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authorAnshuman Khandual <khandual@linux.vnet.ibm.com>2017-07-11 01:48:12 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-11 02:32:31 +0300
commite35ef6397b8273a0059a2b837c26f92b0ecf8596 (patch)
tree3c49d5c78777d3824c15ec5998762acd83b98d75 /mm/cma.c
parent78c72746f56b212ecf768a7e67cee3b7cf89238c (diff)
downloadlinux-e35ef6397b8273a0059a2b837c26f92b0ecf8596.tar.xz
mm/cma.c: warn if the CMA area could not be activated
While activating a CMA area we check to make sure that all the PFNs in the range are inside the same zone. This is a requirement for alloc_contig_range() to work. Any CMA area failing the check is disabled for good. This happens silently right now making all future cma_alloc() allocations failure inevitable. Here we add an error message stating that the CMA area could not be activated which makes it easier to explain any future cma_alloc() failures on it. While in there, change the bail out goto label from 'err' to 'not_in_zone' which makes more sense. Link: http://lkml.kernel.org/r/20170605023729.26303-1-khandual@linux.vnet.ibm.com Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/cma.c')
-rw-r--r--mm/cma.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/cma.c b/mm/cma.c
index 978b4a1441ef..9e4549191789 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -127,7 +127,7 @@ static int __init cma_activate_area(struct cma *cma)
* 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);
@@ -141,7 +141,8 @@ 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;
return -EINVAL;