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- From f7792176d939e79b4f525114a95d0fd8266bef8e Mon Sep 17 00:00:00 2001
- From: Madalin Bucur <madalin.bucur@freescale.com>
- Date: Wed, 19 Nov 2014 13:06:54 +0200
- Subject: [PATCH 18/70] devres: add devm_alloc_percpu()
- Introduce managed counterparts for alloc_percpu() and free_percpu().
- Add devm_alloc_percpu() and devm_free_percpu() into the managed
- interfaces list.
- Signed-off-by: Madalin Bucur <madalin.bucur@freescale.com>
- Change-Id: I93546348e7b0e1974fda8b6c7a3b3710ce45b724
- Reviewed-on: http://git.am.freescale.net:8181/24140
- Reviewed-by: Madalin-Cristian Bucur <madalin.bucur@freescale.com>
- Tested-by: Madalin-Cristian Bucur <madalin.bucur@freescale.com>
- Conflicts:
- Documentation/driver-model/devres.txt
- drivers/base/devres.c
- Conflicts:
- drivers/base/devres.c
- ---
- Documentation/driver-model/devres.txt | 4 +++
- drivers/base/devres.c | 63 +++++++++++++++++++++++++++++++++
- include/linux/device.h | 19 ++++++++++
- 3 files changed, 86 insertions(+)
- --- a/Documentation/driver-model/devres.txt
- +++ b/Documentation/driver-model/devres.txt
- @@ -321,6 +321,10 @@ PHY
- devm_usb_get_phy()
- devm_usb_put_phy()
-
- +PER-CPU MEM
- + devm_alloc_percpu()
- + devm_free_percpu()
- +
- PINCTRL
- devm_pinctrl_get()
- devm_pinctrl_put()
- --- a/drivers/base/devres.c
- +++ b/drivers/base/devres.c
- @@ -985,3 +985,66 @@ void devm_free_pages(struct device *dev,
- &devres));
- }
- EXPORT_SYMBOL_GPL(devm_free_pages);
- +
- +static void devm_percpu_release(struct device *dev, void *pdata)
- +{
- + void __percpu *p;
- +
- + p = *(void __percpu **)pdata;
- + free_percpu(p);
- +}
- +
- +static int devm_percpu_match(struct device *dev, void *data, void *p)
- +{
- + struct devres *devr = container_of(data, struct devres, data);
- +
- + return *(void **)devr->data == p;
- +}
- +
- +/**
- + * __devm_alloc_percpu - Resource-managed alloc_percpu
- + * @dev: Device to allocate per-cpu memory for
- + * @size: Size of per-cpu memory to allocate
- + * @align: Alignement of per-cpu memory to allocate
- + *
- + * Managed alloc_percpu. Per-cpu memory allocated with this function is
- + * automatically freed on driver detach.
- + *
- + * RETURNS:
- + * Pointer to allocated memory on success, NULL on failure.
- + */
- +void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
- + size_t align)
- +{
- + void *p;
- + void __percpu *pcpu;
- +
- + pcpu = __alloc_percpu(size, align);
- + if (!pcpu)
- + return NULL;
- +
- + p = devres_alloc(devm_percpu_release, sizeof(void *), GFP_KERNEL);
- + if (!p)
- + return NULL;
- +
- + *(void __percpu **)p = pcpu;
- +
- + devres_add(dev, p);
- +
- + return pcpu;
- +}
- +EXPORT_SYMBOL_GPL(__devm_alloc_percpu);
- +
- +/**
- + * devm_free_percpu - Resource-managed free_percpu
- + * @dev: Device this memory belongs to
- + * @pdata: Per-cpu memory to free
- + *
- + * Free memory allocated with devm_alloc_percpu().
- + */
- +void devm_free_percpu(struct device *dev, void __percpu *pdata)
- +{
- + WARN_ON(devres_destroy(dev, devm_percpu_release, devm_percpu_match,
- + (void *)pdata));
- +}
- +EXPORT_SYMBOL_GPL(devm_free_percpu);
- --- a/include/linux/device.h
- +++ b/include/linux/device.h
- @@ -683,6 +683,25 @@ void __iomem *devm_ioremap_resource(stru
- int devm_add_action(struct device *dev, void (*action)(void *), void *data);
- void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
-
- +/**
- + * devm_alloc_percpu - Resource-managed alloc_percpu
- + * @dev: Device to allocate per-cpu memory for
- + * @type: Type to allocate per-cpu memory for
- + *
- + * Managed alloc_percpu. Per-cpu memory allocated with this function is
- + * automatically freed on driver detach.
- + *
- + * RETURNS:
- + * Pointer to allocated memory on success, NULL on failure.
- + */
- +#define devm_alloc_percpu(dev, type) \
- + (typeof(type) __percpu *)__devm_alloc_percpu(dev, sizeof(type), \
- + __alignof__(type))
- +
- +void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
- + size_t align);
- +void devm_free_percpu(struct device *dev, void __percpu *pdata);
- +
- struct device_dma_parameters {
- /*
- * a low level driver may set these to teach IOMMU code about
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