[PATCH 03/10] Use percpu stats

Anton Blanchard anton at samba.org
Wed Sep 1 03:51:35 UTC 2010


Hi,

> Also remove references to removed stats (ex: good_comress).

I'm getting an oops when running mkfs on zram:

NIP [d0000000030e0340] .zram_inc_stat+0x58/0x84 [zram]
[c00000006d58f720] [d0000000030e091c] .zram_make_request+0xa8/0x6a0 [zram]
[c00000006d58f840] [c00000000035795c] .generic_make_request+0x390/0x434
[c00000006d58f950] [c000000000357b14] .submit_bio+0x114/0x140
[c00000006d58fa20] [c000000000361778] .blkdev_issue_discard+0x1ac/0x250
[c00000006d58fb10] [c000000000361f68] .blkdev_ioctl+0x358/0x7fc
[c00000006d58fbd0] [c0000000001c1c1c] .block_ioctl+0x6c/0x90
[c00000006d58fc70] [c0000000001984c4] .do_vfs_ioctl+0x660/0x6d4
[c00000006d58fd70] [c0000000001985a0] .SyS_ioctl+0x68/0xb0

Since disksize no longer starts as 0 it looks like we can call
zram_make_request before the device has been initialised. The patch below
fixes the immediate problem but this would go away if we move the
initialisation function elsewhere (as suggested in another thread).

Signed-off-by: Anton Blanchard <anton at samba.org>
---

Index: powerpc.git/drivers/staging/zram/zram_drv.c
===================================================================
--- powerpc.git.orig/drivers/staging/zram/zram_drv.c	2010-09-01 12:35:14.286515175 +1000
+++ powerpc.git/drivers/staging/zram/zram_drv.c	2010-09-01 12:35:24.167930504 +1000
@@ -441,6 +441,12 @@ static int zram_make_request(struct requ
 	int ret = 0;
 	struct zram *zram = queue->queuedata;
 
+	if (unlikely(!zram->init_done)) {
+		set_bit(BIO_UPTODATE, &bio->bi_flags);
+		bio_endio(bio, 0);
+		return 0;
+	}
+
 	if (unlikely(!valid_io_request(zram, bio))) {
 		zram_inc_stat(zram, ZRAM_STAT_INVALID_IO);
 		bio_io_error(bio);



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