From: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
To: David Hildenbrand <david@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
virtualization@lists.linux-foundation.org,
Linux MM <linux-mm@kvack.org>,
linux-hyperv@vger.kernel.org, xen-devel@lists.xenproject.org,
linux-acpi@vger.kernel.org,
linux-nvdimm <linux-nvdimm@lists.01.org>,
linux-s390@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Wei Yang <richard.weiyang@linux.alibaba.com>,
Michal Hocko <mhocko@suse.com>, Jason Gunthorpe <jgg@ziepe.ca>,
Kees Cook <keescook@chromium.org>,
Ard Biesheuvel <ardb@kernel.org>, Baoquan He <bhe@redhat.com>
Subject: Re: [PATCH] kernel/resource: make iomem_resource implicit in release_mem_region_adjustable()
Date: Thu, 17 Sep 2020 10:38:09 +0200 [thread overview]
Message-ID: <CAM9Jb+iAiBFoXL1eO0HHyhDmdiXMh0Oihnr8dMtPu+zAdC=2WQ@mail.gmail.com> (raw)
In-Reply-To: <20200916073041.10355-1-david@redhat.com>
> "mem" in the name already indicates the root, similar to
> release_mem_region() and devm_request_mem_region(). Make it implicit.
> The only single caller always passes iomem_resource, other parents are
> not applicable.
>
> Suggested-by: Wei Yang <richard.weiyang@linux.alibaba.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Ard Biesheuvel <ardb@kernel.org>
> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
> Cc: Baoquan He <bhe@redhat.com>
> Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>
> Based on next-20200915. Follow up on
> "[PATCH v4 0/8] selective merging of system ram resources" [1]
> That's in next-20200915. As noted during review of v2 by Wei [2].
>
> [1] https://lkml.kernel.org/r/20200911103459.10306-1-david@redhat.com
> [2] https://lkml.kernel.org/r/20200915021012.GC2007@L-31X9LVDL-1304.local
>
> ---
> include/linux/ioport.h | 3 +--
> kernel/resource.c | 5 ++---
> mm/memory_hotplug.c | 2 +-
> 3 files changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/include/linux/ioport.h b/include/linux/ioport.h
> index 7e61389dcb01..5135d4b86cd6 100644
> --- a/include/linux/ioport.h
> +++ b/include/linux/ioport.h
> @@ -251,8 +251,7 @@ extern struct resource * __request_region(struct resource *,
> extern void __release_region(struct resource *, resource_size_t,
> resource_size_t);
> #ifdef CONFIG_MEMORY_HOTREMOVE
> -extern void release_mem_region_adjustable(struct resource *, resource_size_t,
> - resource_size_t);
> +extern void release_mem_region_adjustable(resource_size_t, resource_size_t);
> #endif
> #ifdef CONFIG_MEMORY_HOTPLUG
> extern void merge_system_ram_resource(struct resource *res);
> diff --git a/kernel/resource.c b/kernel/resource.c
> index 7a91b935f4c2..ca2a666e4317 100644
> --- a/kernel/resource.c
> +++ b/kernel/resource.c
> @@ -1240,7 +1240,6 @@ EXPORT_SYMBOL(__release_region);
> #ifdef CONFIG_MEMORY_HOTREMOVE
> /**
> * release_mem_region_adjustable - release a previously reserved memory region
> - * @parent: parent resource descriptor
> * @start: resource start address
> * @size: resource region size
> *
> @@ -1258,9 +1257,9 @@ EXPORT_SYMBOL(__release_region);
> * assumes that all children remain in the lower address entry for
> * simplicity. Enhance this logic when necessary.
> */
> -void release_mem_region_adjustable(struct resource *parent,
> - resource_size_t start, resource_size_t size)
> +void release_mem_region_adjustable(resource_size_t start, resource_size_t size)
> {
> + struct resource *parent = &iomem_resource;
> struct resource *new_res = NULL;
> bool alloc_nofail = false;
> struct resource **p;
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 553c718226b3..7c5e4744ac51 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1764,7 +1764,7 @@ static int __ref try_remove_memory(int nid, u64 start, u64 size)
> memblock_remove(start, size);
> }
>
> - release_mem_region_adjustable(&iomem_resource, start, size);
> + release_mem_region_adjustable(start, size);
>
> try_offline_node(nid);
>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
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prev parent reply other threads:[~2020-09-17 8:38 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-11 10:34 [PATCH v4 0/8] selective merging of system ram resources David Hildenbrand
2020-09-11 10:34 ` [PATCH v4 1/8] kernel/resource: make release_mem_region_adjustable() never fail David Hildenbrand
2020-09-22 6:07 ` [PATCH] kernel/resource: Fix use of ternary condition in release_mem_region_adjustable Nathan Chancellor
2020-09-22 6:22 ` David Hildenbrand
2020-10-09 9:24 ` Wei Yang
2020-09-11 10:34 ` [PATCH v4 2/8] kernel/resource: move and rename IORESOURCE_MEM_DRIVER_MANAGED David Hildenbrand
2020-09-11 10:34 ` [PATCH v4 3/8] mm/memory_hotplug: guard more declarations by CONFIG_MEMORY_HOTPLUG David Hildenbrand
2020-09-11 10:34 ` [PATCH v4 4/8] mm/memory_hotplug: prepare passing flags to add_memory() and friends David Hildenbrand
2020-09-11 10:34 ` [PATCH v4 5/8] mm/memory_hotplug: MEMHP_MERGE_RESOURCE to specify merging of System RAM resources David Hildenbrand
2020-09-15 2:43 ` Wei Yang
2020-09-15 7:25 ` David Hildenbrand
2020-09-16 12:51 ` Wei Yang
2020-09-11 10:34 ` [PATCH v4 6/8] virtio-mem: try to merge system ram resources David Hildenbrand
2020-09-16 12:52 ` Wei Yang
2020-09-11 10:34 ` [PATCH v4 7/8] xen/balloon: " David Hildenbrand
2020-09-16 12:52 ` Wei Yang
2020-09-11 10:34 ` [PATCH v4 8/8] hv_balloon: " David Hildenbrand
2020-09-16 12:52 ` Wei Yang
2020-09-16 7:30 ` [PATCH] kernel/resource: make iomem_resource implicit in release_mem_region_adjustable() David Hildenbrand
2020-09-16 10:02 ` Wei Yang
2020-09-16 10:03 ` David Hildenbrand
2020-09-16 12:10 ` Wei Yang
2020-09-16 12:16 ` David Hildenbrand
2020-09-16 12:40 ` Wei Yang
2020-09-17 8:38 ` Pankaj Gupta [this message]
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