_zone_pageset(zone);
} else
zone_pcp_update(zone);
set_zone_contiguous(zone);
}
/*
* We need to re-init per zone wmark by calling
* init_per_zone_wmark_min() but doesn't call here because it is
* registered on core_initcall and it will be called later than us.
*/
return 0;
}
pure_initcall(cma_init_reserved_areas);
core_initcall(cma_init_reserved_areas);
/**
* cma_init_reserved_mem() - create custom contiguous area from reserved memory