linux.git/include/asm-mips/bitops.h, branch master

MIPS: Move headfiles to new location below arch/mips/include

2008-10-11T15:18:52+00:00

Signed-off-by: Ralf Baechle

[MIPS] Tinker with constraints in to fix build error.

2008-07-20T13:38:18+00:00

[...]
  CC      init/main.o
include/asm/bitops.h: In function `start_kernel':
include/asm/bitops.h:76: warning: asm operand 2 probably doesn't match
constraints
include/asm/bitops.h:76: warning: asm operand 2 probably doesn't match
constraints
include/asm/bitops.h:76: warning: asm operand 2 probably doesn't match
constraints
include/asm/bitops.h:76: error: impossible constraint in `asm'
include/asm/bitops.h:76: error: impossible constraint in `asm'
include/asm/bitops.h:76: error: impossible constraint in `asm'
make[1]: *** [init/main.o] Error 1
[...]

The build error is caused by the ages old gcc bug where gcc at the time of
analyzing the constraints is unable to figure out that an "i" constraint
actually can be satisfied and thus will abort unless an "r" is added to
the constraint.  For the actual code generation gcc will only ever use the
"i" constraint.

Signed-off-by: Ralf Baechle

[MIPS] Fix asm constraints for 'ins' instructions.

2008-07-15T17:44:30+00:00

The third operand to 'ins' must be a constant int, not a register.

[Ralf: The bug was actually intensional.  Some versions used to throw an
error under certain circumstances for code like:

static inline void f(unsigned nr, unsigned *p)
{
	unsigned short bit = nr & 5;

	if (__builtin_constant_p(bit)) {
		__asm__ __volatile__ ("  foo %0, %1" : "=m" (*p) : "i" (bit));
  	} else {
		/* Do something else. */
	}
}

because gcc was not able to figure out that the "i" constraint was possibly
at the early stage when the constraint are getting verified.  The solution
was using "ri" instead of "i".  The "ri" would keep gcc happy but in the
end for code generation always the "i" constraint would be satisfied.  The
problem afair originally appeared in the i386 io.h and also hit it's mips
equivalent.  From there the workaround spread to many of the inline
assembler functions.]

Signed-off-by: David Daney 
Signed-off-by: Ralf Baechle

[MIPS] Get rid of __ilog2

2008-05-12T15:46:55+00:00

56a6b1eb7bfb5ace0b5cb9c149f502fbd101b8ab was a bit too conservative and
left __ilog2 around which is only used as an internal function for other
bitops.

Signed-off-by: Ralf Baechle

[MIPS] Fix __fls for non-MIPS32/MIPS64 cpus

2008-05-12T15:46:55+00:00

Only MIPS32 and MIPS64 CPUs implement clz/dclz. Therefore don't export
__ilog2() for non MIPS32/MIPS64 cpus and use generic __fls bitop code for
these cpus.

Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Ralf Baechle

generic: implement __fls on all 64-bit archs

2008-04-26T17:21:16+00:00

Implement __fls on all 64-bit archs:

alpha has an implementation of fls64.
	Added __fls(x) = fls64(x) - 1.

ia64 has fls, but not __fls.
	Added __fls based on code of fls.

mips and powerpc have __ilog2, which is the same as __fls.
	Added __fls = __ilog2.

parisc, s390, sh and sparc64:
	Include generic __fls.

x86_64 already has __fls.

Signed-off-by: Alexander van Heukelum 
Signed-off-by: Ingo Molnar

forbid asm/bitops.h direct inclusion

2007-10-19T18:53:41+00:00

forbid asm/bitops.h direct inclusion

Because of compile errors that may occur after bit changes if asm/bitops.h is
included directly without e.g.  linux/kernel.h which includes linux/bitops.h,
forbid direct inclusion of asm/bitops.h.  Thanks to Adrian Bunk.

Signed-off-by: Jiri Slaby 
Cc: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mips: lock bitops

2007-10-18T21:37:29+00:00

mips can avoid one mb when acquiring a lock with test_and_set_bit_lock.

Signed-off-by: Nick Piggin 
Cc: Ralf Baechle 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mips: fix bitops

2007-10-18T21:37:29+00:00

Documentation/atomic_ops.txt defines these primitives must contain a memory
barrier both before and after their memory operation.  This is consistent with
the atomic ops implementation on mips.

Signed-off-by: Nick Piggin 
Cc: Ralf Baechle 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

bitops: introduce lock ops

2007-10-18T21:37:29+00:00

Introduce test_and_set_bit_lock / clear_bit_unlock bitops with lock semantics.
Convert all architectures to use the generic implementation.

Signed-off-by: Nick Piggin 
Acked-By: David Howells 
Cc: Richard Henderson 
Cc: Ivan Kokshaysky 
Cc: Russell King 
Cc: Haavard Skinnemoen 
Cc: Bryan Wu 
Cc: Mikael Starvik 
Cc: David Howells 
Cc: Yoshinori Sato 
Cc: "Luck, Tony" 
Cc: Hirokazu Takata 
Cc: Geert Uytterhoeven 
Cc: Roman Zippel 
Cc: Greg Ungerer 
Cc: Ralf Baechle 
Cc: Kyle McMartin 
Cc: Matthew Wilcox 
Cc: Paul Mackerras 
Cc: Benjamin Herrenschmidt 
Cc: Heiko Carstens 
Cc: Martin Schwidefsky 
Cc: Paul Mundt 
Cc: Kazumoto Kojima 
Cc: Richard Curnow 
Cc: William Lee Irwin III 
Cc: "David S. Miller" 
Cc: Jeff Dike 
Cc: Paolo 'Blaisorblade' Giarrusso 
Cc: Miles Bader 
Cc: Andi Kleen 
Cc: Chris Zankel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds