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[87.16.204.83]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a773a87bfsm64239235e9.2.2026.04.28.05.15.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Apr 2026 05:15:32 -0700 (PDT) Date: Tue, 28 Apr 2026 14:15:26 +0200 From: Stefano Garzarella To: Hamza Mahfooz Cc: netdev@vger.kernel.org, "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Michael Kelley , Himadri Pandya , linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, stable@kernel.vger.org Subject: Re: [PATCH] hv_sock: fix ARM64 support Message-ID: References: <20260428110530.1717647-1-hamzamahfooz@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20260428110530.1717647-1-hamzamahfooz@linux.microsoft.com> On Tue, Apr 28, 2026 at 07:05:30AM -0400, Hamza Mahfooz wrote: >VMBUS ring buffers must be page aligned. Therefore, the current value of >24K presents a challenge on ARM64 kernels (with 64K pages). So, use >VMBUS_RING_SIZE() to ensure they are always aligned and large enough to >hold all of the relevant data. > >Cc: stable@kernel.vger.org mmm, this is the first time I've seen this address used for stable. Even after searching in the log, I don't see anyone else who's used it. Where did you get it from? From Documentation/process/stable-kernel-rules.rst : To have a patch you submit for mainline inclusion later automatically picked up for stable trees, add this tag in the sign-off area:: Cc: stable@vger.kernel.org The patch LGTM. Thanks, Stefano >Fixes: 77ffe33363c0 ("hv_sock: use HV_HYP_PAGE_SIZE for Hyper-V communication") >Tested-by: Dexuan Cui >Reviewed-by: Dexuan Cui >Signed-off-by: Hamza Mahfooz >--- > net/vmw_vsock/hyperv_transport.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > >diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c >index 069386a74557..40f09b23efa3 100644 >--- a/net/vmw_vsock/hyperv_transport.c >+++ b/net/vmw_vsock/hyperv_transport.c >@@ -375,10 +375,10 @@ static void hvs_open_connection(struct vmbus_channel *chan) > } else { > sndbuf = max_t(int, sk->sk_sndbuf, RINGBUFFER_HVS_SND_SIZE); > sndbuf = min_t(int, sndbuf, RINGBUFFER_HVS_MAX_SIZE); >- sndbuf = ALIGN(sndbuf, HV_HYP_PAGE_SIZE); >+ sndbuf = VMBUS_RING_SIZE(sndbuf); > rcvbuf = max_t(int, sk->sk_rcvbuf, RINGBUFFER_HVS_RCV_SIZE); > rcvbuf = min_t(int, rcvbuf, RINGBUFFER_HVS_MAX_SIZE); >- rcvbuf = ALIGN(rcvbuf, HV_HYP_PAGE_SIZE); >+ rcvbuf = VMBUS_RING_SIZE(rcvbuf); > } > > chan->max_pkt_size = HVS_MAX_PKT_SIZE; >-- >2.54.0 >