| Message ID | 20190613094326.24093-9-hch@lst.de (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [01/22] mm: remove the unused ARCH_HAS_HMM_DEVICE Kconfig option | expand |
On Thu, Jun 13, 2019 at 11:43:11AM +0200, Christoph Hellwig wrote: > Passing the actual typed structure leads to more understandable code > vs the actual references. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > drivers/dax/device.c | 7 +++---- > drivers/nvdimm/pmem.c | 6 +++--- > drivers/pci/p2pdma.c | 6 +++--- > include/linux/memremap.h | 2 +- > kernel/memremap.c | 4 ++-- > mm/hmm.c | 4 ++-- > tools/testing/nvdimm/test/iomap.c | 6 ++---- > 7 files changed, 16 insertions(+), 19 deletions(-) > > diff --git a/drivers/dax/device.c b/drivers/dax/device.c > index 4adab774dade..e23fa1bd8c97 100644 > +++ b/drivers/dax/device.c > @@ -37,13 +37,12 @@ static void dev_dax_percpu_exit(void *data) > percpu_ref_exit(ref); > } > > -static void dev_dax_percpu_kill(struct percpu_ref *data) > +static void dev_dax_percpu_kill(struct dev_pagemap *pgmap) > { Looks like it was always like this, but I also can't see a reason to use the percpu as a handle for a dev_pagemap callback. Reviewed-by: Jason Gunthorpe <jgg@mellanox.com> Jason
On 2019-06-13 3:43 a.m., Christoph Hellwig wrote: > Passing the actual typed structure leads to more understandable code > vs the actual references. Ha, ok, I originally suggested this to Dan when he introduced the callback[1]. Reviewed-by: Logan Gunthorpe <logang@deltatee.com> Logan [1] https://lore.kernel.org/lkml/8f0cae82-130f-8a64-cfbd-fda5fd76bb79@deltatee.com/T/#u
On Thu, Jun 13, 2019 at 1:12 PM Logan Gunthorpe <logang@deltatee.com> wrote: > > > > On 2019-06-13 3:43 a.m., Christoph Hellwig wrote: > > Passing the actual typed structure leads to more understandable code > > vs the actual references. > > Ha, ok, I originally suggested this to Dan when he introduced the > callback[1]. > > Reviewed-by: Logan Gunthorpe <logang@deltatee.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reported-by: Logan Gunthorpe <logang@deltatee.com> :) > > Logan > > [1] > https://lore.kernel.org/lkml/8f0cae82-130f-8a64-cfbd-fda5fd76bb79@deltatee.com/T/#u >
diff --git a/drivers/dax/device.c b/drivers/dax/device.c index 4adab774dade..e23fa1bd8c97 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -37,13 +37,12 @@ static void dev_dax_percpu_exit(void *data) percpu_ref_exit(ref); } -static void dev_dax_percpu_kill(struct percpu_ref *data) +static void dev_dax_percpu_kill(struct dev_pagemap *pgmap) { - struct percpu_ref *ref = data; - 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 4efbf184ea68..b9638c6553a1 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -316,11 +316,11 @@ static void pmem_release_queue(void *q) blk_cleanup_queue(q); } -static void pmem_kill(struct percpu_ref *ref) +static void pmem_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); } diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 6e76380f5b97..3bcacc9222c6 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -82,7 +82,7 @@ static void pci_p2pdma_percpu_release(struct percpu_ref *ref) complete_all(&p2p->devmap_ref_done); } -static void pci_p2pdma_percpu_kill(struct percpu_ref *ref) +static void pci_p2pdma_percpu_kill(struct dev_pagemap *pgmap) { /* * pci_p2pdma_add_resource() may be called multiple times @@ -90,10 +90,10 @@ static void pci_p2pdma_percpu_kill(struct percpu_ref *ref) * times. We only want the first action to actually kill the * percpu_ref. */ - if (percpu_ref_is_dying(ref)) + if (percpu_ref_is_dying(pgmap->ref)) return; - percpu_ref_kill(ref); + percpu_ref_kill(pgmap->ref); } static void pci_p2pdma_release(void *data) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 5f7f40875b35..96a3a6d564ad 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -74,7 +74,7 @@ struct dev_pagemap_ops { /* * Transition the percpu_ref in struct dev_pagemap to the dead state. */ - void (*kill)(struct percpu_ref *ref); + void (*kill)(struct dev_pagemap *pgmap); }; /** diff --git a/kernel/memremap.c b/kernel/memremap.c index e23286ce0ec4..94b830b6eca5 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -92,7 +92,7 @@ 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)); @@ -266,7 +266,7 @@ 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->kill(pgmap); return ERR_PTR(error); } EXPORT_SYMBOL_GPL(devm_memremap_pages); diff --git a/mm/hmm.c b/mm/hmm.c index 2501ac6045d0..c76a1b5defda 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -1325,9 +1325,9 @@ static void hmm_devmem_ref_exit(void *data) percpu_ref_exit(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 7f5ece9b5011..ee07c4de2b35 100644 --- a/tools/testing/nvdimm/test/iomap.c +++ b/tools/testing/nvdimm/test/iomap.c @@ -104,11 +104,9 @@ void *__wrap_devm_memremap(struct device *dev, resource_size_t offset, } EXPORT_SYMBOL(__wrap_devm_memremap); -static void nfit_test_kill(void *_pgmap) +static void nfit_test_kill(void *pgmap) { - struct dev_pagemap *pgmap = _pgmap; - - pgmap->ops->kill(pgmap->ref); + pgmap->ops->kill(pgmap); } void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
Passing the actual typed structure leads to more understandable code vs the actual references. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/dax/device.c | 7 +++---- drivers/nvdimm/pmem.c | 6 +++--- drivers/pci/p2pdma.c | 6 +++--- include/linux/memremap.h | 2 +- kernel/memremap.c | 4 ++-- mm/hmm.c | 4 ++-- tools/testing/nvdimm/test/iomap.c | 6 ++---- 7 files changed, 16 insertions(+), 19 deletions(-)