On Thu, Jan 20, 2022 at 09:51:18PM +0800, Ming Lei wrote:
> Then Can you figure out where blk_mq_queue_tag_busy_iter+0x1e4 points to
> in source code? And what is NULL pointer?
Here we go:
/usr/src/debug/kernel-default-5.3.18-59.27.1.x86_64/linux-5.3/linux-obj/../include/linux/sbitmap.h: 249
0xffffffffb244a254 <blk_mq_queue_tag_busy_iter+484>: mov (%rax),%rdx
234static inline void __sbitmap_for_each_set(struct sbitmap *sb,
235 unsigned int start,
236 sb_for_each_fn fn, void *data)
237{
238 unsigned int index;
239 unsigned int nr;
240 unsigned int scanned = 0;
241
242 if (start >= sb->depth)
243 start = 0;
244 index = SB_NR_TO_INDEX(sb, start);
245 nr = SB_NR_TO_BIT(sb, start);
246
247 while (scanned < sb->depth) {
248 unsigned long word;
249 unsigned int depth = min_t(unsigned int,
250 sb->map[index].depth - nr,
251 sb->depth - scanned);
Attachment:
blk_mq_queue_tag_busy_iter.dis
Description: application/vnd.mobius.dis
