From: Jeffrey Hugo <quic_jhugo@quicinc.com>
To: <decui@microsoft.com>, <wei.liu@kernel.org>, <kys@microsoft.com>,
<haiyangz@microsoft.com>, <sthemmin@microsoft.com>,
<lpieralisi@kernel.org>, <bhelgaas@google.com>,
<linux-hyperv@vger.kernel.org>, <linux-pci@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <mikelley@microsoft.com>,
<robh@kernel.org>, <kw@linux.com>, <helgaas@kernel.org>,
<alex.williamson@redhat.com>, <boqun.feng@gmail.com>,
<Boqun.Feng@microsoft.com>
Cc: Carl Vanderlip <quic_carlv@quicinc.com>
Subject: Re: [PATCH] PCI: hv: Fix the definiton of vector in hv_compose_msi_msg()
Date: Tue, 16 Aug 2022 10:01:28 -0600 [thread overview]
Message-ID: <5e4258b6-d253-c8bc-f697-c21d7eff63a5@quicinc.com> (raw)
In-Reply-To: <20220815185505.7626-1-decui@microsoft.com>
On 8/15/2022 12:55 PM, Dexuan Cui wrote:
> The local variable 'vector' must be u32 rather than u8: see the
> struct hv_msi_desc3.
>
> 'vector_count' should be u16 rather than u8: see struct hv_msi_desc,
> hv_msi_desc2 and hv_msi_desc3.
>
> Fixes: a2bad844a67b ("PCI: hv: Fix interrupt mapping for multi-MSI")
> Signed-off-by: Dexuan Cui <decui@microsoft.com>
> Cc: Jeffrey Hugo <quic_jhugo@quicinc.com>
> Cc: Carl Vanderlip <quic_carlv@quicinc.com>
> ---
>
> The patch should be appplied after the earlier patch:
> [PATCH] PCI: hv: Only reuse existing IRTE allocation for Multi-MSI
> https://lwn.net/ml/linux-kernel/20220804025104.15673-1-decui%40microsoft.com/
>
> drivers/pci/controller/pci-hyperv.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index 65d0dab25deb..53580899c859 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -1614,7 +1614,7 @@ static void hv_pci_compose_compl(void *context, struct pci_response *resp,
>
> static u32 hv_compose_msi_req_v1(
> struct pci_create_interrupt *int_pkt, struct cpumask *affinity,
> - u32 slot, u8 vector, u8 vector_count)
> + u32 slot, u8 vector, u16 vector_count)
> {
> int_pkt->message_type.type = PCI_CREATE_INTERRUPT_MESSAGE;
> int_pkt->wslot.slot = slot;
> @@ -1642,7 +1642,7 @@ static int hv_compose_msi_req_get_cpu(struct cpumask *affinity)
>
> static u32 hv_compose_msi_req_v2(
> struct pci_create_interrupt2 *int_pkt, struct cpumask *affinity,
> - u32 slot, u8 vector, u8 vector_count)
> + u32 slot, u8 vector, u16 vector_count)
> {
> int cpu;
>
> @@ -1661,7 +1661,7 @@ static u32 hv_compose_msi_req_v2(
>
> static u32 hv_compose_msi_req_v3(
> struct pci_create_interrupt3 *int_pkt, struct cpumask *affinity,
> - u32 slot, u32 vector, u8 vector_count)
> + u32 slot, u32 vector, u16 vector_count)
> {
> int cpu;
>
> @@ -1702,7 +1702,8 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
> struct tran_int_desc *int_desc;
> struct msi_desc *msi_desc;
> bool multi_msi;
> - u8 vector, vector_count;
> + u32 vector; /* Must be u32: see the struct hv_msi_desc3 */
Don't you need to cast this down to a u8 for v1 and v2?
Feels like this should be generating a compiler warning...
next prev parent reply other threads:[~2022-08-16 16:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-15 18:55 [PATCH] PCI: hv: Fix the definiton of vector in hv_compose_msi_msg() Dexuan Cui
2022-08-15 20:35 ` Bjorn Helgaas
2022-08-15 21:10 ` Dexuan Cui
2022-08-19 15:52 ` Wei Liu
2022-08-19 15:57 ` Dexuan Cui
2022-08-16 16:01 ` Jeffrey Hugo [this message]
2022-08-16 21:14 ` Dexuan Cui
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