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  • Laurent Dufour's avatar
    mm: introduce ARCH_HAS_PTE_SPECIAL · 3010a5ea
    Laurent Dufour authored
    Currently the PTE special supports is turned on in per architecture
    header files.  Most of the time, it is defined in
    arch/*/include/asm/pgtable.h depending or not on some other per
    architecture static definition.
    
    This patch introduce a new configuration variable to manage this
    directly in the Kconfig files.  It would later replace
    __HAVE_ARCH_PTE_SPECIAL.
    
    Here notes for some architecture where the definition of
    __HAVE_ARCH_PTE_SPECIAL is not obvious:
    
    arm
     __HAVE_ARCH_PTE_SPECIAL which is currently defined in
    arch/arm/include/asm/pgtable-3level.h which is included by
    arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
    So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.
    
    powerpc
    __HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
     - arch/powerpc/include/asm/book3s/64/pgtable.h
     - arch/powerpc/include/asm/pte-common.h
    The first one is included if (PPC_BOOK3S & PPC64) while the second is
    included in all the other cases.
    So select ARCH_HAS_PTE_SPECIAL all the time.
    
    sparc:
    __HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
    defined(__arch64__) which are defined through the compiler in
    sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
    So select ARCH_HAS_PTE_SPECIAL if SPARC64
    
    There is no functional change introduced by this patch.
    
    Link: http://lkml.kernel.org/r/1523433816-14460-2-git-send-email-ldufour@linux.vnet.ibm.com
    
    
    Signed-off-by: default avatarLaurent Dufour <ldufour@linux.vnet.ibm.com>
    Suggested-by: default avatarJerome Glisse <jglisse@redhat.com>
    Reviewed-by: default avatarJerome Glisse <jglisse@redhat.com>
    Acked-by: default avatarDavid Rientjes <rientjes@google.com>
    Cc: Michal Hocko <mhocko@kernel.org>
    Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
    Cc: Rich Felker <dalias@libc.org>
    Cc: David S. Miller <davem@davemloft.net>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Vineet Gupta <vgupta@synopsys.com>
    Cc: Palmer Dabbelt <palmer@sifive.com>
    Cc: Albert Ou <albert@sifive.com>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Robin Murphy <robin.murphy@arm.com>
    Cc: Christophe LEROY <christophe.leroy@c-s.fr>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    3010a5ea