]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
ia64: perfmon: don't mark buffer pages as PG_reserved
authorDavid Hildenbrand <david@redhat.com>
Tue, 5 Mar 2019 23:47:32 +0000 (15:47 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 6 Mar 2019 05:07:19 +0000 (21:07 -0800)
commit731351d1bd3211101b4de8975540e273bcc99838
treea49a2d4292b7b30dd4f1e0c33d9fc3c39c522bf1
parentd9fa9d951779eb8110879f796434876a58321ae9
ia64: perfmon: don't mark buffer pages as PG_reserved

In the old days, remap_pfn_range() required pages to be marked as
PG_reserved, so they would e.g.  never get swapped out.  This was
required for special mappings.  Nowadays, this is fully handled via the
VMA (VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP inside
remap_pfn_range() to be precise).  PG_reserved is no longer required but
only a relic from the past.

So only architecture specific MM handling might require it (e.g.  to
detect them as MMIO pages).  As there are no architecture specific
checks for PageReserved() apart from MCA handling in ia64code, this can
go.  Use simple vzalloc()/vfree() instead.

Note that before calling vzalloc(), size has already been aligned to
PAGE_SIZE, no need to align again.

Link: http://lkml.kernel.org/r/20190114125903.24845-9-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/ia64/kernel/perfmon.c