| f9d4861fc32b995b1616775614459b8f266c803c |
|
20-Jan-2012 |
Will Deacon <will.deacon@arm.com> |
ARM: 7294/1: vectors: use gate_vma for vectors user mapping
The current user mapping for the vectors page is inserted as a `horrible
hack vma' into each task via arch_setup_additional_pages. This causes
problems with the MM subsystem and vm_normal_page, as described here:
https://lkml.org/lkml/2012/1/14/55
Following the suggestion from Hugh in the above thread, this patch uses
the gate_vma for the vectors user mapping, therefore consolidating
the horrible hack VMAs into one.
Acked-and-Tested-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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| ec706dab290c486837d4a825870ab052bf200279 |
|
27-Aug-2010 |
Nicolas Pitre <nico@fluxnic.net> |
ARM: add a vma entry for the user accessible vector page
The kernel makes the high vector page visible to user space. This page
contains (amongst others) small code segments that can be executed in
user space. Make this page visible through ptrace and /proc/<pid>/mem
in order to let gdb perform code parsing needed for proper unwinding.
For example, the ERESTART_RESTARTBLOCK handler actually has a stack
frame -- it returns to a PC value stored on the user's stack. To
unwind after a "sleep" system call was interrupted twice, GDB would
have to recognize this situation and understand that stack frame
layout -- which it currently cannot do.
We could fix this by hard-coding addresses in the vector page range into
GDB, but that isn't really portable as not all of those addresses are
guaranteed to remain stable across kernel releases. And having the gdb
process make an exception for this page and get content from its own
address space for it looks strange, and it is not future proof either.
Being located above PAGE_OFFSET, this vma cannot be deleted by
user space code.
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
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| 11805bcfa411c816b7c76fc40724be6733c74ffc |
|
26-Jan-2010 |
Catalin Marinas <catalin.marinas@arm.com> |
ARM: 5905/1: ARM: Global ASID allocation on SMP
The current ASID allocation algorithm doesn't ensure the notification
of the other CPUs when the ASID rolls over. This may lead to two
processes using the same ASID (but different generation) or multiple
threads of the same process using different ASIDs.
This patch adds the broadcasting of the ASID rollover event to the
other CPUs. To avoid a race on multiple CPUs modifying "cpu_last_asid"
during the handling of the broadcast, the ASID numbering now starts at
"smp_processor_id() + 1". At rollover, the cpu_last_asid will be set
to NR_CPUS.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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| 56f8ba83a52b9f9e3711eff8e54168ac14aa288f |
|
24-Sep-2009 |
Rusty Russell <rusty@rustcorp.com.au> |
cpumask: use mm_cpumask() wrapper: arm
Makes code futureproof against the impending change to mm->cpu_vm_mask.
It's also a chance to use the new cpumask_ ops which take a pointer
(the older ones are deprecated, but there's no hurry for arch code).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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| 9a45f026bb3ba720765d46f62f5c464d3317a8ab |
|
24-Jul-2009 |
Catalin Marinas <catalin.marinas@arm.com> |
nommu: Remove the context.id from asm-offsets.c when !MMU
There is no MMU context switching on MMU-less systems.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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| 87c52578bd050ba395b0cae7079b1128abd2422d |
|
29-Nov-2008 |
Russell King <rmk@dyn-67.arm.linux.org.uk> |
[ARM] Remove linux/sched.h from asm/cacheflush.h and asm/uaccess.h
... and fix those drivers that were incorrectly relying upon
that include.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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| 46097c7dd8bfaf9fb86565b6de45ab5a63afdd53 |
|
10-Aug-2008 |
Russell King <rmk@dyn-67.arm.linux.org.uk> |
[ARM] cachetype: move definitions to separate header
Rather than pollute asm/cacheflush.h with the cache type definitions,
move them to asm/cachetype.h, and include this new header where
necessary.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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| 4baa9922430662431231ac637adedddbb0cfb2d7 |
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02-Aug-2008 |
Russell King <rmk@dyn-67.arm.linux.org.uk> |
[ARM] move include/asm-arm to arch/arm/include/asm
Move platform independent header files to arch/arm/include/asm, leaving
those in asm/arch* and asm/plat* alone.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
|