linux/drivers/nvdimm
Kirill A. Shutemov 09cbfeaf1a mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.

This promise never materialized.  And unlikely will.

We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE.  And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.

Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.

Let's stop pretending that pages in page cache are special.  They are
not.

The changes are pretty straight-forward:

 - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;

 - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;

 - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};

 - page_cache_get() -> get_page();

 - page_cache_release() -> put_page();

This patch contains automated changes generated with coccinelle using
script below.  For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.

The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.

There are few places in the code where coccinelle didn't reach.  I'll
fix them manually in a separate patch.  Comments and documentation also
will be addressed with the separate patch.

virtual patch

@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E

@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E

@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT

@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE

@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK

@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)

@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)

@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-04 10:41:08 -07:00
..
blk.c nvdimm/blk: don't allocate unused major device number 2016-03-09 14:59:41 -08:00
btt_devs.c libnvdimm: btt_devs: Fix locking in namespace_store 2015-09-17 11:37:16 -04:00
btt.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
btt.h libnvdimm, btt: consolidate arena validation 2015-08-14 13:43:04 -04:00
bus.c Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2016-03-19 16:31:54 -07:00
claim.c libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00
core.c nfit, libnvdimm: async region scrub workqueue 2016-03-05 12:24:06 -08:00
dimm_devs.c libnvdimm, nfit: centralize command status translation 2016-03-05 12:24:06 -08:00
dimm.c libnvdimm: pmem label sets and namespace instantiation. 2015-06-24 21:24:10 -04:00
e820.c x86, kexec, nvdimm: Use walk_iomem_res_desc() for iomem search 2016-01-30 09:49:59 +01:00
Kconfig libnvdimm, pmem: 'struct page' for pmem 2015-08-28 23:40:04 -04:00
label.c libnvdimm: infrastructure for btt devices 2015-06-25 04:20:04 -04:00
label.h libnvdimm: write blk label set 2015-06-24 21:24:10 -04:00
Makefile libnvdimm, pfn: 'struct page' provider infrastructure 2015-08-28 23:39:36 -04:00
namespace_devs.c libnvdimm, pmem: adjust for section collisions with 'System RAM' 2016-03-05 12:25:45 -08:00
nd-core.h Merge branch 'for-4.5/block-dax' into for-4.5/libnvdimm 2016-01-10 07:53:55 -08:00
nd.h libnvdimm, pmem: clear poison on write 2016-03-09 15:15:32 -08:00
pfn_devs.c libnvdimm, pfn: 'resource'-address and 'size' attributes for pfn devices 2016-03-05 12:25:45 -08:00
pfn.h libnvdimm, pmem: adjust for section collisions with 'System RAM' 2016-03-05 12:25:45 -08:00
pmem.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
region_devs.c libnvdimm: fix namespace object confusion in is_uuid_busy() 2016-01-05 18:37:23 -08:00
region.c libnvdimm: async notification support 2016-03-05 12:24:06 -08:00