• Mike Rapoport's avatar
    asm-generic: pgalloc: provide generic pmd_alloc_one() and pmd_free_one() · 1355c31e
    Mike Rapoport authored
    For most architectures that support >2 levels of page tables,
    pmd_alloc_one() is a wrapper for __get_free_pages(), sometimes with
    __GFP_ZERO and sometimes followed by memset(0) instead.
    
    More elaborate versions on arm64 and x86 account memory for the user page
    tables and call to pgtable_pmd_page_ctor() as the part of PMD page
    initialization.
    
    Move the arm64 version to include/asm-generic/pgalloc.h and use the
    generic version on several architectures.
    
    The pgtable_pmd_page_ctor() is a NOP when ARCH_ENABLE_SPLIT_PMD_PTLOCK is
    not enabled, so there is no functional change for most architectures
    except of the addition of __GFP_ACCOUNT for allocation of user page
    tables.
    
    The pmd_free() is a wrapper for free_page() in all the cases, so no
    functional change here.
    Signed-off-by: default avatarMike Rapoport <rppt@linux.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Reviewed-by: default avatarPekka Enberg <penberg@kernel.org>
    Cc: Matthew Wilcox <willy@infradead.org>
    Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
    Cc: Joerg Roedel <joro@8bytes.org>
    Cc: Joerg Roedel <jroedel@suse.de>
    Cc: Max Filippov <jcmvbkbc@gmail.com>
    Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
    Cc: Stafford Horne <shorne@gmail.com>
    Cc: Stephen Rothwell <sfr@canb.auug.org.au>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Geert Uytterhoeven <geert@linux-m68k.org>
    Link: http://lkml.kernel.org/r/20200627143453.31835-5-rppt@kernel.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    1355c31e
pgalloc.h 1.9 KB