mm/memory_hotplug: prepare passing flags to add_memory() and friends

We soon want to pass flags, e.g., to mark added System RAM resources.
mergeable.  Prepare for that.

This patch is based on a similar patch by Oscar Salvador:

https://lkml.kernel.org/r/20190625075227.15193-3-osalvador@suse.de

Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Juergen Gross <jgross@suse.com> # Xen related part
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Baoquan He <bhe@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: "Oliver O'Halloran" <oohall@gmail.com>
Cc: Pingfan Liu <kernelfans@gmail.com>
Cc: Nathan Lynch <nathanl@linux.ibm.com>
Cc: Libor Pechacek <lpechacek@suse.cz>
Cc: Anton Blanchard <anton@ozlabs.org>
Cc: Leonardo Bras <leobras.c@gmail.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Julien Grall <julien@xen.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Roger Pau Monné <roger.pau@citrix.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Link: https://lkml.kernel.org/r/20200911103459.10306-5-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
index 13b369d..6828108 100644 (file)
--- a/arch/powerpc/platforms/powernv/memtrace.c
+++ b/arch/powerpc/platforms/powernv/memtrace.c
@@ -224,7 +224,7 @@ static int memtrace_online(void)
                        ent->mem = 0;
                }
 
-               if (add_memory(ent->nid, ent->start, ent->size)) {
+               if (add_memory(ent->nid, ent->start, ent->size, MHP_NONE)) {
                        pr_err("Failed to add trace memory to node %d\n",
                                ent->nid);
                        ret += 1;

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index 5d545b7..d8bbf0c 100644 (file)
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -606,7 +606,7 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb)
        block_sz = memory_block_size_bytes();
 
        /* Add the memory */
-       rc = __add_memory(lmb->nid, lmb->base_addr, block_sz);
+       rc = __add_memory(lmb->nid, lmb->base_addr, block_sz, MHP_NONE);
        if (rc) {
                invalidate_lmb_associativity_index(lmb);
                return rc;

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index ad6e90f..b02fd51 100644 (file)
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -194,7 +194,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
                if (node < 0)
                        node = memory_add_physaddr_to_nid(info->start_addr);
 
-               result = __add_memory(node, info->start_addr, info->length);
+               result = __add_memory(node, info->start_addr, info->length,
+                                     MHP_NONE);
 
                /*
                 * If the memory block has been used by the kernel, add_memory()

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index adf828d..eef4ffb 100644 (file)
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -432,7 +432,8 @@ static ssize_t probe_store(struct device *dev, struct device_attribute *attr,
 
        nid = memory_add_physaddr_to_nid(phys_addr);
        ret = __add_memory(nid, phys_addr,
-                          MIN_MEMORY_BLOCK_SIZE * sections_per_block);
+                          MIN_MEMORY_BLOCK_SIZE * sections_per_block,
+                          MHP_NONE);
 
        if (ret)
                goto out;

diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index af04b6d..b4368c5 100644 (file)
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -109,7 +109,7 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
                 * this as RAM automatically.
                 */
                rc = add_memory_driver_managed(numa_node, range.start,
-                               range_len(&range), kmem_name);
+                               range_len(&range), kmem_name, MHP_NONE);
 
                if (rc) {
                        dev_warn(dev, "mapping%d: %#llx-%#llx memory add failed\n",

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 32e3bc0..3c0d52e 100644 (file)
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -726,7 +726,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
 
                nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn));
                ret = add_memory(nid, PFN_PHYS((start_pfn)),
-                               (HA_CHUNK << PAGE_SHIFT));
+                               (HA_CHUNK << PAGE_SHIFT), MHP_NONE);
 
                if (ret) {
                        pr_err("hot_add memory failed error is %d\n", ret);

diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index a864b21..f6e97f0 100644 (file)
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -406,7 +406,7 @@ static void __init add_memory_merged(u16 rn)
        if (!size)
                goto skip_add;
        for (addr = start; addr < start + size; addr += block_size)
-               add_memory(0, addr, block_size);
+               add_memory(0, addr, block_size, MHP_NONE);
 skip_add:
        first_rn = rn;
        num = 1;

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 834b7c1..ed99e43 100644 (file)
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -424,7 +424,7 @@ static int virtio_mem_mb_add(struct virtio_mem *vm, unsigned long mb_id)
 
        dev_dbg(&vm->vdev->dev, "adding memory block: %lu\n", mb_id);
        return add_memory_driver_managed(nid, addr, memory_block_size_bytes(),
-                                        vm->resource_name);
+                                        vm->resource_name, MHP_NONE);
 }
 
 /*

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 51427c7..9f40a29 100644 (file)
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -331,7 +331,7 @@ static enum bp_state reserve_additional_memory(void)
        mutex_unlock(&balloon_mutex);
        /* add_memory_resource() requires the device_hotplug lock */
        lock_device_hotplug();
-       rc = add_memory_resource(nid, resource);
+       rc = add_memory_resource(nid, resource, MHP_NONE);
        unlock_device_hotplug();
        mutex_lock(&balloon_mutex);
 

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 1504b4d..33eb80f 100644 (file)
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -57,6 +57,12 @@ enum {
        MMOP_ONLINE_MOVABLE,
 };
 
+/* Flags for add_memory() and friends to specify memory hotplug details. */
+typedef int __bitwise mhp_t;
+
+/* No special request */
+#define MHP_NONE               ((__force mhp_t)0)
+
 /*
  * Extended parameters for memory hotplug:
  * altmap: alternative allocator for memmap array (optional)
@@ -339,11 +345,13 @@ extern void clear_zone_contiguous(struct zone *zone);
 
 #ifdef CONFIG_MEMORY_HOTPLUG
 extern void __ref free_area_init_core_hotplug(int nid);
-extern int __add_memory(int nid, u64 start, u64 size);
-extern int add_memory(int nid, u64 start, u64 size);
-extern int add_memory_resource(int nid, struct resource *resource);
+extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
+extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
+extern int add_memory_resource(int nid, struct resource *resource,
+                              mhp_t mhp_flags);
 extern int add_memory_driver_managed(int nid, u64 start, u64 size,
-                                    const char *resource_name);
+                                    const char *resource_name,
+                                    mhp_t mhp_flags);
 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
                                   unsigned long nr_pages,
                                   struct vmem_altmap *altmap, int migratetype);

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9a71939..dba71bc 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1039,7 +1039,7 @@ static int online_memory_block(struct memory_block *mem, void *arg)
  *
  * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG
  */
-int __ref add_memory_resource(int nid, struct resource *res)
+int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
 {
        struct mhp_params params = { .pgprot = PAGE_KERNEL };
        u64 start, size;
@@ -1119,7 +1119,7 @@ error:
 }
 
 /* requires device_hotplug_lock, see add_memory_resource() */
-int __ref __add_memory(int nid, u64 start, u64 size)
+int __ref __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags)
 {
        struct resource *res;
        int ret;
@@ -1128,18 +1128,18 @@ int __ref __add_memory(int nid, u64 start, u64 size)
        if (IS_ERR(res))
                return PTR_ERR(res);
 
-       ret = add_memory_resource(nid, res);
+       ret = add_memory_resource(nid, res, mhp_flags);
        if (ret < 0)
                release_memory_resource(res);
        return ret;
 }
 
-int add_memory(int nid, u64 start, u64 size)
+int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags)
 {
        int rc;
 
        lock_device_hotplug();
-       rc = __add_memory(nid, start, size);
+       rc = __add_memory(nid, start, size, mhp_flags);
        unlock_device_hotplug();
 
        return rc;
@@ -1168,7 +1168,7 @@ EXPORT_SYMBOL_GPL(add_memory);
  * "System RAM ($DRIVER)".
  */
 int add_memory_driver_managed(int nid, u64 start, u64 size,
-                             const char *resource_name)
+                             const char *resource_name, mhp_t mhp_flags)
 {
        struct resource *res;
        int rc;
@@ -1186,7 +1186,7 @@ int add_memory_driver_managed(int nid, u64 start, u64 size,
                goto out_unlock;
        }
 
-       rc = add_memory_resource(nid, res);
+       rc = add_memory_resource(nid, res, mhp_flags);
        if (rc < 0)
                release_memory_resource(res);