linux-toradex.git/include/linux/compiler-gcc.h, branch v2.6.38-rc4

include/linux/compiler-gcc.h: use __same_type() in __must_be_array()

2010-08-10T03:45:04+00:00

We should use the __same_type() helper in __must_be_array().

Signed-off-by: Rusty Russell 
Reported-by: Andrew Morton 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

compiler-gcc.h: gcc-4.5 needs noclone and noinline on __naked functions

2010-06-29T22:29:31+00:00

A __naked function is defined in C but with a body completely implemented
by asm(), including any prologue and epilogue.  These asm() bodies expect
standard calling conventions for parameter passing.  Older GCCs implement
that correctly, but 4.[56] currently do not, see GCC PR44290.  In the
Linux kernel this breaks ARM, causing most arch/arm/mm/copypage-*.c
modules to get miscompiled, resulting in kernel crashes during bootup.

Part of the kernel fix is to augment the __naked function attribute to
also imply noinline and noclone.  This patch implements that, and has been
verified to fix boot failures with gcc-4.5 compiled 2.6.34 and 2.6.35-rc1
kernels.  The patch is a no-op with older GCCs.

Signed-off-by: Mikael Pettersson 
Signed-off-by: Khem Raj 
Cc: Russell King 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

compiler: Introduce __always_unused

2009-11-02T14:47:54+00:00

I wrote some code which is used as compile-time checker, and the
code should be elided after compile.

So I need to annotate the code as "always unused", compared to
"maybe unused".

Signed-off-by: Li Zefan 
Cc: Steven Rostedt 
Cc: Frederic Weisbecker 
Cc: Linus Torvalds 
LKML-Reference: <4AEE2CEC.8040206@cn.fujitsu.com>
Signed-off-by: Ingo Molnar

[ARM] 5421/1: ftrace: fix crash due to tracing of __naked functions

2009-03-12T21:33:03+00:00

This is a fix for the following crash observed in 2.6.29-rc3:
http://lkml.org/lkml/2009/1/29/150

On ARM it doesn't make sense to trace a naked function because then
mcount is called without stack and frame pointer being set up and there
is no chance to restore the lr register to the value before mcount was
called.

Reported-by: Matthias Kaehlcke 
Tested-by: Matthias Kaehlcke 

Cc: Abhishek Sagar 
Cc: Steven Rostedt 
Cc: Ingo Molnar 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Russell King

compiler-gcc.h: add more comments to RELOC_HIDE

2009-01-10T00:54:41+00:00

Requested by C. Lameter

Signed-off-by: Andi Kleen 
Cc: Christoph Lameter 
Cc: Andi Kleen 
Cc: Rusty Russell 
Cc: Stephen Rothwell 
Cc: Mike Travis 
Cc: Ingo Molnar 
Cc: Richard Henderson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Sanitize gcc version header includes

2009-01-02T17:23:03+00:00

 - include the gcc version-dependent header files from the generic gcc
   header file, rather than the other way around (iow: don't make the
   non-gcc header file have to know about gcc versions)

 - don't include compiler-gcc4.h for gcc 5 (for whenever it gets
   released).  That's just confusing and made us do odd things in the
   gcc4 header file (testing that we really had version 4!)

 - generate the name from the __GNUC__ version directly, rather than
   having a mess of #if conditionals.

Signed-off-by: Linus Torvalds

inlining: do not allow gcc below version 4 to optimize inlining

2008-04-30T15:42:49+00:00

fix the condition to match intention: always use the old inlining
behavior on all gcc versions below 4.

this should solve the UML build problem.

Signed-off-by: Ingo Molnar 
Signed-off-by: Linus Torvalds

generic: make optimized inlining arch-opt-in

2008-04-26T15:44:55+00:00

Stephen Rothwell reported that linux-next did not build on powerpc64.

make optimized inlining dependent on architecture opt-in.

Reported-by: Stephen Rothwell 
Signed-off-by: Ingo Molnar

x86: add optimized inlining