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s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=3SD5Nhn2XpQ1H9kVLH/qfgLHEz7YapANneIn1r8dtW0=; b=WBLFmWv087FNYkkAcmwN5BcoHdaWkyuuxs9Vh8VjNP+hTZUnqyDdB+VQ9QkCfk5F6t K0U1ZSWKH9R06H7Ob9+T+8IgkQRUfP1+lbA4GHtK/biOfO9AjrL8vOvyiYShHrEPoala xv8sahVMVIXIEkU1lv4YanBXbiZ480tJFNXUrKm1dsCyfULOFcn0YeHq+98hcS53WMrc EoPC21/Twt8TTPahus3Nprw2HrRHW+36Z+0UlUu4OwyJ9beMbZ9EEec2PcReAcrPdobm rjpUKOXsPT89YMb58TIdjF7OryzjqKRfP0GoCz1BMKKLp/1XSaxvzxusTgmDpmqLyx9z 2Kwg== X-Gm-Message-State: AOAM5309A1c/c0eAOhru0yLvmErrV6zPywIxC/xV/qNrfB6rex/rlpEP 5Z1oYsPdp1ueqVQ3P3z1nXjAt7oUVrt0SrA8TFs= X-Google-Smtp-Source: ABdhPJye4nHQnxEram0LW7eTW/fhSjkhInwdT8WfdziuSjNH4F9ult6sspc1ZO66OShNisImaNAnVcNEu1U4CW17HQw= X-Received: by 2002:a5e:8707:: with SMTP id y7mr23060083ioj.49.1600331900788; Thu, 17 Sep 2020 01:38:20 -0700 (PDT) MIME-Version: 1.0 References: <20200911103459.10306-1-david@redhat.com> <20200916073041.10355-1-david@redhat.com> In-Reply-To: <20200916073041.10355-1-david@redhat.com> From: Pankaj Gupta Date: Thu, 17 Sep 2020 10:38:09 +0200 Message-ID: Subject: Re: [PATCH] kernel/resource: make iomem_resource implicit in release_mem_region_adjustable() To: David Hildenbrand Cc: LKML , virtualization@lists.linux-foundation.org, Linux MM , linux-hyperv@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, linux-nvdimm , linux-s390@vger.kernel.org, Andrew Morton , Wei Yang , Michal Hocko , Dan Williams , Jason Gunthorpe , Kees Cook , Ard Biesheuvel , Baoquan He Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: C7FBE100BEE24 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > "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 > Cc: Andrew Morton > Cc: Michal Hocko > Cc: Dan Williams > Cc: Jason Gunthorpe > Cc: Kees Cook > Cc: Ard Biesheuvel > Cc: Pankaj Gupta > Cc: Baoquan He > Cc: Wei Yang > Signed-off-by: David Hildenbrand > --- > > 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