mm/hugetlb: introduce ARCH_HAS_GIGANTIC_PAGE

Avoid making ifdef get pretty unwieldy if many ARCHs support gigantic
page.  No functional change with this patch.

Link: http://lkml.kernel.org/r/1475227569-63446-2-git-send-email-xieyisheng1@huawei.com
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
Suggested-by: Michal Hocko <mhocko@suse.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index deeadfa..fb53803 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -71,6 +71,7 @@ config S390
        select ARCH_HAS_DEVMEM_IS_ALLOWED
        select ARCH_HAS_ELF_RANDOMIZE
        select ARCH_HAS_GCOV_PROFILE_ALL
+       select ARCH_HAS_GIGANTIC_PAGE
        select ARCH_HAS_KCOV
        select ARCH_HAS_SG_CHAIN
        select ARCH_HAS_UBSAN_SANITIZE_ALL

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 58bec8f..827273c 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -28,6 +28,7 @@ config X86
        select ARCH_HAS_ELF_RANDOMIZE
        select ARCH_HAS_FAST_MULTIPLIER
        select ARCH_HAS_GCOV_PROFILE_ALL
+       select ARCH_HAS_GIGANTIC_PAGE           if X86_64
        select ARCH_HAS_KCOV                    if X86_64
        select ARCH_HAS_PMEM_API                if X86_64
        select ARCH_HAS_MMIO_FLUSH

diff --git a/fs/Kconfig b/fs/Kconfig
index 3ef62ba..4bd03a2 100644 (file)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -200,6 +200,9 @@ config HUGETLBFS
 config HUGETLB_PAGE
        def_bool HUGETLBFS
 
+config ARCH_HAS_GIGANTIC_PAGE
+       bool
+
 source "fs/configfs/Kconfig"
 source "fs/efivarfs/Kconfig"
 

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 770d83e..e4a4500 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1022,7 +1022,7 @@ static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed)
                ((node = hstate_next_node_to_free(hs, mask)) || 1);     \
                nr_nodes--)
 
-#if (defined(CONFIG_X86_64) || defined(CONFIG_S390)) && \
+#if defined(CONFIG_ARCH_HAS_GIGANTIC_PAGE) && \
        ((defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || \
        defined(CONFIG_CMA))
 static void destroy_compound_gigantic_page(struct page *page,