Revert "mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE"
This reverts the following commits that change CMA design in MM.
3d2054ad8c2d ("ARM: CMA: avoid double mapping to the CMA area if CONFIG_HIGHMEM=y")
1d47a3ec09b5 ("mm/cma: remove ALLOC_CMA")
bad8c6c0b114 ("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 <ville.syrjala@linux.intel.com>
Acked-by: Laura Abbott <labbott@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/cma.c b/mm/cma.c
index aa40e6c..5809bbe 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -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 @@
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 @@
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 @@
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 @@
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