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Message-ID: <20241027205445.239108-1-linux@treblig.org>
Date: Sun, 27 Oct 2024 20:54:45 +0000
From: linux@...blig.org
To: andersson@...nel.org,
baolin.wang@...ux.alibaba.com,
peterz@...radead.org,
mingo@...hat.com,
will@...nel.org
Cc: longman@...hat.com,
boqun.feng@...il.com,
corbet@....net,
linux-remoteproc@...r.kernel.org,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
"Dr. David Alan Gilbert" <linux@...blig.org>
Subject: [PATCH] hwspinlock: Remove unused (devm_)hwspin_lock_request
From: "Dr. David Alan Gilbert" <linux@...blig.org>
devm_hwspin_lock_request() was added by 2018's
commit 4f1acd758b08 ("hwspinlock: Add devm_xxx() APIs to request/free
hwlock") however, it's never been used, everyone uses the
devm_hwspin_lock_request_specific() call instead.
Remove it.
Similarly, the none-devm variant isn't used.
Remove it, and the referring documentation.
Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
---
Documentation/locking/hwspinlock.rst | 46 +----------------
drivers/hwspinlock/hwspinlock_core.c | 77 ----------------------------
include/linux/hwspinlock.h | 12 -----
3 files changed, 1 insertion(+), 134 deletions(-)
diff --git a/Documentation/locking/hwspinlock.rst b/Documentation/locking/hwspinlock.rst
index 2ffaa3cbd63f..d482422d7a38 100644
--- a/Documentation/locking/hwspinlock.rst
+++ b/Documentation/locking/hwspinlock.rst
@@ -38,17 +38,6 @@ independent, drivers.
User API
========
-::
-
- struct hwspinlock *hwspin_lock_request(void);
-
-Dynamically assign an hwspinlock and return its address, or NULL
-in case an unused hwspinlock isn't available. Users of this
-API will usually want to communicate the lock's id to the remote core
-before it can be used to achieve synchronization.
-
-Should be called from a process context (might sleep).
-
::
struct hwspinlock *hwspin_lock_request_specific(unsigned int id);
@@ -331,40 +320,7 @@ Typical usage
#include <linux/hwspinlock.h>
#include <linux/err.h>
- int hwspinlock_example1(void)
- {
- struct hwspinlock *hwlock;
- int ret;
-
- /* dynamically assign a hwspinlock */
- hwlock = hwspin_lock_request();
- if (!hwlock)
- ...
-
- id = hwspin_lock_get_id(hwlock);
- /* probably need to communicate id to a remote processor now */
-
- /* take the lock, spin for 1 sec if it's already taken */
- ret = hwspin_lock_timeout(hwlock, 1000);
- if (ret)
- ...
-
- /*
- * we took the lock, do our thing now, but do NOT sleep
- */
-
- /* release the lock */
- hwspin_unlock(hwlock);
-
- /* free the lock */
- ret = hwspin_lock_free(hwlock);
- if (ret)
- ...
-
- return ret;
- }
-
- int hwspinlock_example2(void)
+ int hwspinlock_example(void)
{
struct hwspinlock *hwlock;
int ret;
diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index 6505261e6068..f000432ce21d 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -726,49 +726,6 @@ int hwspin_lock_get_id(struct hwspinlock *hwlock)
}
EXPORT_SYMBOL_GPL(hwspin_lock_get_id);
-/**
- * hwspin_lock_request() - request an hwspinlock
- *
- * This function should be called by users of the hwspinlock device,
- * in order to dynamically assign them an unused hwspinlock.
- * Usually the user of this lock will then have to communicate the lock's id
- * to the remote core before it can be used for synchronization (to get the
- * id of a given hwlock, use hwspin_lock_get_id()).
- *
- * Should be called from a process context (might sleep)
- *
- * Returns: the address of the assigned hwspinlock, or %NULL on error
- */
-struct hwspinlock *hwspin_lock_request(void)
-{
- struct hwspinlock *hwlock;
- int ret;
-
- mutex_lock(&hwspinlock_tree_lock);
-
- /* look for an unused lock */
- ret = radix_tree_gang_lookup_tag(&hwspinlock_tree, (void **)&hwlock,
- 0, 1, HWSPINLOCK_UNUSED);
- if (ret == 0) {
- pr_warn("a free hwspinlock is not available\n");
- hwlock = NULL;
- goto out;
- }
-
- /* sanity check that should never fail */
- WARN_ON(ret > 1);
-
- /* mark as used and power up */
- ret = __hwspin_lock_request(hwlock);
- if (ret < 0)
- hwlock = NULL;
-
-out:
- mutex_unlock(&hwspinlock_tree_lock);
- return hwlock;
-}
-EXPORT_SYMBOL_GPL(hwspin_lock_request);
-
/**
* hwspin_lock_request_specific() - request for a specific hwspinlock
* @id: index of the specific hwspinlock that is requested
@@ -912,40 +869,6 @@ int devm_hwspin_lock_free(struct device *dev, struct hwspinlock *hwlock)
}
EXPORT_SYMBOL_GPL(devm_hwspin_lock_free);
-/**
- * devm_hwspin_lock_request() - request an hwspinlock for a managed device
- * @dev: the device to request an hwspinlock
- *
- * This function should be called by users of the hwspinlock device,
- * in order to dynamically assign them an unused hwspinlock.
- * Usually the user of this lock will then have to communicate the lock's id
- * to the remote core before it can be used for synchronization (to get the
- * id of a given hwlock, use hwspin_lock_get_id()).
- *
- * Should be called from a process context (might sleep)
- *
- * Returns: the address of the assigned hwspinlock, or %NULL on error
- */
-struct hwspinlock *devm_hwspin_lock_request(struct device *dev)
-{
- struct hwspinlock **ptr, *hwlock;
-
- ptr = devres_alloc(devm_hwspin_lock_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
- return NULL;
-
- hwlock = hwspin_lock_request();
- if (hwlock) {
- *ptr = hwlock;
- devres_add(dev, ptr);
- } else {
- devres_free(ptr);
- }
-
- return hwlock;
-}
-EXPORT_SYMBOL_GPL(devm_hwspin_lock_request);
-
/**
* devm_hwspin_lock_request_specific() - request for a specific hwspinlock for
* a managed device
diff --git a/include/linux/hwspinlock.h b/include/linux/hwspinlock.h
index f0231dbc4777..2f32d768dfd9 100644
--- a/include/linux/hwspinlock.h
+++ b/include/linux/hwspinlock.h
@@ -58,7 +58,6 @@ struct hwspinlock_pdata {
int hwspin_lock_register(struct hwspinlock_device *bank, struct device *dev,
const struct hwspinlock_ops *ops, int base_id, int num_locks);
int hwspin_lock_unregister(struct hwspinlock_device *bank);
-struct hwspinlock *hwspin_lock_request(void);
struct hwspinlock *hwspin_lock_request_specific(unsigned int id);
int hwspin_lock_free(struct hwspinlock *hwlock);
int of_hwspin_lock_get_id(struct device_node *np, int index);
@@ -70,7 +69,6 @@ void __hwspin_unlock(struct hwspinlock *, int, unsigned long *);
int of_hwspin_lock_get_id_byname(struct device_node *np, const char *name);
int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id);
int devm_hwspin_lock_free(struct device *dev, struct hwspinlock *hwlock);
-struct hwspinlock *devm_hwspin_lock_request(struct device *dev);
struct hwspinlock *devm_hwspin_lock_request_specific(struct device *dev,
unsigned int id);
int devm_hwspin_lock_unregister(struct device *dev,
@@ -95,11 +93,6 @@ int devm_hwspin_lock_register(struct device *dev,
* Note: ERR_PTR(-ENODEV) will still be considered a success for NULL-checking
* users. Others, which care, can still check this with IS_ERR.
*/
-static inline struct hwspinlock *hwspin_lock_request(void)
-{
- return ERR_PTR(-ENODEV);
-}
-
static inline struct hwspinlock *hwspin_lock_request_specific(unsigned int id)
{
return ERR_PTR(-ENODEV);
@@ -155,11 +148,6 @@ int devm_hwspin_lock_free(struct device *dev, struct hwspinlock *hwlock)
return 0;
}
-static inline struct hwspinlock *devm_hwspin_lock_request(struct device *dev)
-{
- return ERR_PTR(-ENODEV);
-}
-
static inline
struct hwspinlock *devm_hwspin_lock_request_specific(struct device *dev,
unsigned int id)
--
2.47.0
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