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authorBorislav Petkov <bp@suse.de>2019-04-20 14:06:37 +0200
committerBorislav Petkov <bp@suse.de>2019-06-08 17:33:10 +0200
commitde0e0624d86ff9fc512dedb297f8978698abf21a (patch)
tree28d6d96ec9e4765a65a096cf1e26d0611e929193 /drivers/ras/cec.c
parent6d8e294bf5f0e85c34e8b14b064e2965f53f38b0 (diff)
downloadlinux-de0e0624d86ff9fc512dedb297f8978698abf21a.tar.bz2
RAS/CEC: Check count_threshold unconditionally
The count_threshold should be checked unconditionally, after insertion too, so that a count_threshold value of 1 can cause an immediate offlining. I.e., offline the page on the *first* error encountered. Add comments to make it clear what cec_add_elem() does, while at it. Reported-by: WANG Chao <chao.wang@ucloud.cn> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-edac@vger.kernel.org Link: https://lkml.kernel.org/r/20190418034115.75954-3-chao.wang@ucloud.cn
Diffstat (limited to 'drivers/ras/cec.c')
-rw-r--r--drivers/ras/cec.c27
1 files changed, 10 insertions, 17 deletions
diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
index f5795adc5a6e..73a975c26f9f 100644
--- a/drivers/ras/cec.c
+++ b/drivers/ras/cec.c
@@ -294,6 +294,7 @@ int cec_add_elem(u64 pfn)
ca->ces_entered++;
+ /* Array full, free the LRU slot. */
if (ca->n == MAX_ELEMS)
WARN_ON(!del_lru_elem_unlocked(ca));
@@ -306,24 +307,17 @@ int cec_add_elem(u64 pfn)
(void *)&ca->array[to],
(ca->n - to) * sizeof(u64));
- ca->array[to] = (pfn << PAGE_SHIFT) |
- (DECAY_MASK << COUNT_BITS) | 1;
-
+ ca->array[to] = pfn << PAGE_SHIFT;
ca->n++;
-
- ret = 0;
-
- goto decay;
}
- count = COUNT(ca->array[to]);
-
- if (count < count_threshold) {
- ca->array[to] |= (DECAY_MASK << COUNT_BITS);
- ca->array[to]++;
+ /* Add/refresh element generation and increment count */
+ ca->array[to] |= DECAY_MASK << COUNT_BITS;
+ ca->array[to]++;
- ret = 0;
- } else {
+ /* Check action threshold and soft-offline, if reached. */
+ count = COUNT(ca->array[to]);
+ if (count >= count_threshold) {
u64 pfn = ca->array[to] >> PAGE_SHIFT;
if (!pfn_valid(pfn)) {
@@ -338,15 +332,14 @@ int cec_add_elem(u64 pfn)
del_elem(ca, to);
/*
- * Return a >0 value to denote that we've reached the offlining
- * threshold.
+ * Return a >0 value to callers, to denote that we've reached
+ * the offlining threshold.
*/
ret = 1;
goto unlock;
}
-decay:
ca->decay_count++;
if (ca->decay_count >= CLEAN_ELEMS)