[PATCH 11/13] mm, memory_hotplug: replace for_device by want_memblock in arch_add_memory

From: Michal Hocko
Date: Fri Apr 21 2017 - 08:22:06 EST

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From: Michal Hocko <mhocko@xxxxxxxx>

arch_add_memory gets for_device argument which then controls whether we
want to create memblocks for created memory sections. Simplify the logic
by telling whether we want memblocks directly rather than going through
pointless negation. This also makes the api easier to understand because
it is clear what we want rather than nothing telling for_device which
can mean anything.

This shouldn't introduce any functional change.

Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
---
arch/ia64/mm/init.c | 4 ++--
arch/powerpc/mm/mem.c | 4 ++--
arch/s390/mm/init.c | 4 ++--
arch/sh/mm/init.c | 4 ++--
arch/x86/mm/init_32.c | 4 ++--
arch/x86/mm/init_64.c | 4 ++--
include/linux/memory_hotplug.h | 2 +-
kernel/memremap.c | 2 +-
mm/memory_hotplug.c | 2 +-
9 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 80db57d063d0..a4e8d6bd9cfa 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -646,13 +646,13 @@ mem_init (void)
}

#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;

- ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
+ ret = __add_pages(nid, start_pfn, nr_pages, want_memblock);
if (ret)
printk("%s: Problem encountered in __add_pages() as ret=%d\n",
__func__, ret);
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 72c46eb53215..de5a90e1ceaa 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -126,7 +126,7 @@ int __weak remove_section_mapping(unsigned long start, unsigned long end)
return -ENODEV;
}

-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
@@ -143,7 +143,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
return -EFAULT;
}

- return __add_pages(nid, start_pfn, nr_pages, !for_device);
+ return __add_pages(nid, start_pfn, nr_pages, want_memblock);
}

#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 862824924ba6..f4fb5d191562 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -162,7 +162,7 @@ unsigned long memory_block_size_bytes(void)
}

#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long size_pages = PFN_DOWN(size);
@@ -172,7 +172,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
if (rc)
return rc;

- rc = __add_pages(nid, start_pfn, size_pages, !for_device);
+ rc = __add_pages(nid, start_pfn, size_pages, want_memblock);
if (rc)
vmem_remove_mapping(start, size);
return rc;
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 3813a610a2bb..bf726af5f1a5 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -485,14 +485,14 @@ void free_initrd_mem(unsigned long start, unsigned long end)
#endif

#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;

/* We only have ZONE_NORMAL, so this is easy.. */
- ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
+ ret = __add_pages(nid, start_pfn, nr_pages, want_memblock);
if (unlikely(ret))
printk("%s: Failed, __add_pages() == %d\n", __func__, ret);

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index a424066d0552..8a64a6f2848d 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -823,12 +823,12 @@ void __init mem_init(void)
}

#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;

- return __add_pages(nid, start_pfn, nr_pages, !for_device);
+ return __add_pages(nid, start_pfn, nr_pages, want_memblock);
}

#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index f07c850efa30..ffeba90c3449 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -682,7 +682,7 @@ static void update_end_of_memory_vars(u64 start, u64 size)
}
}

-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
@@ -690,7 +690,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)

init_memory_mapping(start, start + size);

- ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
+ ret = __add_pages(nid, start_pfn, nr_pages, want_memblock);
WARN_ON_ONCE(ret);

/* update max_pfn, max_low_pfn and high_memory */
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 9cd76ff7b0c5..e1193c44aed1 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -297,7 +297,7 @@ extern int add_memory(int nid, u64 start, u64 size);
extern int add_memory_resource(int nid, struct resource *resource, bool online);
extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
bool for_device);
-extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
+extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 61aaa41f4e18..ea714eee029c 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -363,7 +363,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
goto err_pfn_remap;

mem_hotplug_begin();
- error = arch_add_memory(nid, align_start, align_size, true);
+ error = arch_add_memory(nid, align_start, align_size, false);
if (!error)
move_pfn_range_to_zone(&NODE_DATA(nid)->node_zones[ZONE_DEVICE],
align_start >> PAGE_SHIFT,
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 64b5b5b191a0..c5ca2a8571d0 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1430,7 +1430,7 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online)
}

/* call arch's memory hotadd */
- ret = arch_add_memory(nid, start, size, false);
+ ret = arch_add_memory(nid, start, size, true);

if (ret < 0)
goto error;
--
2.11.0

Next message: Michal Hocko: "[PATCH 12/13] mm, memory_hotplug: fix the section mismatch warning"
Previous message: Joerg Roedel: "Re: [PATCH] x86/mpx: Correctly report do_mpx_bt_fault() failures to user-space"
In reply to: Michal Hocko: "[PATCH 09/13] mm: __first_valid_page skip over offline pages"
Next in thread: Michal Hocko: "[PATCH 12/13] mm, memory_hotplug: fix the section mismatch warning"
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