[Crash-utility] Re: [PATCH v2] Resolve BLK_MQ_F_TAG_HCTX_SHARED at runtime

Date: Mon, 15 Dec 2025 10:49:30 +1300 From: Tao Liu&lt;ltao(a)redhat.com&gt; Subject: [Crash-utility] [PATCH v2] Resolve BLK_MQ_F_TAG_HCTX_SHARED at runtime To:devel@lists.crash-utility.osci.io Cc: Tao Liu&lt;ltao(a)redhat.com&gt; Message-ID:<20251214214929.10250-2-ltao@redhat.com> Content-Type: text/plain; charset="US-ASCII"; x-default=true Though upstream kernel have defined BLK_MQ_F_TAG_HCTX_SHARED as (1 << 3), the value might be set different, e.g. [1]. In this patch, we will use enumerator_value() to get its value at runtime, to make the code more adaptable. [1]:https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-8/-/b... Signed-off-by: Tao Liu&lt;ltao(a)redhat.com&gt; --- dev.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/dev.c b/dev.c index 27318e8..1332b0e 100644 --- a/dev.c +++ b/dev.c @@ -4326,11 +4326,11 @@ struct bt_iter_data { #define MQ_RQ_IN_FLIGHT 1 #define REQ_OP_BITS 8 #define REQ_OP_MASK ((1 << REQ_OP_BITS) - 1) -#define BLK_MQ_F_TAG_HCTX_SHARED (1 << 3) +static long blk_hctx_shared = 0; static bool blk_mq_is_shared_tags(unsigned int flags) { - return flags & BLK_MQ_F_TAG_HCTX_SHARED; + return flags & blk_hctx_shared; } static uint op_is_write(uint op) @@ -4952,6 +4952,7 @@ void diskio_init(void) MEMBER_OFFSET_INIT(request_queue_tag_set, "request_queue", "tag_set"); MEMBER_OFFSET_INIT(blk_mq_tag_set_flags, "blk_mq_tag_set", "flags"); MEMBER_OFFSET_INIT(blk_mq_tag_set_shared_tags, "blk_mq_tag_set", "shared_tags"); + enumerator_value("BLK_MQ_F_TAG_HCTX_SHARED", &blk_hctx_shared); dt->flags |= DISKIO_INIT; } -- 2.47.0