linux-kernel - Re: [PATCH v3 08/11] mm/memory_hotplug: Drop MHP_MEMBLOCK

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Date:   Tue, 4 Jun 2019 21:47:53 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, akpm@...ux-foundation.org,
        Dan Williams <dan.j.williams@...el.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, Qian Cai <cai@....pw>,
        Arun KS <arunks@...eaurora.org>,
        Mathieu Malaterre <malat@...ian.org>
Subject: Re: [PATCH v3 08/11] mm/memory_hotplug: Drop MHP_MEMBLOCK_API

On Mon, May 27, 2019 at 01:11:49PM +0200, David Hildenbrand wrote:
>No longer needed, the callers of arch_add_memory() can handle this
>manually.
>
>Cc: Andrew Morton <akpm@...ux-foundation.org>
>Cc: David Hildenbrand <david@...hat.com>
>Cc: Michal Hocko <mhocko@...e.com>
>Cc: Oscar Salvador <osalvador@...e.com>
>Cc: Pavel Tatashin <pasha.tatashin@...een.com>
>Cc: Wei Yang <richard.weiyang@...il.com>
>Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
>Cc: Qian Cai <cai@....pw>
>Cc: Arun KS <arunks@...eaurora.org>
>Cc: Mathieu Malaterre <malat@...ian.org>
>Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Wei Yang <richardw.yang@...ux.intel.com>

>---
> include/linux/memory_hotplug.h | 8 --------
> mm/memory_hotplug.c            | 9 +++------
> 2 files changed, 3 insertions(+), 14 deletions(-)
>
>diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
>index 2d4de313926d..2f1f87e13baa 100644
>--- a/include/linux/memory_hotplug.h
>+++ b/include/linux/memory_hotplug.h
>@@ -128,14 +128,6 @@ extern void arch_remove_memory(int nid, u64 start, u64 size,
> extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
> 			   unsigned long nr_pages, struct vmem_altmap *altmap);
> 
>-/*
>- * Do we want sysfs memblock files created. This will allow userspace to online
>- * and offline memory explicitly. Lack of this bit means that the caller has to
>- * call move_pfn_range_to_zone to finish the initialization.
>- */
>-
>-#define MHP_MEMBLOCK_API               (1<<0)
>-
> /* reasonably generic interface to expand the physical pages */
> extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
> 		       struct mhp_restrictions *restrictions);
>diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>index b1fde90bbf19..9a92549ef23b 100644
>--- a/mm/memory_hotplug.c
>+++ b/mm/memory_hotplug.c
>@@ -251,7 +251,7 @@ void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
> #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */
> 
> static int __meminit __add_section(int nid, unsigned long phys_start_pfn,
>-		struct vmem_altmap *altmap, bool want_memblock)
>+				   struct vmem_altmap *altmap)
> {
> 	int ret;
> 
>@@ -294,8 +294,7 @@ int __ref __add_pages(int nid, unsigned long phys_start_pfn,
> 	}
> 
> 	for (i = start_sec; i <= end_sec; i++) {
>-		err = __add_section(nid, section_nr_to_pfn(i), altmap,
>-				restrictions->flags & MHP_MEMBLOCK_API);
>+		err = __add_section(nid, section_nr_to_pfn(i), altmap);
> 
> 		/*
> 		 * EEXIST is finally dealt with by ioresource collision
>@@ -1067,9 +1066,7 @@ static int online_memory_block(struct memory_block *mem, void *arg)
>  */
> int __ref add_memory_resource(int nid, struct resource *res)
> {
>-	struct mhp_restrictions restrictions = {
>-		.flags = MHP_MEMBLOCK_API,
>-	};
>+	struct mhp_restrictions restrictions = {};
> 	u64 start, size;
> 	bool new_node = false;
> 	int ret;
>-- 
>2.20.1

-- 
Wei Yang
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