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xen: provide a prototype for xen_biovec_phys_mergeable in xen.h

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Having multiple externs in arch headers is not a good way to provide
a common interface.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2018-09-25 13:30:07 -07:00 committed by Jens Axboe
parent cd11b1d344
commit 20e3267601
4 changed files with 4 additions and 10 deletions
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3
arch/arm/include/asm/io.h
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@ -459,9 +459,6 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
#include <asm-generic/io.h>
struct bio_vec;
extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
const struct bio_vec *vec2);
#define ARCH_BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
(!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))

3
arch/arm64/include/asm/io.h
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@ -205,9 +205,6 @@ extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
extern int devmem_is_allowed(unsigned long pfn);
struct bio_vec;
extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
const struct bio_vec *vec2);
#define ARCH_BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
(!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))

4
arch/x86/include/asm/io.h
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@ -371,10 +371,6 @@ extern bool is_early_ioremap_ptep(pte_t *ptep);
#ifdef CONFIG_XEN
#include <xen/xen.h>
struct bio_vec;
extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
const struct bio_vec *vec2);
#define ARCH_BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
(!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))

4
include/xen/xen.h
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@ -39,4 +39,8 @@ extern uint32_t xen_start_flags;
#define xen_initial_domain() (0)
#endif /* CONFIG_XEN_DOM0 */
struct bio_vec;
bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
const struct bio_vec *vec2);
#endif /* _XEN_XEN_H */