• Anshuman Khandual's avatar
    mm/mmap: build protect protection_map[] with __P000 · 84053271
    Anshuman Khandual authored
    Patch series "mm/mmap: Drop __SXXX/__PXXX macros from across platforms",
    v7.
    
    __SXXX/__PXXX macros are unnecessary abstraction layer in creating the
    generic protection_map[] array which is used for vm_get_page_prot().  This
    abstraction layer can be avoided, if the platforms just define the array
    protection_map[] for all possible vm_flags access permission combinations
    and also export vm_get_page_prot() implementation.
    
    This series drops __SXXX/__PXXX macros from across platforms in the tree. 
    First it build protects generic protection_map[] array with '#ifdef
    __P000' and moves it inside platforms which enable
    ARCH_HAS_VM_GET_PAGE_PROT.  Later this build protects same array with
    '#ifdef ARCH_HAS_VM_GET_PAGE_PROT' and moves inside remaining platforms
    while enabling ARCH_HAS_VM_GET_PAGE_PROT.  This adds a new macro
    DECLARE_VM_GET_PAGE_PROT defining the current generic vm_get_page_prot(),
    in order for it to be reused on platforms that do not require custom
    implementation.  Finally, ARCH_HAS_VM_GET_PAGE_PROT can just be dropped,
    as all platforms now define and export vm_get_page_prot(), via looking up
    a private and static protection_map[] array.  protection_map[] data type
    has been changed as 'static const' on all platforms that do not change it
    during boot.
    
    
    This patch (of 26):
    
    Build protect generic protection_map[] array with __P000, so that it can
    be moved inside all the platforms one after the other.  Otherwise there
    will be build failures during this process. 
    CONFIG_ARCH_HAS_VM_GET_PAGE_PROT cannot be used for this purpose as only
    certain platforms enable this config now.
    
    Link: https://lkml.kernel.org/r/20220711070600.2378316-1-anshuman.khandual@arm.com
    Link: https://lkml.kernel.org/r/20220711070600.2378316-2-anshuman.khandual@arm.comSigned-off-by: default avatarAnshuman Khandual <anshuman.khandual@arm.com>
    Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
    Reviewed-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
    Suggested-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Brian Cain <bcain@quicinc.com>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: Chris Zankel <chris@zankel.net>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Dinh Nguyen <dinguyen@kernel.org>
    Cc: Geert Uytterhoeven <geert@linux-m68k.org>
    Cc: Guo Ren <guoren@kernel.org>
    Cc: Heiko Carstens <hca@linux.ibm.com>
    Cc: Huacai Chen <chenhuacai@kernel.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
    Cc: Jeff Dike <jdike@addtoit.com>
    Cc: Jonas Bonn <jonas@southpole.se>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Michal Simek <monstr@monstr.eu>
    Cc: Nicholas Piggin <npiggin@gmail.com>
    Cc: Palmer Dabbelt <palmer@dabbelt.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Paul Walmsley <paul.walmsley@sifive.com>
    Cc: Richard Henderson <rth@twiddle.net>
    Cc: Rich Felker <dalias@libc.org>
    Cc: Russell King <linux@armlinux.org.uk>
    Cc: Sam Ravnborg <sam@ravnborg.org>
    Cc: Stafford Horne <shorne@gmail.com>
    Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Vasily Gorbik <gor@linux.ibm.com>
    Cc: Vineet Gupta <vgupta@kernel.org>
    Cc: WANG Xuerui <kernel@xen0n.name>
    Cc: Will Deacon <will@kernel.org>
    Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    84053271
mmap.c 102 KB