1. 19 Dec, 2012 1 commit
  2. 28 Nov, 2012 1 commit
  3. 15 Oct, 2012 2 commits
  4. 05 Oct, 2012 1 commit
    • Jiri Kosina's avatar
      cross-arch: don't corrupt personality flags upon exec() · 16f3e95b
      Jiri Kosina authored
      Historically, the top three bytes of personality have been used for
      things such as ADDR_NO_RANDOMIZE, which made sense only for specific
      architectures.
      
      We now however have a flag there that is general no matter the
      architecture (UNAME26); generally we have to be careful to preserve the
      personality flags across exec().
      
      This patch tries to fix all architectures that forcefully overwrite
      personality flags during exec() (ppc32 and s390 have been fixed recently
      by commits f9783ec8 ("[S390] Do not clobber personality flags on
      exec") and 59e4c3a2 ("powerpc/32: Don't clobber personality flags on
      exec") in a similar way already).
      Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
      Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
      Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Mark Salter <msalter@redhat.com>
      Cc: Mikael Starvik <starvik@axis.com>
      Cc: Jesper Nilsson <jesper.nilsson@axis.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Richard Kuo <rkuo@codeaurora.org>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Michal Simek <monstr@monstr.eu>
      Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
      Cc: Jonas Bonn <jonas@southpole.se>
      Cc: Chen Liqin <liqin.chen@sunplusct.com>
      Cc: Lennox Wu <lennox.wu@gmail.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Zankel <chris@zankel.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      16f3e95b
  5. 04 Oct, 2012 1 commit
    • David Howells's avatar
      UAPI: Fix the guards on various asm/unistd.h files · 89013952
      David Howells authored
      asm-generic/unistd.h and a number of asm/unistd.h files have been given
      reinclusion guards that allow the guard to be overridden if __SYSCALL is
      defined.  Unfortunately, these files define __SYSCALL and don't undefine it
      when they've finished with it, thus rendering the guard ineffective.
      
      The reason for this override is to allow the file to be #included multiple
      times with different settings on __SYSCALL for purposes like generating syscall
      tables.
      
      The following guards are problematic:
      
      arch/arm64/include/asm/unistd.h:#if !defined(__ASM_UNISTD_H) || defined(__SYSCALL)
      arch/arm64/include/asm/unistd32.h:#if !defined(__ASM_UNISTD32_H) || defined(__SYSCALL)
      arch/c6x/include/asm/unistd.h:#if !defined(_ASM_C6X_UNISTD_H) || defined(__SYSCALL)
      arch/hexagon/include/asm/unistd.h:#if !defined(_ASM_HEXAGON_UNISTD_H) || defined(__SYSCALL)
      arch/openrisc/include/asm/unistd.h:#if !defined(__ASM_OPENRISC_UNISTD_H) || defined(__SYSCALL)
      arch/score/include/asm/unistd.h:#if !defined(_ASM_SCORE_UNISTD_H) || defined(__SYSCALL)
      arch/tile/include/asm/unistd.h:#if !defined(_ASM_TILE_UNISTD_H) || defined(__SYSCALL)
      arch/unicore32/include/asm/unistd.h:#if !defined(__UNICORE_UNISTD_H__) || defined(__SYSCALL)
      include/asm-generic/unistd.h:#if !defined(_ASM_GENERIC_UNISTD_H) || defined(__SYSCALL)
      
      On the assumption that the guards' ineffectiveness has passed unnoticed, just
      remove these guards entirely.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      89013952
  6. 03 Oct, 2012 1 commit
  7. 02 Oct, 2012 1 commit
  8. 01 Oct, 2012 2 commits
  9. 27 Sep, 2012 1 commit
    • David Howells's avatar
      Make most arch asm/module.h files use asm-generic/module.h · 786d35d4
      David Howells authored
      Use the mapping of Elf_[SPE]hdr, Elf_Addr, Elf_Sym, Elf_Dyn, Elf_Rel/Rela,
      ELF_R_TYPE() and ELF_R_SYM() to either the 32-bit version or the 64-bit version
      into asm-generic/module.h for all arches bar MIPS.
      
      Also, use the generic definition mod_arch_specific where possible.
      
      To this end, I've defined three new config bools:
      
       (*) HAVE_MOD_ARCH_SPECIFIC
      
           Arches define this if they don't want to use the empty generic
           mod_arch_specific struct.
      
       (*) MODULES_USE_ELF_RELA
      
           Arches define this if their modules can contain RELA records.  This causes
           the Elf_Rela mapping to be emitted and allows apply_relocate_add() to be
           defined by the arch rather than have the core emit an error message.
      
       (*) MODULES_USE_ELF_REL
      
           Arches define this if their modules can contain REL records.  This causes
           the Elf_Rel mapping to be emitted and allows apply_relocate() to be
           defined by the arch rather than have the core emit an error message.
      
      Note that it is possible to allow both REL and RELA records: m68k and mips are
      two arches that do this.
      
      With this, some arch asm/module.h files can be deleted entirely and replaced
      with a generic-y marker in the arch Kbuild file.
      
      Additionally, I have removed the bits from m32r and score that handle the
      unsupported type of relocation record as that's now handled centrally.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarSam Ravnborg <sam@ravnborg.org>
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      786d35d4
  10. 16 May, 2012 1 commit
    • Suresh Siddha's avatar
      fork: move the real prepare_to_copy() users to arch_dup_task_struct() · 55ccf3fe
      Suresh Siddha authored
      Historical prepare_to_copy() is mostly a no-op, duplicated for majority of
      the architectures and the rest following the x86 model of flushing the extended
      register state like fpu there.
      
      Remove it and use the arch_dup_task_struct() instead.
      Suggested-by: default avatarOleg Nesterov <oleg@redhat.com>
      Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
      Link: http://lkml.kernel.org/r/1336692811-30576-1-git-send-email-suresh.b.siddha@intel.comAcked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Chris Zankel <chris@zankel.net>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Mark Salter <msalter@redhat.com>
      Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
      Cc: Mikael Starvik <starvik@axis.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Richard Kuo <rkuo@codeaurora.org>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Michal Simek <monstr@monstr.eu>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Jonas Bonn <jonas@southpole.se>
      Cc: James E.J. Bottomley <jejb@parisc-linux.org>
      Cc: Helge Deller <deller@gmx.de>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Chen Liqin <liqin.chen@sunplusct.com>
      Cc: Lennox Wu <lennox.wu@gmail.com>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
      Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
      55ccf3fe
  11. 08 May, 2012 1 commit
  12. 08 Apr, 2012 1 commit
  13. 28 Mar, 2012 2 commits
  14. 27 Mar, 2011 1 commit
  15. 22 Mar, 2011 1 commit
  16. 26 Oct, 2010 1 commit
  17. 07 Oct, 2010 1 commit
    • David Howells's avatar
      Fix IRQ flag handling naming · df9ee292
      David Howells authored
      Fix the IRQ flag handling naming.  In linux/irqflags.h under one configuration,
      it maps:
      
      	local_irq_enable() -> raw_local_irq_enable()
      	local_irq_disable() -> raw_local_irq_disable()
      	local_irq_save() -> raw_local_irq_save()
      	...
      
      and under the other configuration, it maps:
      
      	raw_local_irq_enable() -> local_irq_enable()
      	raw_local_irq_disable() -> local_irq_disable()
      	raw_local_irq_save() -> local_irq_save()
      	...
      
      This is quite confusing.  There should be one set of names expected of the
      arch, and this should be wrapped to give another set of names that are expected
      by users of this facility.
      
      Change this to have the arch provide:
      
      	flags = arch_local_save_flags()
      	flags = arch_local_irq_save()
      	arch_local_irq_restore(flags)
      	arch_local_irq_disable()
      	arch_local_irq_enable()
      	arch_irqs_disabled_flags(flags)
      	arch_irqs_disabled()
      	arch_safe_halt()
      
      Then linux/irqflags.h wraps these to provide:
      
      	raw_local_save_flags(flags)
      	raw_local_irq_save(flags)
      	raw_local_irq_restore(flags)
      	raw_local_irq_disable()
      	raw_local_irq_enable()
      	raw_irqs_disabled_flags(flags)
      	raw_irqs_disabled()
      	raw_safe_halt()
      
      with type checking on the flags 'arguments', and then wraps those to provide:
      
      	local_save_flags(flags)
      	local_irq_save(flags)
      	local_irq_restore(flags)
      	local_irq_disable()
      	local_irq_enable()
      	irqs_disabled_flags(flags)
      	irqs_disabled()
      	safe_halt()
      
      with tracing included if enabled.
      
      The arch functions can now all be inline functions rather than some of them
      having to be macros.
      
      Signed-off-by: David Howells <dhowells@redhat.com> [X86, FRV, MN10300]
      Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> [Tile]
      Signed-off-by: Michal Simek <monstr@monstr.eu> [Microblaze]
      Tested-by: Catalin Marinas <catalin.marinas@arm.com> [ARM]
      Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> [AVR]
      Acked-by: Tony Luck <tony.luck@intel.com> [IA-64]
      Acked-by: Hirokazu Takata <takata@linux-m32r.org> [M32R]
      Acked-by: Greg Ungerer <gerg@uclinux.org> [M68K/M68KNOMMU]
      Acked-by: Ralf Baechle <ralf@linux-mips.org> [MIPS]
      Acked-by: Kyle McMartin <kyle@mcmartin.ca> [PA-RISC]
      Acked-by: Paul Mackerras <paulus@samba.org> [PowerPC]
      Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [S390]
      Acked-by: Chen Liqin <liqin.chen@sunplusct.com> [Score]
      Acked-by: Matt Fleming <matt@console-pimps.org> [SH]
      Acked-by: David S. Miller <davem@davemloft.net> [Sparc]
      Acked-by: Chris Zankel <chris@zankel.net> [Xtensa]
      Reviewed-by: Richard Henderson <rth@twiddle.net> [Alpha]
      Reviewed-by: Yoshinori Sato <ysato@users.sourceforge.jp> [H8300]
      Cc: starvik@axis.com [CRIS]
      Cc: jesper.nilsson@axis.com [CRIS]
      Cc: linux-cris-kernel@axis.com
      df9ee292
  18. 07 Aug, 2010 1 commit
  19. 09 Jun, 2010 1 commit
    • Peter Zijlstra's avatar
      arch: Implement local64_t · 1996bda2
      Peter Zijlstra authored
      On 64bit, local_t is of size long, and thus we make local64_t an alias.
      On 32bit, we fall back to atomic64_t. (architecture can provide optimized
      32-bit version)
      
      (This new facility is to be used by perf events optimizations.)
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: linux-arch@vger.kernel.org
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      1996bda2
  20. 27 May, 2010 1 commit
    • FUJITA Tomonori's avatar
      asm-generic: remove ISA_DMA_THRESHOLD in scatterlist.h · 204f3a04
      FUJITA Tomonori authored
      This is the first half of the attempt to use asm-generic/scatterlist.h
      on every architecture.
      
      There are only two ways to define scatterlist structure. So it's easy
      to convert every architecture to use asm-generic/scatterlist.h.
      
      This patch:
      
      The trick for ISA_DMA_THRESHOLD in asm-generic/scatterlist.h doesn't work
      for powerpc.  This lets architectures defin ISA_DMA_THRESHOLD.
      
      Hopefully, we can remove ISA_DMA_THRESHOLD in the future; we can do better
      to decide if the bouncing is necessary or not.
      Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: Matt Turner <mattst88@gmail.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      204f3a04
  21. 14 May, 2010 1 commit
  22. 12 Mar, 2010 1 commit
    • Christoph Hellwig's avatar
      ptrace: move user_enable_single_step & co prototypes to linux/ptrace.h · dacbe41f
      Christoph Hellwig authored
      While in theory user_enable_single_step/user_disable_single_step/
      user_enable_blockstep could also be provided as an inline or macro there's
      no good reason to do so, and having the prototype in one places keeps code
      size and confusion down.
      
      Roland said:
      
        The original thought there was that user_enable_single_step() et al
        might well be only an instruction or three on a sane machine (as if we
        have any of those!), and since there is only one call site inlining
        would be beneficial.  But I agree that there is no strong reason to care
        about inlining it.
      
        As to the arch changes, there is only one thought I'd add to the
        record.  It was always my thinking that for an arch where
        PTRACE_SINGLESTEP does text-modifying breakpoint insertion,
        user_enable_single_step() should not be provided.  That is,
        arch_has_single_step()=>true means that there is an arch facility with
        "pure" semantics that does not have any unexpected side effects.
        Inserting a breakpoint might do very unexpected strange things in
        multi-threaded situations.  Aside from that, it is a peculiar side
        effect that user_{enable,disable}_single_step() should cause COW
        de-sharing of text pages and so forth.  For PTRACE_SINGLESTEP, all these
        peculiarities are the status quo ante for that arch, so having
        arch_ptrace() itself do those is one thing.  But for building other
        things in the future, it is nicer to have a uniform "pure" semantics
        that arch-independent code can expect.
      
        OTOH, all such arch issues are really up to the arch maintainer.  As
        of today, there is nothing but ptrace using user_enable_single_step() et
        al so it's a distinction without a practical difference.  If/when there
        are other facilities that use user_enable_single_step() and might care,
        the affected arch's can revisit the question when someone cares about
        the quality of the arch support for said new facility.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Roland McGrath <roland@redhat.com>
      Acked-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      dacbe41f
  23. 20 Feb, 2010 1 commit
    • Russell King's avatar
      MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself · 4b3073e1
      Russell King authored
      On VIVT ARM, when we have multiple shared mappings of the same file
      in the same MM, we need to ensure that we have coherency across all
      copies.  We do this via make_coherent() by making the pages
      uncacheable.
      
      This used to work fine, until we allowed highmem with highpte - we
      now have a page table which is mapped as required, and is not available
      for modification via update_mmu_cache().
      
      Ralf Beache suggested getting rid of the PTE value passed to
      update_mmu_cache():
      
        On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables
        to construct a pointer to the pte again.  Passing a pte_t * is much
        more elegant.  Maybe we might even replace the pte argument with the
        pte_t?
      
      Ben Herrenschmidt would also like the pte pointer for PowerPC:
      
        Passing the ptep in there is exactly what I want.  I want that
        -instead- of the PTE value, because I have issue on some ppc cases,
        for I$/D$ coherency, where set_pte_at() may decide to mask out the
        _PAGE_EXEC.
      
      So, pass in the mapped page table pointer into update_mmu_cache(), and
      remove the PTE value, updating all implementations and call sites to
      suit.
      
      Includes a fix from Stephen Rothwell:
      
        sparc: fix fallout from update_mmu_cache API change
      Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      4b3073e1
  24. 17 Dec, 2009 3 commits
  25. 16 Dec, 2009 1 commit
  26. 12 Dec, 2009 1 commit
  27. 26 Nov, 2009 1 commit
    • Ilya Loginov's avatar
      block: add helpers to run flush_dcache_page() against a bio and a request's pages · 2d4dc890
      Ilya Loginov authored
      Mtdblock driver doesn't call flush_dcache_page for pages in request.  So,
      this causes problems on architectures where the icache doesn't fill from
      the dcache or with dcache aliases.  The patch fixes this.
      
      The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid
      pointless empty cache-thrashing loops on architectures for which
      flush_dcache_page() is a no-op.  Every architecture was provided with this
      flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is
      equal 1 or do nothing otherwise.
      
      See "fix mtd_blkdevs problem with caches on some architectures" discussion
      on LKML for more information.
      Signed-off-by: default avatarIlya Loginov <isloginov@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Peter Horton <phorton@bitbox.co.uk>
      Cc: "Ed L. Cashin" <ecashin@coraid.com>
      Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      2d4dc890
  28. 22 Sep, 2009 2 commits
  29. 16 Sep, 2009 1 commit
  30. 29 Aug, 2009 4 commits
  31. 27 Jun, 2009 1 commit