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  1. 07 10月, 2009 2 次提交
  3. 06 10月, 2009 1 次提交
    • I
      ARM: 5742/1: ARM: add debug check for invalid kernel page faults · 1d212712
      由 Imre Deak 提交于 
      According to the following in arch/arm/mm/fault.c page faults from
kernel mode are invalid if mmap_sem is already held and there is
no exception handler defined for the faulting instruction:

/*
 * As per x86, we may deadlock here.  However, since the kernel only
 * validly references user space from well defined areas of the code,
 * we can bug out early if this is from code which shouldn't.
 */
if (!down_read_trylock(&mm->mmap_sem)) {
	if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc))
		goto no_context;

Since mmap_sem can be held at arbitrary times by another thread this
also means that any page faults from kernel mode are invalid if no
exception handler is defined for them, regardless whether mmap_sem is
held at the time of fault.

To easier detect code that can trigger the above error, add a check
also for the case where mmap_sem is acquired. As this has an overhead
make it a VM debug check.
Signed-off-by: NImre Deak <imre.deak@nokia.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      1d212712
  5. 03 10月, 2009 5 次提交
  7. 02 10月, 2009 3 次提交
  9. 01 10月, 2009 4 次提交
  11. 29 9月, 2009 10 次提交
    • R
      ARM: Ensure do_cache_op takes mmap_sem · aa45ee8f
      由 Russell King 提交于 
      do_cache_op() uses find_vma() to validate its arguments without holding
any locking.  This means that the VMA could vanish beneath us.  Fix
this by taking a read lock on mmap_sem.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      aa45ee8f
    • R
      ARM: Fix __cpuexit section mismatch warnings · 90140c30
      由 Russell King 提交于 
      Fix:

WARNING: vmlinux.o(.text+0x247c): Section mismatch in reference from the function cpu_idle() to the function .cpuexit.text:cpu_die()
The function cpu_idle() references a function in an exit section.
Often the function cpu_die() has valid usage outside the exit section
and the fix is to remove the __cpuexit annotation of cpu_die.

WARNING: vmlinux.o(.cpuexit.text+0x3c): Section mismatch in reference from the function cpu_die() to the function .cpuinit.text:secondary_start_kernel()
The function __cpuexit cpu_die() references
a function __cpuinit secondary_start_kernel().
This is often seen when error handling in the exit function
uses functionality in the init path.
The fix is often to remove the __cpuinit annotation of
secondary_start_kernel() so it may be used outside an init section.

Sam says:
> The annotation of cpu_die() is wrong.
> To be annotated __cpuexit the function shall:
> - be used in exit context and only in exit context with HOTPLUG_CPU=n
> - be used outside exit context with HOTPLUG_CPU=y

So, this also means __cpu_disable(), __cpu_die() and twd_timer_stop() are
also wrong.  However, removing __cpuexit from cpu_die() creates:

WARNING: vmlinux.o(.text+0x6834): Section mismatch in reference from the function cpu_die() to the function .cpuinit.text:secondary_start_kernel()
The function cpu_die() references
the function __cpuinit secondary_start_kernel().
This is often because cpu_die lacks a __cpuinit
annotation or the annotation of secondary_start_kernel is wrong.

so fix this using __ref.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
      90140c30
    • R
      ARM: Don't allow highmem on SMP platforms without h/w TLB ops broadcast · e616c591
      由 Russell King 提交于 
      We suffer an unfortunate combination of "features" which makes highmem
support on platforms without hardware TLB maintainence broadcast difficult:

- we need kmap_high_get() support for DMA cache coherence
- this requires kmap_high() to take a spinlock with IRQs disabled
- kmap_high() occasionally calls flush_all_zero_pkmaps() to clear
  out old mappings
- flush_all_zero_pkmaps() calls flush_tlb_kernel_range(), which
  on s/w IPI'd systems eventually calls smp_call_function_many()
- smp_call_function_many() must not be called with IRQs disabled:

WARNING: at kernel/smp.c:380 smp_call_function_many+0xc4/0x240()
Modules linked in:
Backtrace:
[<c00306f0>] (dump_backtrace+0x0/0x108) from [<c0286e6c>] (dump_stack+0x18/0x1c)
 r6:c007cd18 r5:c02ff228 r4:0000017c
[<c0286e54>] (dump_stack+0x0/0x1c) from [<c0053e08>] (warn_slowpath_common+0x50/0x80)
[<c0053db8>] (warn_slowpath_common+0x0/0x80) from [<c0053e50>] (warn_slowpath_null+0x18/0x1c)
 r7:00000003 r6:00000001 r5:c1ff4000 r4:c035fa34
[<c0053e38>] (warn_slowpath_null+0x0/0x1c) from [<c007cd18>] (smp_call_function_many+0xc4/0x240)
[<c007cc54>] (smp_call_function_many+0x0/0x240) from [<c007cec0>] (smp_call_function+0x2c/0x38)
[<c007ce94>] (smp_call_function+0x0/0x38) from [<c005980c>] (on_each_cpu+0x1c/0x38)
[<c00597f0>] (on_each_cpu+0x0/0x38) from [<c0031788>] (flush_tlb_kernel_range+0x50/0x58)
 r6:00000001 r5:00000800 r4:c05f3590
[<c0031738>] (flush_tlb_kernel_range+0x0/0x58) from [<c009c600>] (flush_all_zero_pkmaps+0xc0/0xe8)
[<c009c540>] (flush_all_zero_pkmaps+0x0/0xe8) from [<c009c6b4>] (kmap_high+0x8c/0x1e0)
[<c009c628>] (kmap_high+0x0/0x1e0) from [<c00364a8>] (kmap+0x44/0x5c)
[<c0036464>] (kmap+0x0/0x5c) from [<c0109dfc>] (cramfs_readpage+0x3c/0x194)
[<c0109dc0>] (cramfs_readpage+0x0/0x194) from [<c0090c14>] (__do_page_cache_readahead+0x1f0/0x290)
[<c0090a24>] (__do_page_cache_readahead+0x0/0x290) from [<c0090ce4>] (ra_submit+0x30/0x38)
[<c0090cb4>] (ra_submit+0x0/0x38) from [<c0089384>] (filemap_fault+0x3dc/0x438)
 r4:c1819988
[<c0088fa8>] (filemap_fault+0x0/0x438) from [<c009d21c>] (__do_fault+0x58/0x43c)
[<c009d1c4>] (__do_fault+0x0/0x43c) from [<c009e8cc>] (handle_mm_fault+0x104/0x318)
[<c009e7c8>] (handle_mm_fault+0x0/0x318) from [<c0033c98>] (do_page_fault+0x188/0x1e4)
[<c0033b10>] (do_page_fault+0x0/0x1e4) from [<c0033ddc>] (do_translation_fault+0x7c/0x84)
[<c0033d60>] (do_translation_fault+0x0/0x84) from [<c002b474>] (do_DataAbort+0x40/0xa4)
 r8:c1ff5e20 r7:c0340120 r6:00000805 r5:c1ff5e54 r4:c03400d0
[<c002b434>] (do_DataAbort+0x0/0xa4) from [<c002bcac>] (__dabt_svc+0x4c/0x60)
...

So we disable highmem support on these systems.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      e616c591
    • J
      ARM: includecheck fix: mach-davinci, board-dm365-evm.c · 9a0f6b46
      由 Jaswinder Singh Rajput 提交于 
      fix the following 'make includecheck' warning:

  arch/arm/mach-davinci/board-dm365-evm.c: mach/common.h is included more than once.
Signed-off-by: NJaswinder Singh Rajput <jaswinderrajput@gmail.com>
Acked-by: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      9a0f6b46
    • J
      ARM: Remove unused CONFIG SA1100_H3XXX · d5fc79cc
      由 Jaswinder Singh Rajput 提交于 
      Removed unused CONFIG SA1100_H3XXX from Kconfig and defconfig
Reported-by: NRobert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: NJaswinder Singh Rajput <jaswinderrajput@gmail.com>
Acked-by: NDmitry Artamonow <mad_soft@inbox.ru>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Cc: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      d5fc79cc
    • R
      ARM: Fix warning: unused variable 'highmem' · 041d785f
      由 Russell King 提交于 
      Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      041d785f
    • R
      ARM: Fix warning: #warning syscall migrate_pages not implemented · d80ade7b
      由 Russell King 提交于 
      We're not implementing this syscall (we're not NUMA) so we might as
well silence this warning.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      d80ade7b
    • R
      ARM: Fix SA11x0 clocksource warning · fac28e6d
      由 Russell King 提交于 
      8e19608e missed updating SA11x0, and thus:

arch/arm/mach-sa1100/time.c:88: warning: initialization from incompatible pointer type
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      fac28e6d
    • R
      ARM: Fix section mismatch warning in Integrator pci_v3 · 7f8b7170
      由 Russell King 提交于 
      WARNING: vmlinux.o(.text+0xc9d4): Section mismatch in reference from the function pci_v3_scan_bus() to the function .devinit.text:pci_scan_bus_parented()
The function pci_v3_scan_bus() references
the function __devinit pci_scan_bus_parented().
This is often because pci_v3_scan_bus lacks a __devinit
annotation or the annotation of pci_scan_bus_parented is wrong.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
      7f8b7170
    • H
      omap: Fix wrong condition check in while loop for mailbox and iommu2 · 055c49d2
      由 Hiroshi DOYU 提交于 
      It's worked fine so far since reset is done for the first time.
Reported-by: NJuha Leppanen <juha_motorsportcom@luukku.com>
Signed-off-by: NHiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: NJuha Leppanen <juha_motorsportcom@luukku.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>
      055c49d2
  13. 27 9月, 2009 1 次提交
  15. 25 9月, 2009 11 次提交
  17. 24 9月, 2009 3 次提交