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swapin_readahead: move and rearrange args

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swapin_readahead has never sat well in mm/memory.c: move it to mm/swap_state.c
beside its kindred read_swap_cache_async.  Why were its args in a different
order?  rearrange them.  And since it was always followed by a
read_swap_cache_async of the target page, fold that in and return struct
page*.  Then CONFIG_SWAP=n no longer needs valid_swaphandles and
read_swap_cache_async stubs.

Signed-off-by: Hugh Dickins <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2008-02-04 22:28:41 -08:00 • committed by Linus Torvalds
commit 46017e9548
4 changed files with 57 additions and 60 deletions
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6
mm/shmem.c
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@ -1036,8 +1036,7 @@ static struct page *shmem_swapin(struct shmem_inode_info *info,
pvma.vm_pgoff = idx;
pvma.vm_ops = NULL;
pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
swapin_readahead(entry, 0, &pvma);
page = read_swap_cache_async(entry, &pvma, 0);
page = swapin_readahead(entry, &pvma, 0);
mpol_free(pvma.vm_policy);
return page;
}
@ -1067,8 +1066,7 @@ static inline int shmem_parse_mpol(char *value, int *policy,
static inline struct page *
shmem_swapin(struct shmem_inode_info *info,swp_entry_t entry,unsigned long idx)
{
swapin_readahead(entry, 0, NULL);
return read_swap_cache_async(entry, NULL, 0);
return swapin_readahead(entry, NULL, 0);
}
static inline struct page *