linux-toradex.git/arch/c6x/include/asm, branch v4.4.97

Merge branch 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

2015-10-04T15:31:13+00:00

Pull strscpy string copy function implementation from Chris Metcalf.

Chris sent this during the merge window, but I waffled back and forth on
the pull request, which is why it's going in only now.

The new "strscpy()" function is definitely easier to use and more secure
than either strncpy() or strlcpy(), both of which are horrible nasty
interfaces that have serious and irredeemable problems.

strncpy() has a useless return value, and doesn't NUL-terminate an
overlong result.  To make matters worse, it pads a short result with
zeroes, which is a performance disaster if you have big buffers.

strlcpy(), by contrast, is a mis-designed "fix" for strlcpy(), lacking
the insane NUL padding, but having a differently broken return value
which returns the original length of the source string.  Which means
that it will read characters past the count from the source buffer, and
you have to trust the source to be properly terminated.  It also makes
error handling fragile, since the test for overflow is unnecessarily
subtle.

strscpy() avoids both these problems, guaranteeing the NUL termination
(but not excessive padding) if the destination size wasn't zero, and
making the overflow condition very obvious by returning -E2BIG.  It also
doesn't read past the size of the source, and can thus be used for
untrusted source data too.

So why did I waffle about this for so long?

Every time we introduce a new-and-improved interface, people start doing
these interminable series of trivial conversion patches.

And every time that happens, somebody does some silly mistake, and the
conversion patch to the improved interface actually makes things worse.
Because the patch is mindnumbing and trivial, nobody has the attention
span to look at it carefully, and it's usually done over large swatches
of source code which means that not every conversion gets tested.

So I'm pulling the strscpy() support because it *is* a better interface.
But I will refuse to pull mindless conversion patches.  Use this in
places where it makes sense, but don't do trivial patches to fix things
that aren't actually known to be broken.

* 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  tile: use global strscpy() rather than private copy
  string: provide strscpy()
  Make asm/word-at-a-time.h available on all architectures

mm: clean up per architecture MM hook header files

2015-07-17T23:39:53+00:00

Commit 2ae416b142b6 ("mm: new mm hook framework") introduced an empty
header file (mm-arch-hooks.h) for every architecture, even those which
doesn't need to define mm hooks.

As suggested by Geert Uytterhoeven, this could be cleaned through the use
of a generic header file included via each per architecture
asm/include/Kbuild file.

The PowerPC architecture is not impacted here since this architecture has
to defined the arch_remap MM hook.

Signed-off-by: Laurent Dufour 
Suggested-by: Geert Uytterhoeven 
Acked-by: Geert Uytterhoeven 
Acked-by: Vineet Gupta 
Cc: Oleg Nesterov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Make asm/word-at-a-time.h available on all architectures

2015-07-08T20:41:55+00:00

Added the x86 implementation of word-at-a-time to the
generic version, which previously only supported big-endian.

Omitted the x86-specific load_unaligned_zeropad(), which in
any case is also not present for the existing BE-only
implementation of a word-at-a-time, and is only used under
CONFIG_DCACHE_WORD_ACCESS.

Added as a "generic-y" to the Kbuilds of all architectures
that didn't previously have it.

Signed-off-by: Chris Metcalf

Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block

2015-06-25T22:22:36+00:00

Pull asm/scatterlist.h removal from Jens Axboe:
 "We don't have any specific arch scatterlist anymore, since parisc
  finally switched over.  Kill the include"

* 'for-4.2/sg' of git://git.kernel.dk/linux-block:
  remove scatterlist.h generation from arch Kbuild files
  remove

mm: new mm hook framework

2015-06-25T00:49:41+00:00

CRIU is recreating the process memory layout by remapping the checkpointee
memory area on top of the current process (criu).  This includes remapping
the vDSO to the place it has at checkpoint time.

However some architectures like powerpc are keeping a reference to the
vDSO base address to build the signal return stack frame by calling the
vDSO sigreturn service.  So once the vDSO has been moved, this reference
is no more valid and the signal frame built later are not usable.

This patch serie is introducing a new mm hook framework, and a new
arch_remap hook which is called when mremap is done and the mm lock still
hold.  The next patch is adding the vDSO remap and unmap tracking to the
powerpc architecture.

This patch (of 3):

This patch introduces a new set of header file to manage mm hooks:
- per architecture empty header file (arch/x/include/asm/mm-arch-hooks.h)
- a generic header (include/linux/mm-arch-hooks.h)

The architecture which need to overwrite a hook as to redefine it in its
header file, while architecture which doesn't need have nothing to do.

The default hooks are defined in the generic header and are used in the
case the architecture is not defining it.

In a next step, mm hooks defined in include/asm-generic/mm_hooks.h should
be moved here.

Signed-off-by: Laurent Dufour 
Suggested-by: Andrew Morton 
Cc: "Kirill A. Shutemov" 
Cc: Hugh Dickins 
Cc: Rik van Riel 
Cc: Mel Gorman 
Cc: Pavel Emelyanov 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Michael Ellerman 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

remove scatterlist.h generation from arch Kbuild files

2015-05-19T15:14:34+00:00

Signed-off-by: Christoph Hellwig 
Reported-by: Geert Uytterhoeven 
Signed-off-by: Jens Axboe

Merge tag 'for-linus' of git://linux-c6x.org/git/projects/linux-c6x-upstreaming

2015-04-16T22:48:55+00:00

Pull arch/c6x fixes from Mark Salter.

* tag 'for-linus' of git://linux-c6x.org/git/projects/linux-c6x-upstreaming:
  c6x: platforms: cache: Export symbol L1P_cache_block_invalidate and L1D_cache_block_writeback
  c6x: kernel: setup: Export symbol memory_end
  c6x: kernel: setup: Add screen_info global variable
  c6x: include: asm: Kbuild: Add generic serial.h
  c6x: include: asm: dma-mapping: Add dummy dma_sync_single_range_for_device
  c6x: include: asm: setup: Include "linux/types.h"
  c6x: asm: Add default flat.h according to xtensa architecture
  c6x: kernel: setup: Remove 'const' for local variables in machine_init
  c6x: Makefile: Add -D__linux__
  C6x: time: Ensure consistency in __init
  c6x: kernel: setup: Include "linux/console.h"

arch: Remove exec_domain from remaining archs

2015-04-12T19:03:30+00:00

Signed-off-by: Richard Weinberger

c6x: include: asm: Kbuild: Add generic serial.h

2015-03-26T14:48:26+00:00

Or it will cause building break with allmodconfig:

    CC [M]  drivers/tty/serial/8250/8250_core.o
  drivers/tty/serial/8250/8250_core.c:102:24: fatal error: asm/serial.h: No such file or directory

Signed-off-by: Chen Gang 
Signed-off-by: Mark Salter

c6x: include: asm: dma-mapping: Add dummy dma_sync_single_range_for_device

2015-03-26T14:47:19+00:00

c6x does not implement get_dma_ops() for dma-mapping-common.h. And in
dma-mapping-common.h, dma_sync_single_range_for_device() may be dummy.
So c6x can just define a dummy function for allmodconfig building.

    CC [M]  drivers/net/ethernet/micrel/ks8851.o
  drivers/net/ethernet/micrel/ks8842.c: In function 'ks8842_tx_frame_dma':
  drivers/net/ethernet/micrel/ks8842.c:453:2: error: implicit declaration of function 'dma_sync_single_range_for_device' [-Werror=implicit-function-declaration]
    dma_sync_single_range_for_device(adapter->dev,
    ^

Signed-off-by: Chen Gang 
Signed-off-by: Mark Salter