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authorMichal Hocko <mhocko@suse.com>2017-05-08 15:57:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-08 17:15:13 -0700
commit19809c2da28aee5860ad9a2eff760730a0710df0 (patch)
tree19c6c68f96d55ea25b71040a448c6890301a19f6 /net
parent54f180d3c181277457fb003dd9524c2aa1ef8160 (diff)
downloadlinux-19809c2da28aee5860ad9a2eff760730a0710df0.tar.bz2
mm, vmalloc: use __GFP_HIGHMEM implicitly
__vmalloc* allows users to provide gfp flags for the underlying allocation. This API is quite popular $ git grep "=[[:space:]]__vmalloc\|return[[:space:]]*__vmalloc" | wc -l 77 The only problem is that many people are not aware that they really want to give __GFP_HIGHMEM along with other flags because there is really no reason to consume precious lowmemory on CONFIG_HIGHMEM systems for pages which are mapped to the kernel vmalloc space. About half of users don't use this flag, though. This signals that we make the API unnecessarily too complex. This patch simply uses __GFP_HIGHMEM implicitly when allocating pages to be mapped to the vmalloc space. Current users which add __GFP_HIGHMEM are simplified and drop the flag. Link: http://lkml.kernel.org/r/20170307141020.29107-1-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: Cristopher Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ceph/ceph_common.c2
-rw-r--r--net/netfilter/x_tables.c3
2 files changed, 2 insertions, 3 deletions
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 108533859a53..4eb773ccce11 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -187,7 +187,7 @@ void *ceph_kvmalloc(size_t size, gfp_t flags)
return ptr;
}
- return __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
+ return __vmalloc(size, flags, PAGE_KERNEL);
}
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 3d0584665b5d..8876b7da6884 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -998,8 +998,7 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
if (sz <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))
info = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
if (!info) {
- info = __vmalloc(sz, GFP_KERNEL | __GFP_NOWARN |
- __GFP_NORETRY | __GFP_HIGHMEM,
+ info = __vmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY,
PAGE_KERNEL);
if (!info)
return NULL;