linux-toradex.git/include/linux/byteorder, branch tegra-10.9.9

byteorder: only use linux/swab.h

2009-01-07T02:10:26+00:00

The first step to make swab.h a regular header that will
include an asm/swab.h with arch overrides.

Avoid the gratuitous differences introduced in the new
linux/swab.h by naming the ___constant_swabXX bits and
__fswabXX bits exactly as found in the old implementation
in byteorder/swab[b].h

Use this new swab.h in byteorder/[big|little]_endian.h and
remove the two old swab headers.

Although the inclusion of asm/byteorder.h looks strange in
linux/swab.h, this will allow each arch to move the actual
arch overrides for the swab bits in an asm file and then
the includes can be cleaned up without requiring a flag day
for all arches at once.

Keep providing __fswabXX in case some userspace was using them
directly, but the revised __swabXX should be used instead in
any new code and will always do constant folding not dependent
on the optimization level, which means the __constant versions
can be phased out in-kernel.

Arches that use the old-style arch macros will lose their
optimized versions until they move to the new style, but at
least they will still compile.  Many arches have already moved
and the patches to move the remaining arches are trivial.

Signed-off-by: Harvey Harrison 
Signed-off-by: Linus Torvalds

byteorder: provide swabb.h generically in asm/byteorder.h

2008-10-20T15:52:40+00:00

This is needed during the transition to the new byteorder headers as the
swabb.h functionality will be provided from asm/byteorder.h in the new
version.  To avoid breakage on arches still using the old implementation,
provide swabb.h from asm/byteorder.h as well.

Signed-off-by: Harvey Harrison 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

endian: Always evaluate arguments.

2008-07-25T16:28:09+00:00

Changeset 7fa897b91a3ea0f16c2873b869d7a0eef05acff4 ("ide: trivial sparse
annotations") created an IDE bootup regression on big-endian systems.

In drivers/ide/ide-iops.c, function ide_fixstring() we now have the
loop:

		for (p = end ; p != s;)
			be16_to_cpus((u16 *)(p -= 2));

which will never terminate on big-endian because in such
a configuration be16_to_cpus() evaluates to "do { } while (0)"

Therefore, always evaluate the arguments to nop endian transformation
operations.

Signed-off-by: David S. Miller 
Signed-off-by: Linus Torvalds

Drop the exporting of empty

2008-04-30T15:29:54+00:00

Fix up the contents of  so that it doesn't export a
content-free generic.h to user space.  This involves:

* Removing the __KERNEL__ tests from generic.h and dropping it from
  Kbuild.
* Wrapping the inclusions of generic.h in both big_endian.h and
  little_endian.h in __KERNEL__ tests.
* Shifting big_endian.h and little_endian.h from header-y to
  unifdef-y in Kbuild.

Signed-off-by: Robert P. J. Day 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

byteorder: move le32_add_cpu & friends from OCFS2 to core

2008-02-08T17:22:32+00:00

This patchset moves le*_add_cpu and be*_add_cpu functions from OCFS2 to core
header (1st), converts ext3 filesystem to this API (2nd) and replaces XFS
different named functions with new ones (3rd).

There are many places where these functions will be useful.  Just look at:
grep -r 'cpu_to_[ble12346]*([ble12346]*_to_cpu.*[-+]' linux-src/ Patch for
ext3 is an example how conversions will probably look like.

This patch:

- move inline functions which add native byte order variable to
  little/big endian variable to core header
  * le16_add_cpu(__le16 *var, u16 val)
  * le32_add_cpu(__le32 *var, u32 val)
  * le64_add_cpu(__le64 *var, u64 val)
  * be32_add_cpu(__be32 *var, u32 val)
- add for completeness:
  * be16_add_cpu(__be16 *var, u16 val)
  * be64_add_cpu(__be64 *var, u64 val)

Signed-off-by: Marcin Slusarz 
Acked-by: Mark Fasheh 
Cc: David Chinner 
Cc: Timothy Shimmin 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Fix compilation of drivers with -O0

2007-05-08T18:15:00+00:00

It is sometimes useful to compile individual drivers with optimization
disabled for easier debugging.  Currently drivers which use htonl() and
similar functions don't compile with -O0.  This patch fixes it.  It also
removes obsolete and misleading comments.  This header is not for
userspace, so we don't have to care about strange programs these comments
mention.

(akpm: -O0 probably isn't a good idea, but this code looks pretty crufty and
unuseful)

Signed-off-by: Michal Schmidt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Fix constant folding and poor optimization in byte swapping code

2007-05-08T18:14:59+00:00

Constant folding does not work for the swabXX() byte swapping functions,
and the C versions optimize poorly.

Attempting to initialize a global variable to swab16(0x1234) or put
something like "case swab32(42):" in a switch statement will not compile.
It can work, swab.h just isn't doing it correctly.  This patch fixes that.

Contrary to the comment in asm-i386/byteorder.h, gcc does not recognize the
"C" version of swab16 and turn it into efficient code.  gcc can do this,
just not with the current code.  The simple function:

u16 foo(u16 x) { return swab16(x); }

Would compile to:
        movzwl  %ax, %eax
        movl    %eax, %edx
        shrl    $8, %eax
        sall    $8, %edx
        orl     %eax, %edx

With this patch, it will compile to:
        rolw    $8, %ax

I also attempted to document the maze different macros/inline functions
that are used to create the final product.

Signed-off-by: Trent Piepho 
Cc: Francois-Rene Rideau 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] cleanup linux/byteorder/swabb.h

2007-02-11T18:51:34+00:00

- no longer a userspace header
- add #include  for in-kernel compilation

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] remove include/linux/byteorder/pdp_endian.h

2007-02-11T18:51:24+00:00

include/linux/byteorder/pdp_endian.h is completely unused, and the comment in
the file itself states that it's both untested and only a proof-of-concept.

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[HEADERS] One line per header in Kbuild files to reduce conflicts

2006-09-19T11:43:58+00:00

Signed-off-by: David Woodhouse