linux-toradex.git/include/linux/compiler.h, branch v2.6.25-rc2

remove __attribute_used__

2008-01-28T22:21:18+00:00

Remove the deprecated __attribute_used__.

[Introduce __section in a few places to silence checkpatch /sam]

Signed-off-by: Adrian Bunk 
Signed-off-by: Sam Ravnborg

compiler.h: introduce __section()

2008-01-28T22:21:17+00:00

Add a new helper: __section() that makes a section definition
much shorter and more readable.

Signed-off-by: Sam Ravnborg

Permit silencing of __deprecated warnings.

2007-10-25T22:10:17+00:00

The __deprecated marker is quite useful in highlighting the remnants of
old APIs that want removing.

However, it is quite normal for one or more years to pass, before the
(usually ancient, bitrotten) code in question is either updated or
deleted.

Thus, like __must_check, add a Kconfig option that permits the silencing
of this compiler warning.

This change mimics the ifdef-ery and Kconfig defaults of MUST_CHECK as
closely as possible.

Signed-off-by: Jeff Garzik 
Signed-off-by: Linus Torvalds

Replace __attribute_pure with pure

2007-10-18T21:37:32+00:00

To be consistent with the use of attributes in the rest of the kernel
replace all use of __attribute_pure__ with __pure and delete the definition
of __attribute_pure__.

Signed-off-by: Ralf Baechle 
Cc: Russell King 
Acked-by: Mauro Carvalho Chehab 
Cc: Bryan Wu 
Cc: Paul Mackerras 
Cc: Benjamin Herrenschmidt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

make __chk_{user,io}_ptr() accept pointers to volatile

2007-07-26T18:11:57+00:00

Signed-off-by: Al Viro 
Signed-off-by: Linus Torvalds

x86: Support attribute((cold)) in gcc 4.3

2007-07-22T01:37:08+00:00

gcc 4.3 supports a new __attribute__((__cold__)) to mark functions cold. Any
path directly leading to a call of this function will be unlikely. And gcc
will try to generate smaller code for the function itself.

Please use with care. The code generation advantage isn't large and in most
cases it is not worth uglifying code with this.

This patch marks some common error functions like panic(), printk()
as cold.  This will longer term make many unlikely()s unnecessary, although
we can keep them for now for older compilers.

BUG is not marked cold because there is currently no way to tell
gcc to mark a inline function told.

Also all __init and __exit functions are marked cold. With a non -Os
build this will tell the compiler to generate slightly smaller code
for them. I think it currently only uses less alignments for labels,
but that might change in the future.

One disadvantage over *likely() is that they cannot be easily instrumented
to verify them.

Another drawback is that only the latest gcc 4.3 snapshots support this.
Unfortunately we cannot detect this using the preprocessor. This means older
snapshots will fail now. I don't think that's a problem because they are
unreleased compilers that nobody should be using.

gcc also has a __hot__ attribute, but I don't see any sense in using
this in the kernel right now. But someday I hope gcc will be able
to use more aggressive optimizing for hot functions even in -Os,
if that happens it should be added.

Includes compile fix from Thomas Gleixner.

Cc: Jan Hubicka 
Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

x86_64: Support gcc 5 properly

2007-05-21T16:56:57+00:00

The ifdef tests were broken.  Assume it acts like gcc 4

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

compiler: introduce used and maybe_unused

2007-05-09T19:30:56+00:00

__used is defined to be __attribute__((unused)) for all pre-3.3 gcc
compilers to suppress warnings for unused functions because perhaps they
are referenced only in inline assembly.  It is defined to be
__attribute__((used)) for gcc 3.3 and later so that the code is still
emitted for such functions.

__maybe_unused is defined to be __attribute__((unused)) for both function
and variable use if it could possibly be unreferenced due to the evaluation
of preprocessor macros.  Function prototypes shall be marked with
__maybe_unused if the actual definition of the function is dependant on
preprocessor macros.

No update to compiler-intel.h is necessary because ICC supports both
__attribute__((used)) and __attribute__((unused)) as specified by the gcc
manual.

__attribute_used__ is deprecated and will be removed once all current
code is converted to using __used.

Cc: Rusty Russell 
Cc: Adrian Bunk 
Signed-off-by: David Rientjes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Add const to pointer qualifiers for __chk_user_ptr and __chk_io_ptr.

2007-03-26T21:23:52+00:00

Change prototypes for __chk_user_ptr and __chk_io_ptr to take const
void* instead of void*, so that code can pass "const void *" to them.

(Right now sparse does not warn about passing const void* to void*
functions, but that is a separate bug that I believe Josh is working on,
and once sparse does check this, the changed prototypes will be
necessary.)

Signed-off-by: Russ Cox 
Signed-off-by: Josh Triplett 
Acked-by: Christopher Li 
Signed-off-by: Linus Torvalds

include/linux/compiler.h: reject gcc 3 < gcc 3.2

2006-12-12T18:28:50+00:00

The kernel doesn't compile with GCC <3.2, do not allow it to succeed if GCC
3.0.x or 3.1.x are used.

Signed-off-by: Alistair John Strachan 
Signed-off-by: Adrian Bunk