litmus-rt.git/lib/mpi, branch master

MPI: MIPS: Fix compilation error with GCC 5.1

2015-06-13T09:36:41+00:00

This patch fixes mips compilation error:

lib/mpi/generic_mpih-mul1.c: In function 'mpihelp_mul_1':
lib/mpi/longlong.h:651:2: error: impossible constraint in 'asm'

Signed-off-by: Jaedon Shin 
Cc: Linux-MIPS 
Patchwork: https://patchwork.linux-mips.org/patch/10546/
Signed-off-by: Ralf Baechle

MPILIB: Fix comparison of negative MPIs

2015-01-14T16:10:12+00:00

If u and v both represent negative integers and their limb counts
happen to differ, mpi_cmp will always return a positive value - this
is obviously bogus. u is smaller than v if and only if it is larger in
absolute value.

Signed-off-by: Rasmus Villemoes 
Signed-off-by: David Howells 
Acked-by: Dmitry Kasatkin

MPILIB: Fix obvious but harmless typo

2015-01-14T15:16:00+00:00

The macro MPN_COPY_INCR this occurs in isn't used anywhere.

Signed-off-by: Rasmus Villemoes 
Signed-off-by: David Howells

MPILIB: Deobfuscate mpi_cmp

2015-01-14T15:15:57+00:00

The condition preceding 'return 1;' makes my head hurt. At this point,
we know that u and v have the same sign; if they are negative, they
compare opposite to how their absolute values compare (which
mpihelp_cmp found for us), otherwise cmp itself is the
answer. Negating cmp is ok since mpihelp_cmp returns {-1,0,1};
-INT_MIN==INT_MIN won't bite us.

Signed-off-by: Rasmus Villemoes 
Signed-off-by: David Howells 
Acked-by: Dmitry Kasatkin

MPILIB: add module description and license

2013-09-25T16:17:01+00:00

This patch fixes lack of license, otherwise mpi.ko taints kernel.

Signed-off-by: Konstantin Khlebnikov 
Signed-off-by: David Howells

alpha: Modernize lib/mpi/longlong.h

2013-07-19T20:54:23+00:00

Remove the compile warning for __udiv_qrnnd not having a prototype.
Use the __builtin_alpha_umulh introduced in gcc 4.0.

Reviewed-and-Tested-by: Matt Turner 
Signed-off-by: Matt Turner 
Signed-off-by: Richard Henderson

lib/mpi/mpicoder.c: looping issue, need stop when equal to zero, found by 'EXTRA_FLAGS=-W'.

2013-06-12T23:29:44+00:00

For 'while' looping, need stop when 'nbytes == 0', or will cause issue.
('nbytes' is size_t which is always bigger or equal than zero).

The related warning: (with EXTRA_CFLAGS=-W)

  lib/mpi/mpicoder.c:40:2: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]

Signed-off-by: Chen Gang 
Cc: Rusty Russell 
Cc: David Howells 
Cc: James Morris 
Cc: Andy Shevchenko 
Acked-by: David Howells 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

MPILIB: disable usage of floating point registers on parisc

2013-05-24T20:30:11+00:00

The umul_ppmm() macro for parisc uses the xmpyu assembler statement
which does calculation via a floating point register.

But usage of floating point registers inside the Linux kernel are not
allowed and gcc will stop compilation due to the -mdisable-fpregs
compiler option.

Fix this by disabling the umul_ppmm() and udiv_qrnnd() macros. The
mpilib will then use the generic built-in implementations instead.

Signed-off-by: Helge Deller

mpilib: use DIV_ROUND_UP and remove unused macros

2013-02-01T05:28:32+00:00

Remove MIN, MAX and ABS macros that are duplicates kernel's native
implementation.

Signed-off-by: Andy Shevchenko 
Signed-off-by: James Morris

MPI: Fix compilation on MIPS with GCC 4.4 and newer

2012-11-23T17:57:17+00:00

Since 4.4 GCC on MIPS no longer recognizes the "h" constraint,
leading to this build failure:

  CC      lib/mpi/generic_mpih-mul1.o
lib/mpi/generic_mpih-mul1.c: In function 'mpihelp_mul_1':
lib/mpi/generic_mpih-mul1.c:50:3: error: impossible constraint in 'asm'

This patch updates MPI with the latest umul_ppm implementations for MIPS.

Signed-off-by: Manuel Lauss 
Cc: Linux-MIPS 
Cc: Dmitry Kasatkin 
Cc: James Morris 
Patchwork: https://patchwork.linux-mips.org/patch/4612/
Signed-off-by: Ralf Baechle