[PATCH 10/25] memremap: pass a struct dev_pagemap to ->kill and ->cleanup

Christoph Hellwig
2019-06-26T12:27:57Z

Passing the actual typed structure leads to more understandable code
vs just passing the ref member.

Reported-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/dax/device.c | 12 ++++++------
drivers/nvdimm/pmem.c | 18 +++++++++---------
drivers/pci/p2pdma.c | 9 +++++----
include/linux/memremap.h | 4 ++--
kernel/memremap.c | 8 ++++----
mm/hmm.c | 10 +++++-----
tools/testing/nvdimm/test/iomap.c | 4 ++--
7 files changed, 33 insertions(+), 32 deletions(-)

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index f390083a64d7..b5257038c188 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -27,21 +27,21 @@ static void dev_dax_percpu_release(struct percpu_ref *ref)
complete(&dev_dax->cmp);
}

-static void dev_dax_percpu_exit(struct percpu_ref *ref)
+static void dev_dax_percpu_exit(struct dev_pagemap *pgmap)
{
- struct dev_dax *dev_dax = ref_to_dev_dax(ref);
+ struct dev_dax *dev_dax = container_of(pgmap, struct dev_dax, pgmap);

dev_dbg(&dev_dax->dev, "%s\n", __func__);
wait_for_completion(&dev_dax->cmp);
- percpu_ref_exit(ref);
+ percpu_ref_exit(pgmap->ref);
}

-static void dev_dax_percpu_kill(struct percpu_ref *ref)
+static void dev_dax_percpu_kill(struct dev_pagemap *pgmap)
{
- struct dev_dax *dev_dax = ref_to_dev_dax(ref);
+ struct dev_dax *dev_dax = container_of(pgmap, struct dev_dax, pgmap);

dev_dbg(&dev_dax->dev, "%s\n", __func__);
- percpu_ref_kill(ref);
+ percpu_ref_kill(pgmap->ref);
}

static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index c2449af2b388..9dac48359353 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -303,24 +303,24 @@ static const struct attribute_group *pmem_attribute_groups[] = {
NULL,
};

-static void pmem_pagemap_cleanup(struct percpu_ref *ref)
+static void pmem_pagemap_cleanup(struct dev_pagemap *pgmap)
{
- struct request_queue *q;
+ struct request_queue *q =
+ container_of(pgmap->ref, struct request_queue, q_usage_counter);

- q = container_of(ref, typeof(*q), q_usage_counter);
blk_cleanup_queue(q);
}

-static void pmem_release_queue(void *ref)
+static void pmem_release_queue(void *pgmap)
{
- pmem_pagemap_cleanup(ref);
+ pmem_pagemap_cleanup(pgmap);
}

-static void pmem_pagemap_kill(struct percpu_ref *ref)
+static void pmem_pagemap_kill(struct dev_pagemap *pgmap)
{
- struct request_queue *q;
+ struct request_queue *q =
+ container_of(pgmap->ref, struct request_queue, q_usage_counter);

- q = container_of(ref, typeof(*q), q_usage_counter);
blk_freeze_queue_start(q);
}

@@ -435,7 +435,7 @@ static int pmem_attach_disk(struct device *dev,
memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
} else {
if (devm_add_action_or_reset(dev, pmem_release_queue,
- &q->q_usage_counter))
+ &pmem->pgmap))
return -ENOMEM;
addr = devm_memremap(dev, pmem->phys_addr,
pmem->size, ARCH_MEMREMAP_PMEM);
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 13f0380a8c7f..ebd8ce3bba2e 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -90,14 +90,15 @@ static void pci_p2pdma_percpu_release(struct percpu_ref *ref)
complete(&p2p_pgmap->ref_done);
}

-static void pci_p2pdma_percpu_kill(struct percpu_ref *ref)
+static void pci_p2pdma_percpu_kill(struct dev_pagemap *pgmap)
{
- percpu_ref_kill(ref);
+ percpu_ref_kill(pgmap->ref);
}

-static void pci_p2pdma_percpu_cleanup(struct percpu_ref *ref)
+static void pci_p2pdma_percpu_cleanup(struct dev_pagemap *pgmap)
{
- struct p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(ref);
+ struct p2pdma_pagemap *p2p_pgmap =
+ container_of(pgmap, struct p2pdma_pagemap, pgmap);

wait_for_completion(&p2p_pgmap->ref_done);
percpu_ref_exit(&p2p_pgmap->ref);
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 919755f48c7e..b8666a0d8665 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -74,12 +74,12 @@ struct dev_pagemap_ops {
/*
* Transition the refcount in struct dev_pagemap to the dead state.
*/
- void (*kill)(struct percpu_ref *ref);
+ void (*kill)(struct dev_pagemap *pgmap);

/*
* Wait for refcount in struct dev_pagemap to be idle and reap it.
*/
- void (*cleanup)(struct percpu_ref *ref);
+ void (*cleanup)(struct dev_pagemap *pgmap);
};

/**
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 0824237ef979..00c1ceb60c19 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -92,10 +92,10 @@ static void devm_memremap_pages_release(void *data)
unsigned long pfn;
int nid;

- pgmap->ops->kill(pgmap->ref);
+ pgmap->ops->kill(pgmap);
for_each_device_pfn(pfn, pgmap)
put_page(pfn_to_page(pfn));
- pgmap->ops->cleanup(pgmap->ref);
+ pgmap->ops->cleanup(pgmap);

/* pages are dead and unused, undo the arch mapping */
align_start = res->start & ~(SECTION_SIZE - 1);
@@ -294,8 +294,8 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
err_pfn_remap:
pgmap_array_delete(res);
err_array:
- pgmap->ops->kill(pgmap->ref);
- pgmap->ops->cleanup(pgmap->ref);
+ pgmap->ops->kill(pgmap);
+ pgmap->ops->cleanup(pgmap);
return ERR_PTR(error);
}
EXPORT_SYMBOL_GPL(devm_memremap_pages);
diff --git a/mm/hmm.c b/mm/hmm.c
index 583a02a16872..987793fba923 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -1352,18 +1352,18 @@ static void hmm_devmem_ref_release(struct percpu_ref *ref)
complete(&devmem->completion);
}

-static void hmm_devmem_ref_exit(struct percpu_ref *ref)
+static void hmm_devmem_ref_exit(struct dev_pagemap *pgmap)
{
struct hmm_devmem *devmem;

- devmem = container_of(ref, struct hmm_devmem, ref);
+ devmem = container_of(pgmap, struct hmm_devmem, pagemap);
wait_for_completion(&devmem->completion);
- percpu_ref_exit(ref);
+ percpu_ref_exit(pgmap->ref);
}

-static void hmm_devmem_ref_kill(struct percpu_ref *ref)
+static void hmm_devmem_ref_kill(struct dev_pagemap *pgmap)
{
- percpu_ref_kill(ref);
+ percpu_ref_kill(pgmap->ref);
}

static vm_fault_t hmm_devmem_fault(struct vm_area_struct *vma,
diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
index cf3f064a697d..82f901569e06 100644
--- a/tools/testing/nvdimm/test/iomap.c
+++ b/tools/testing/nvdimm/test/iomap.c
@@ -102,8 +102,8 @@ static void nfit_test_kill(void *_pgmap)

WARN_ON(!pgmap || !pgmap->ref || !pgmap->ops || !pgmap->ops->kill ||
!pgmap->ops->cleanup);
- pgmap->ops->kill(pgmap->ref);
- pgmap->ops->cleanup(pgmap->ref);
+ pgmap->ops->kill(pgmap);
+ pgmap->ops->cleanup(pgmap);
}

void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
--
2.20.1