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Drivers: hv: vmbus: Remove the target_vp field from the vmbus_channel struct

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The field is read only in __vmbus_open() and it is already stored twice
(after a call to hv_cpu_number_to_vp_number()) in target_cpu_store() and
init_vp_index(); there is no need to "cache" its value in the channel
data structure.

Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20200617164642.37393-2-parri.andrea@gmail.com
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Andrea Parri (Microsoft) 2020-06-17 18:46:35 +02:00 committed by Wei Liu
parent b3a9e3b962
commit 5bf7468211
4 changed files with 9 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/hv/channel.c
View file

@ -18,6 +18,7 @@
#include <linux/uio.h>
#include <linux/interrupt.h>
#include <asm/page.h>
#include <asm/mshyperv.h>
#include "hyperv_vmbus.h"
@ -176,7 +177,7 @@ static int __vmbus_open(struct vmbus_channel *newchannel,
open_msg->child_relid = newchannel->offermsg.child_relid;
open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle;
open_msg->downstream_ringbuffer_pageoffset = newchannel->ringbuffer_send_offset;
open_msg->target_vp = newchannel->target_vp;
open_msg->target_vp = hv_cpu_number_to_vp_number(newchannel->target_cpu);
if (userdatalen)
memcpy(open_msg->userdata, userdata, userdatalen);

3
drivers/hv/channel_mgmt.c
View file

@ -704,8 +704,6 @@ static void init_vp_index(struct vmbus_channel *channel)
*/
channel->numa_node = cpu_to_node(VMBUS_CONNECT_CPU);
channel->target_cpu = VMBUS_CONNECT_CPU;
channel->target_vp =
hv_cpu_number_to_vp_number(VMBUS_CONNECT_CPU);
if (perf_chn)
hv_set_alloced_cpu(VMBUS_CONNECT_CPU);
return;
@ -739,7 +737,6 @@ static void init_vp_index(struct vmbus_channel *channel)
cpumask_set_cpu(target_cpu, alloced_mask);
channel->target_cpu = target_cpu;
channel->target_vp = hv_cpu_number_to_vp_number(target_cpu);
free_cpumask_var(available_mask);
}

2
drivers/hv/vmbus_drv.c
View file

@ -23,7 +23,6 @@
#include <linux/cpu.h>
#include <linux/sched/task_stack.h>
#include <asm/mshyperv.h>
#include <linux/delay.h>
#include <linux/notifier.h>
#include <linux/ptrace.h>
@ -1779,7 +1778,6 @@ static ssize_t target_cpu_store(struct vmbus_channel *channel,
*/
channel->target_cpu = target_cpu;
channel->target_vp = hv_cpu_number_to_vp_number(target_cpu);
channel->numa_node = cpu_to_node(target_cpu);
/* See init_vp_index(). */

15
include/linux/hyperv.h
View file

@ -803,15 +803,14 @@ struct vmbus_channel {
u64 sig_event;
/*
* Starting with win8, this field will be used to specify
* the target virtual processor on which to deliver the interrupt for
* the host to guest communication.
* Prior to win8, incoming channel interrupts would only
* be delivered on cpu 0. Setting this value to 0 would
* preserve the earlier behavior.
* Starting with win8, this field will be used to specify the
* target CPU on which to deliver the interrupt for the host
* to guest communication.
*
* Prior to win8, incoming channel interrupts would only be
* delivered on CPU 0. Setting this value to 0 would preserve
* the earlier behavior.
*/
u32 target_vp;
/* The corresponding CPUID in the guest */
u32 target_cpu;
int numa_node;
/*