• Anshuman Khandual's avatar
    mm/special: create generic fallbacks for pte_special() and pte_mkspecial() · 78e7c5af
    Anshuman Khandual authored
    Currently there are many platforms that dont enable ARCH_HAS_PTE_SPECIAL
    but required to define quite similar fallback stubs for special page
    table entry helpers such as pte_special() and pte_mkspecial(), as they
    get build in generic MM without a config check.  This creates two
    generic fallback stub definitions for these helpers, eliminating much
    code duplication.
    
    mips platform has a special case where pte_special() and pte_mkspecial()
    visibility is wider than what ARCH_HAS_PTE_SPECIAL enablement requires.
    This restricts those symbol visibility in order to avoid redefinitions
    which is now exposed through this new generic stubs and subsequent build
    failure.  arm platform set_pte_at() definition needs to be moved into a
    C file just to prevent a build failure.
    
    [anshuman.khandual@arm.com: use defined(CONFIG_ARCH_HAS_PTE_SPECIAL) in mips per Thomas]
      Link: http://lkml.kernel.org/r/1583851924-21603-1-git-send-email-anshuman.khandual@arm.comSigned-off-by: default avatarAnshuman Khandual <anshuman.khandual@arm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Acked-by: Guo Ren <guoren@kernel.org>			[csky]
    Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>	[m68k]
    Acked-by: Stafford Horne <shorne@gmail.com>		[openrisc]
    Acked-by: Helge Deller <deller@gmx.de>			[parisc]
    Cc: Richard Henderson <rth@twiddle.net>
    Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
    Cc: Matt Turner <mattst88@gmail.com>
    Cc: Russell King <linux@armlinux.org.uk>
    Cc: Brian Cain <bcain@codeaurora.org>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: Sam Creasey <sammy@sammy.net>
    Cc: Michal Simek <monstr@monstr.eu>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: Paul Burton <paulburton@kernel.org>
    Cc: Nick Hu <nickhu@andestech.com>
    Cc: Greentime Hu <green.hu@gmail.com>
    Cc: Vincent Chen <deanbo422@gmail.com>
    Cc: Ley Foon Tan <ley.foon.tan@intel.com>
    Cc: Jonas Bonn <jonas@southpole.se>
    Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
    Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Jeff Dike <jdike@addtoit.com>
    Cc: Richard Weinberger <richard@nod.at>
    Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
    Cc: Guan Xuetao <gxt@pku.edu.cn>
    Cc: Chris Zankel <chris@zankel.net>
    Cc: Max Filippov <jcmvbkbc@gmail.com>
    Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
    Link: http://lkml.kernel.org/r/1583802551-15406-1-git-send-email-anshuman.khandual@arm.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    78e7c5af
pgtable.h 20.7 KB