linux-kernel - Re: [PATCHv3 1/4] zram: introduce writeback bio batching support

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Message-ID: <tencent_547137D7C2F3EDBCD52FB12EE2A202EEE307@qq.com>
Date: Tue, 18 Nov 2025 10:08:16 +0800
From: Yuwen Chen <ywen.chen@...mail.com>
To: bgeffon@...gle.com
Cc: akpm@...ux-foundation.org,
	licayy@...look.com,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	minchan@...gle.com,
	minchan@...nel.org,
	richardycc@...gle.com,
	senozhatsky@...omium.org,
	ywen.chen@...mail.com
Subject: Re: [PATCHv3 1/4] zram: introduce writeback bio batching support

On Mon, 17 Nov 2025 10:19:22 -0500, Sergey Senozhatsky wrote:
- index = pps->index;
  zram_slot_lock(zram, index);
  /*
   * scan_slots() sets ZRAM_PP_SLOT and relases slot lock, so
@@ -775,67 +999,46 @@ static int zram_writeback_slots(struct z
   */
  if (!zram_test_flag(zram, index, ZRAM_PP_SLOT))
  goto next;
- if (zram_read_from_zspool(zram, page, index))
+ if (zram_read_from_zspool(zram, req->page, index))
  goto next;
  zram_slot_unlock(zram, index);

I tested the reorganized patch on my end and found that it didn't work
properly. Currently, it has been found that this index is uninitialized.