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authorAnshuman Khandual <anshuman.khandual@arm.com>2021-02-25 17:17:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-26 09:41:01 -0800
commit7707248a4727c4e8ee8d84ed578a9807d8994a40 (patch)
tree7a786d3597861b09b512966383d7b29c102d0acf /arch
parent03aaf83fba6e5af08b5dd174c72edee9b7d9ed9b (diff)
s390/mm: define arch_get_mappable_range()
This overrides arch_get_mappabble_range() on s390 platform which will be used with recently added generic framework. It modifies the existing range check in vmem_add_mapping() using arch_get_mappable_range(). It also adds a VM_BUG_ON() check that would ensure that mhp_range_allowed() has already been called on the hotplug path. Link: https://lkml.kernel.org/r/1612149902-7867-4-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Pankaj Gupta <pankaj.gupta@cloud.ionos.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: teawater <teawaterz@linux.alibaba.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/mm/init.c1
-rw-r--r--arch/s390/mm/vmem.c14
2 files changed, 14 insertions, 1 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 73a163065b95..0e76b2127dc6 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -297,6 +297,7 @@ int arch_add_memory(int nid, u64 start, u64 size,
if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
return -EINVAL;
+ VM_BUG_ON(!mhp_range_allowed(start, size, true));
rc = vmem_add_mapping(start, size);
if (rc)
return rc;
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 01f3a5f58e64..82dbf9450105 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -4,6 +4,7 @@
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
*/
+#include <linux/memory_hotplug.h>
#include <linux/memblock.h>
#include <linux/pfn.h>
#include <linux/mm.h>
@@ -532,11 +533,22 @@ void vmem_remove_mapping(unsigned long start, unsigned long size)
mutex_unlock(&vmem_mutex);
}
+struct range arch_get_mappable_range(void)
+{
+ struct range mhp_range;
+
+ mhp_range.start = 0;
+ mhp_range.end = VMEM_MAX_PHYS - 1;
+ return mhp_range;
+}
+
int vmem_add_mapping(unsigned long start, unsigned long size)
{
+ struct range range = arch_get_mappable_range();
int ret;
- if (start + size > VMEM_MAX_PHYS ||
+ if (start < range.start ||
+ start + size > range.end + 1 ||
start + size < start)
return -ERANGE;