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Subject[PATCH] mm/hugetlb: Fix build failure with HUGETLB_PAGE but not HUGEBTLBFS
Date
When CONFIG_HUGETLB_PAGE is set but not CONFIG_HUGETLBFS, the
following build failure is encoutered:

In file included from arch/powerpc/mm/fault.c:33:0:
./include/linux/hugetlb.h: In function 'hstate_inode':
./include/linux/hugetlb.h:477:9: error: implicit declaration of function 'HUGETLBFS_SB' [-Werror=implicit-function-declaration]
return HUGETLBFS_SB(i->i_sb)->hstate;
^
./include/linux/hugetlb.h:477:30: error: invalid type argument of '->' (have 'int')
return HUGETLBFS_SB(i->i_sb)->hstate;
^

Gate hstate_inode() with CONFIG_HUGETLBFS instead of CONFIG_HUGETLB_PAGE.

Reported-by: kbuild test robot <lkp@intel.com>
Link: https://patchwork.ozlabs.org/patch/1255548/#2386036
Fixes: a137e1cc6d6e ("hugetlbfs: per mount huge page sizes")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
include/linux/hugetlb.h | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 1e897e4168ac..dafb3d70ff81 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -390,7 +390,10 @@ static inline bool is_file_hugepages(struct file *file)
return is_file_shm_hugepages(file);
}

-
+static inline struct hstate *hstate_inode(struct inode *i)
+{
+ return HUGETLBFS_SB(i->i_sb)->hstate;
+}
#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file) false
@@ -402,6 +405,10 @@ hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
return ERR_PTR(-ENOSYS);
}

+static inline struct hstate *hstate_inode(struct inode *i)
+{
+ return NULL;
+}
#endif /* !CONFIG_HUGETLBFS */

#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
@@ -472,11 +479,6 @@ extern unsigned int default_hstate_idx;

#define default_hstate (hstates[default_hstate_idx])

-static inline struct hstate *hstate_inode(struct inode *i)
-{
- return HUGETLBFS_SB(i->i_sb)->hstate;
-}
-
static inline struct hstate *hstate_file(struct file *f)
{
return hstate_inode(file_inode(f));
@@ -729,11 +731,6 @@ static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
return NULL;
}

-static inline struct hstate *hstate_inode(struct inode *i)
-{
- return NULL;
-}
-
static inline struct hstate *page_hstate(struct page *page)
{
return NULL;
--
2.25.0
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