• Kirill A. Shutemov's avatar
    mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros · 09cbfeaf
    Kirill A. Shutemov authored
    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
    The changes are pretty straight-forward:
     - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
     - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
     - page_cache_get() -> get_page();
     - page_cache_release() -> put_page();
    This patc...
userfaultfd.c 7.16 KB