2023-06-22 20:59:18

by Kameron Carr

Subject: [PATCH] Drivers: hv: Change hv_free_hyperv_page() to take void * argument

Currently hv_free_hyperv_page() takes an unsigned long argument, which
is inconsistent with the void * return value from the corresponding
hv_alloc_hyperv_page() function and variants. This creates unnecessary
extra casting.

Change the hv_free_hyperv_page() argument type to void *.
Also remove redundant casts from invocations of
hv_alloc_hyperv_page() and variants.
---
drivers/hv/connection.c | 13 ++++++-------
drivers/hv/hv_common.c | 10 +++++-----
include/asm-generic/mshyperv.h | 2 +-
3 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 5978e9d..ebf15f3 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -209,8 +209,7 @@ int vmbus_connect(void)
* Setup the vmbus event connection for channel interrupt
* abstraction stuff
*/
- vmbus_connection.int_page =
- (void *)hv_alloc_hyperv_zeroed_page();
+ vmbus_connection.int_page = hv_alloc_hyperv_zeroed_page();
if (vmbus_connection.int_page == NULL) {
ret = -ENOMEM;
goto cleanup;
@@ -225,8 +224,8 @@ int vmbus_connect(void)
* Setup the monitor notification facility. The 1st page for
* parent->child and the 2nd page for child->parent
*/
- vmbus_connection.monitor_pages[0] = (void *)hv_alloc_hyperv_page();
- vmbus_connection.monitor_pages[1] = (void *)hv_alloc_hyperv_page();
+ vmbus_connection.monitor_pages[0] = hv_alloc_hyperv_page();
+ vmbus_connection.monitor_pages[1] = hv_alloc_hyperv_page();
if ((vmbus_connection.monitor_pages[0] == NULL) ||
(vmbus_connection.monitor_pages[1] == NULL)) {
ret = -ENOMEM;
@@ -333,15 +332,15 @@ void vmbus_disconnect(void)
destroy_workqueue(vmbus_connection.work_queue);

if (vmbus_connection.int_page) {
- hv_free_hyperv_page((unsigned long)vmbus_connection.int_page);
+ hv_free_hyperv_page(vmbus_connection.int_page);
vmbus_connection.int_page = NULL;
}

set_memory_encrypted((unsigned long)vmbus_connection.monitor_pages[0], 1);
set_memory_encrypted((unsigned long)vmbus_connection.monitor_pages[1], 1);

- hv_free_hyperv_page((unsigned long)vmbus_connection.monitor_pages[0]);
- hv_free_hyperv_page((unsigned long)vmbus_connection.monitor_pages[1]);
+ hv_free_hyperv_page(vmbus_connection.monitor_pages[0]);
+ hv_free_hyperv_page(vmbus_connection.monitor_pages[1]);
vmbus_connection.monitor_pages[0] = NULL;
vmbus_connection.monitor_pages[1] = NULL;
}
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 542a1d5..6a2258f 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -115,12 +115,12 @@ void *hv_alloc_hyperv_zeroed_page(void)
}
EXPORT_SYMBOL_GPL(hv_alloc_hyperv_zeroed_page);

-void hv_free_hyperv_page(unsigned long addr)
+void hv_free_hyperv_page(void *addr)
{
if (PAGE_SIZE == HV_HYP_PAGE_SIZE)
- free_page(addr);
+ free_page((unsigned long)addr);
else
- kfree((void *)addr);
+ kfree(addr);
}
EXPORT_SYMBOL_GPL(hv_free_hyperv_page);

@@ -253,7 +253,7 @@ static void hv_kmsg_dump_unregister(void)
atomic_notifier_chain_unregister(&panic_notifier_list,
&hyperv_panic_report_block);

- hv_free_hyperv_page((unsigned long)hv_panic_page);
+ hv_free_hyperv_page(hv_panic_page);
hv_panic_page = NULL;
}

@@ -270,7 +270,7 @@ static void hv_kmsg_dump_register(void)
ret = kmsg_dump_register(&hv_kmsg_dumper);
if (ret) {
pr_err("Hyper-V: kmsg dump register error 0x%x\n", ret);
- hv_free_hyperv_page((unsigned long)hv_panic_page);
+ hv_free_hyperv_page(hv_panic_page);
hv_panic_page = NULL;
}
}
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 402a8c1..a8f4b65 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -190,7 +190,7 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)

void *hv_alloc_hyperv_page(void);
void *hv_alloc_hyperv_zeroed_page(void);
-void hv_free_hyperv_page(unsigned long addr);
+void hv_free_hyperv_page(void *addr);

/**
* hv_cpu_number_to_vp_number() - Map CPU to VP.
--
1.8.3.1

2023-06-23 03:40:57

by Dexuan Cui

Subject: RE: [PATCH] Drivers: hv: Change hv_free_hyperv_page() to take void * argument

> From: Kameron Carr <[email protected]>
> Sent: Thursday, June 22, 2023 1:07 PM
> ...
> Currently hv_free_hyperv_page() takes an unsigned long argument, which
> is inconsistent with the void * return value from the corresponding
> hv_alloc_hyperv_page() function and variants. This creates unnecessary
> extra casting.
>
> Change the hv_free_hyperv_page() argument type to void *.
> Also remove redundant casts from invocations of
> hv_alloc_hyperv_page() and variants.
> ---

Hi Kameron, you forgot to add your Signed-off-by :-)
Otherwise, it looks good to me.

Reviewed-by: Dexuan Cui <[email protected]>