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65dd2d6072
Currently, page->private on an afs page is used to store the range of
dirtied data within the page, where the range includes the lower bound, but
excludes the upper bound (e.g. 0-1 is a range covering a single byte).
This, however, requires a superfluous bit for the last-byte bound so that
on a 4KiB page, it can say 0-4096 to indicate the whole page, the idea
being that having both numbers the same would indicate an empty range.
This is unnecessary as the PG_private bit is clear if it's an empty range
(as is PG_dirty).
Alter the way the dirty range is encoded in page->private such that the
upper bound is reduced by 1 (e.g. 0-0 is then specified the same single
byte range mentioned above).
Applying this to both bounds frees up two bits, one of which can be used in
a future commit.
This allows the afs filesystem to be compiled on ppc32 with 64K pages;
without this, the following warnings are seen:
../fs/afs/internal.h: In function 'afs_page_dirty_to':
../fs/afs/internal.h:881:15: warning: right shift count >= width of type [-Wshift-count-overflow]
881 | return (priv >> __AFS_PAGE_PRIV_SHIFT) & __AFS_PAGE_PRIV_MASK;
| ^~
../fs/afs/internal.h: In function 'afs_page_dirty':
../fs/afs/internal.h:886:28: warning: left shift count >= width of type [-Wshift-count-overflow]
886 | return ((unsigned long)to << __AFS_PAGE_PRIV_SHIFT) | from;
| ^~
Fixes:
|
||
|---|---|---|
| .. | ||
| addr_list.c | ||
| afs.h | ||
| afs_cm.h | ||
| afs_fs.h | ||
| afs_vl.h | ||
| cache.c | ||
| callback.c | ||
| cell.c | ||
| cmservice.c | ||
| dir.c | ||
| dir_edit.c | ||
| dir_silly.c | ||
| dynroot.c | ||
| file.c | ||
| flock.c | ||
| fs_operation.c | ||
| fs_probe.c | ||
| fsclient.c | ||
| inode.c | ||
| internal.h | ||
| Kconfig | ||
| main.c | ||
| Makefile | ||
| misc.c | ||
| mntpt.c | ||
| proc.c | ||
| protocol_uae.h | ||
| protocol_yfs.h | ||
| rotate.c | ||
| rxrpc.c | ||
| security.c | ||
| server.c | ||
| server_list.c | ||
| super.c | ||
| vl_alias.c | ||
| vl_list.c | ||
| vl_probe.c | ||
| vl_rotate.c | ||
| vlclient.c | ||
| volume.c | ||
| write.c | ||
| xattr.c | ||
| xdr_fs.h | ||
| yfsclient.c | ||