• Arjun Roy's avatar
    mm: define pte_index as macro for x86 · c97078bd
    Arjun Roy authored
    pte_index() is either defined as a macro (e.g.  sparc64) or as an
    inlined function (e.g.  x86).  vm_insert_pages() depends on pte_index
    but it is not defined on all platforms (e.g.  m68k).
    
    To fix compilation of vm_insert_pages() on architectures not providing
    pte_index(), we perform the following fix:
    
    0. For platforms where it is meaningful, and defined as a macro, no
        change is needed.
    1. For platforms where it is meaningful and defined as an inlined
        function, and we want to use it with vm_insert_pages(), we define
        a degenerate macro of the form:  #define pte_index pte_index
    2. vm_insert_pages() checks for the existence of a pte_index macro
       definition. If found, it implements a batched insert. If not found,
       it devolves to calling vm_insert_page() in a loop.
    
    This patch implements step 1 for x86.
    
    v3 of this patch fixes a compilation warning for an unused method.
    v2 of this patch moved a macro definition to a more readable location.
    Signed-off-by: default avatarArjun Roy <arjunroy@google.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Cc: David Miller <davem@davemloft.net>
    Cc: Eric Dumazet <edumazet@google.com>
    Cc: Jason Gunthorpe <jgg@ziepe.ca>
    Cc: Matthew Wilcox <willy@infradead.org>
    Cc: Soheil Hassas Yeganeh <soheil@google.com>
    Cc: Stephen Rothwell <sfr@canb.auug.org.au>
    Link: http://lkml.kernel.org/r/20200228054714.204424-1-arjunroy.kdev@gmail.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    c97078bd
pgtable.h 36.2 KB