Re: FAILED: patch "[PATCH] io_uring/kbuf: account ring io_buffer_list memory" failed to apply to 6.1-stable tree

[Jens Axboe <axboe@kernel.dk>]

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On 6/19/25 11:40 PM, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 6.1-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
> 
> To reproduce the conflict and resubmit, you may use the following commands:
> 
> git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
> git checkout FETCH_HEAD
> git cherry-pick -x 475a8d30371604a6363da8e304a608a5959afc40
> # <resolve conflicts, build, test, etc.>
> git commit -s
> git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025062043-header-audio-50d2@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Here's a 6.1-stable variant.

-- 
Jens Axboe

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From ab1fb42ebf1ccf33ed8c4d4cfd705d2ff8bcf766 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Tue, 13 May 2025 18:26:46 +0100
Subject: [PATCH 1/2] io_uring/kbuf: account ring io_buffer_list memory

Commit 475a8d30371604a6363da8e304a608a5959afc40 upstream.

Follow the non-ringed pbuf struct io_buffer_list allocations and account
it against the memcg. There is low chance of that being an actual
problem as ring provided buffer should either pin user memory or
allocate it, which is already accounted.

Cc: stable@vger.kernel.org # 6.1
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3985218b50d341273cafff7234e1a7e6d0db9808.1747150490.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/kbuf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index 147ada2ce747..d18fe3996ddb 100644
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -510,7 +510,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
 		if (bl->buf_nr_pages || !list_empty(&bl->buf_list))
 			return -EEXIST;
 	} else {
-		free_bl = bl = kzalloc(sizeof(*bl), GFP_KERNEL);
+		free_bl = bl = kzalloc(sizeof(*bl), GFP_KERNEL_ACCOUNT);
 		if (!bl)
 			return -ENOMEM;
 	}
-- 
2.50.0