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mm/hmm: define the pre-processor related parts of hmm.h even if disabled

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Only the function calls are stubbed out with static inlines that always
fail. This is the standard way to write a header for an optional component
and makes it easier for drivers that only optionally need HMM_MIRROR.

Link: https://lore.kernel.org/r/20191112202231.3856-5-jgg@ziepe.ca
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Tested-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2019-11-12 16:22:21 -04:00
parent 04ec32fbc2
commit 107e899874
2 changed files with 47 additions and 13 deletions
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59
include/linux/hmm.h
View file

@ -62,8 +62,6 @@
#include <linux/kconfig.h>
#include <asm/pgtable.h>
#ifdef CONFIG_HMM_MIRROR
#include <linux/device.h>
#include <linux/migrate.h>
#include <linux/memremap.h>
@ -374,6 +372,15 @@ struct hmm_mirror {
struct list_head list;
};
/*
* Retry fault if non-blocking, drop mmap_sem and return -EAGAIN in that case.
*/
#define HMM_FAULT_ALLOW_RETRY (1 << 0)
/* Don't fault in missing PTEs, just snapshot the current state. */
#define HMM_FAULT_SNAPSHOT (1 << 1)
#ifdef CONFIG_HMM_MIRROR
int hmm_mirror_register(struct hmm_mirror *mirror, struct mm_struct *mm);
void hmm_mirror_unregister(struct hmm_mirror *mirror);
@ -383,14 +390,6 @@ void hmm_mirror_unregister(struct hmm_mirror *mirror);
int hmm_range_register(struct hmm_range *range, struct hmm_mirror *mirror);
void hmm_range_unregister(struct hmm_range *range);
/*
* Retry fault if non-blocking, drop mmap_sem and return -EAGAIN in that case.
*/
#define HMM_FAULT_ALLOW_RETRY (1 << 0)
/* Don't fault in missing PTEs, just snapshot the current state. */
#define HMM_FAULT_SNAPSHOT (1 << 1)
long hmm_range_fault(struct hmm_range *range, unsigned int flags);
long hmm_range_dma_map(struct hmm_range *range,
@ -401,6 +400,44 @@ long hmm_range_dma_unmap(struct hmm_range *range,
struct device *device,
dma_addr_t *daddrs,
bool dirty);
#else
int hmm_mirror_register(struct hmm_mirror *mirror, struct mm_struct *mm)
{
return -EOPNOTSUPP;
}
void hmm_mirror_unregister(struct hmm_mirror *mirror)
{
}
int hmm_range_register(struct hmm_range *range, struct hmm_mirror *mirror)
{
return -EOPNOTSUPP;
}
void hmm_range_unregister(struct hmm_range *range)
{
}
static inline long hmm_range_fault(struct hmm_range *range, unsigned int flags)
{
return -EOPNOTSUPP;
}
static inline long hmm_range_dma_map(struct hmm_range *range,
struct device *device, dma_addr_t *daddrs,
unsigned int flags)
{
return -EOPNOTSUPP;
}
static inline long hmm_range_dma_unmap(struct hmm_range *range,
struct device *device,
dma_addr_t *daddrs, bool dirty)
{
return -EOPNOTSUPP;
}
#endif
/*
* HMM_RANGE_DEFAULT_TIMEOUT - default timeout (ms) when waiting for a range
@ -411,6 +448,4 @@ long hmm_range_dma_unmap(struct hmm_range *range,
*/
#define HMM_RANGE_DEFAULT_TIMEOUT 1000
#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
#endif /* LINUX_HMM_H */

1
kernel/fork.c
View file

@ -40,7 +40,6 @@
#include <linux/binfmts.h>
#include <linux/mman.h>
#include <linux/mmu_notifier.h>
#include <linux/hmm.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/vmacache.h>