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  1. 06 Nov, 2013 16 commits
    • Chen Gang's avatar
      arc: remove '__init' for get_hw_config_num_irq() · 4782f7f9
      Chen Gang authored 
      get_hw_config_num_irq() may be called by normal iss_model_init_smp()
which is a function pointer for 'init_smp' which may be called by
first_lines_of_secondary() which also need be normal too.

The related warning (with allmodconfig):

    MODPOST vmlinux.o
  WARNING: vmlinux.o(.text+0x5814): Section mismatch in reference from the function iss_model_init_smp() to the function .init.text:get_hw_config_num_irq()
  The function iss_model_init_smp() references
  the function __init get_hw_config_num_irq().
  This is often because iss_model_init_smp lacks a __init
  annotation or the annotation of get_hw_config_num_irq is wrong.
Signed-off-by: default avatarChen Gang <gang.chen@asianux.com>
      4782f7f9
    • Chen Gang's avatar
      arc: remove '__init' for first_lines_of_secondary() · 8f5d221b
      Chen Gang authored 
      first_lines_of_secondary() is a '__init' function, but it may be called
by __cpu_up() by _cpu_up() by cpu_up() which is a normal export symbol
function. So recommend to remove '__init'.

The related warning (with allmodconfig):

    MODPOST vmlinux.o
  WARNING: vmlinux.o(.text+0x315c): Section mismatch in reference from the function __cpu_up() to the function .init.text:first_lines_of_secondary()
  The function __cpu_up() references
  the function __init first_lines_of_secondary().
  This is often because __cpu_up lacks a __init
  annotation or the annotation of first_lines_of_secondary is wrong.
Signed-off-by: default avatarChen Gang <gang.chen@asianux.com>
      8f5d221b
    • Chen Gang's avatar
      arc: remove '__init' for setup_processor() and arc_init_IRQ() · ef3a661a
      Chen Gang authored 
      They haven't '__init' in definition, but has '__init' in declaration.
And normal function start_kernel_secondary() may call setup_processor()
which will call arc_init_IRQ().

So need remove '__init' for both of them. The related warning (with
allmodconfig):

    MODPOST vmlinux.o
  WARNING: vmlinux.o(.text+0x3084): Section mismatch in reference from the function start_kernel_secondary() to the function .init.text:setup_processor()
  The function start_kernel_secondary() references
  the function __init setup_processor().
  This is often because start_kernel_secondary lacks a __init
  annotation or the annotation of setup_processor is wrong.
Signed-off-by: default avatarChen Gang <gang.chen@asianux.com>
      ef3a661a
    • Chen Gang's avatar
      arc: kgdb: add default implementation for kgdb_roundup_cpus() · 3d01c1ce
      Chen Gang authored 
      arc supports kgdb, but need update -- add function kgdb_roundup_cpus(),
or can not pass compiling. At present, add the simple generic one just
like other architectures(e.g. tile, mips ...).

The related error (with allmodconfig):

  kernel/built-in.o: In function `kgdb_cpu_enter':
  kernel/debug/debug_core.c:580: undefined reference to `kgdb_roundup_cpus'
Signed-off-by: default avatarChen Gang <gang.chen@asianux.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      3d01c1ce
    • Vineet Gupta's avatar
      ARC: Fix bogus gcc warning and micro-optimise TLB iteration loop · 0a4c40a3
      Vineet Gupta authored 
      ```--------------->8----------------------
arch/arc/mm/tlb.c: In function ‘do_tlb_overlap_fault’:
arch/arc/mm/tlb.c:688:13: warning: array subscript is above array bounds
[-Warray-bounds]
         (pd0[n] & PAGE_MASK)) {
             ^
```

--------------->8----------------------

While at it, remove the usless last iteration of outer loop when reading
a TLB SET for duplicate entries.
Suggested-by: default avatarMischa Jonker <mjonker@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      0a4c40a3
    • Vineet Gupta's avatar
      ARC: Add support for irqflags tracing and lockdep · 0dafafc3
      Vineet Gupta authored 
      Lockdep required a small fix to stacktrace API which was incorrectly
unwindign out of __switch_to for the current call frame.
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      0dafafc3
    • Vineet Gupta's avatar
      ARC: Reset the value of Interrupt Priority Register · 54c8bff1
      Vineet Gupta authored 
      In case bootloader has changed the priority of one/more IRQ lines
Reported-by: default avatarNoam Camus <noamc@ezchip.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      54c8bff1
    • Vineet Gupta's avatar
      ARC: Reduce #ifdef'ery for unaligned access emulation · 07ba69a4
      Vineet Gupta authored 
      Emulation not enabled is treated as if the fixup failed, so no need for
special #ifdef checks.
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      07ba69a4
    • Vineet Gupta's avatar
      ARC: Change calling convention of do_page_fault() · 21a63b56
      Vineet Gupta authored 
      switch the args (address, pt_regs) to match with all the other "C"
exception handlers.

This removes the awkwardness in EV_ProtV for page fault vs. unaligned
access.
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      21a63b56
    • Vineet Gupta's avatar
      ARC: cacheflush optim - PTAG can be loop invariant if V-P is const · d4599baf
      Vineet Gupta authored 
      Line op needs vaddr (indexing) and paddr (tag match). For page sized
flushes (V-P const), each line op will need a different index, but the
tag bits wil remain constant, hence paddr can be setup once outside the
loop.

This improves select LMBench numbers for Aliasing dcache where we have
more "preventive" cache flushing.

Processor, Processes - times in microseconds - smaller is better
------------------------------------------------------------------------------
Host                 OS  Mhz null null      open slct sig  sig  fork exec sh
                             call  I/O stat clos TCP  inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
3.11-rc7- Linux 3.11.0-   80 4.66 8.88 69.7 112. 268. 8.60 28.0 3489 13.K 27.K	# Non alias ARC700
3.11-rc7- Linux 3.11.0-   80 4.64 8.51 68.6 98.5 271. 8.58 28.1 4160 15.K 32.K	# Aliasing
3.11-rc7- Linux 3.11.0-   80 4.64 8.51 69.8 99.4 270. 8.73 27.5 3880 15.K 31.K	# PTAG loop Inv
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      d4599baf
    • Vineet Gupta's avatar
      ARC: cacheflush refactor #3: Unify the {d,i}cache flush leaf helpers · bd12976c
      Vineet Gupta authored 
      With Line length being constant now, we can fold the 2 helpers into 1.
This allows applying any optimizations (forthcoming) to single place.
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      bd12976c
    • Vineet Gupta's avatar
      ARC: cacheflush refactor #2: I and D caches lines to have same size · 63d2dfdb
      Vineet Gupta authored 
      Having them be different seems an obscure configuration.
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      63d2dfdb
    • Vineet Gupta's avatar
      ARC: cacheflush refactor #1: push aux reg ascertaining into leaf routine · f3e4de32
      Vineet Gupta authored 
      ARC dcache supports 3 ops - Inv, Flush, Flush-n-Inv.
The programming model however provides 2 commands FLUSH, INV.
INV will either discard or flush-n-discard (based on DT_CTRL bit)

The leaf helper __dc_line_loop() used to take the AUX register
(corresponding to the 2 commands). Now we push that to within the
helper, paving way for code consolidations to follow.
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      f3e4de32
    • Vineet Gupta's avatar
      ARC: use __weak instead of __attribute__((weak)) · 064a6269
      Vineet Gupta authored 
      Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      064a6269
    • Vineet Gupta's avatar
      ARC: Annotate some functions as static · 8e457d6a
      Vineet Gupta authored 
      Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
      8e457d6a
    • Christoph Lameter's avatar
      arc: Replace __get_cpu_var uses · 6855e95c
      Christoph Lameter authored 
      __get_cpu_var() is used for multiple purposes in the kernel source. One of them is
address calculation via the form &__get_cpu_var(x). This calculates the address for
the instance of the percpu variable of the current processor based on an offset.

Other use cases are for storing and retrieving data from the current processors percpu area.
__get_cpu_var() can be used as an lvalue when writing data or on the right side of an assignment.

__get_cpu_var() is defined as :

#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))

__get_cpu_var() always only does an address determination. However, store and retrieve operations
could use a segment prefix (or global register on other platforms) to avoid the address calculation.

this_cpu_write() and this_cpu_read() can directly take an offset into a percpu area and use
optimized assembly code to read and write per cpu variables.

This patch converts __get_cpu_var into either an explicit address calculation using this_cpu_ptr()
or into a use of this_cpu operations that use the offset. Thereby address calcualtions are avoided
and less registers are used when code is generated.

At the end of the patchset all uses of __get_cpu_var have been removed so the macro is removed too.

The patchset includes passes over all arches as well. Once these operations are used throughout then
specialized macros can be defined in non -x86 arches as well in order to optimize per cpu access by
f.e. using a global register that may be set to the per cpu base.

Transformations done to __get_cpu_var()

1. Determine the address of the percpu instance of the current processor.

	DEFINE_PER_CPU(int, y);
	int *x = &__get_cpu_var(y);

    Converts to

	int *x = this_cpu_ptr(&y);

2. Same as #1 but this time an array structure is involved.

	DEFINE_PER_CPU(int, y[20]);
	int *x = __get_cpu_var(y);

    Converts to

	int *x = this_cpu_ptr(y);

3. Retrieve the content of the current processors instance of a per cpu variable.

	DEFINE_PER_CPU(int, u);
	int x = __get_cpu_var(y)

   Converts to

	int x = __this_cpu_read(y);

4. Retrieve the content of a percpu struct

	DEFINE_PER_CPU(struct mystruct, y);
	struct mystruct x = __get_cpu_var(y);

   Converts to

	memcpy(this_cpu_ptr(&x), y, sizeof(x));

5. Assignment to a per cpu variable

	DEFINE_PER_CPU(int, y)
	__get_cpu_var(y) = x;

   Converts to

	this_cpu_write(y, x);

6. Increment/Decrement etc of a per cpu variable

	DEFINE_PER_CPU(int, y);
	__get_cpu_var(y)++

   Converts to

	this_cpu_inc(y)
Acked-by: default avatarVineet Gupta <vgupta@synopsys.com>
Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
      6855e95c
  3. 03 Nov, 2013 3 commits
  5. 02 Nov, 2013 2 commits
  7. 01 Nov, 2013 19 commits
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