linux-toradex.git/arch/sparc/lib, branch v3.7.6

sparc: Support atomic64_dec_if_positive properly.

2012-11-10T03:37:59+00:00

Sparc32 already supported it, as a consequence of using the
generic atomic64 implementation.  And the sparc64 implementation
is rather trivial.

This allows us to set ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE for all
of sparc, and avoid the annoying warning from lib/atomic64_test.c

Signed-off-by: David S. Miller

sparc64: Niagara-4 bzero/memset, plus use MRU stores in page copy.

2012-10-05T20:45:26+00:00

This adds optimized memset/bzero/page-clear routines for Niagara-4.

We basically can do what powerpc has been able to do for a decade (via
the "dcbz" instruction), which is use cache line clearing stores for
bzero and memsets with a 'c' argument of zero.

As long as we make the cache initializing store to each 32-byte
subblock of the L2 cache line, it works.

As with other Niagara-4 optimized routines, the key is to make sure to
avoid any usage of the %asi register, as reads and writes to it cost
at least 50 cycles.

For the user clear cases, we don't use these new routines, we use the
Niagara-1 variants instead.  Those have to use %asi in an unavoidable
way.

A Niagara-4 8K page clear costs just under 600 cycles.

Add definitions of the MRU variants of the cache initializing store
ASIs.  By default, cache initializing stores install the line as Least
Recently Used.  If we know we're going to use the data immediately
(which is true for page copies and clears) we can use the Most
Recently Used variant, to decrease the likelyhood of the lines being
evicted before they get used.

Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux

2012-10-03T03:02:10+00:00

There's a Niagara 2 memcpy fix in this tree and I have
a Kconfig fix from Dave Jones which requires the sparc-next
changes which went upstream yesterday.

Signed-off-by: David S. Miller

sparc64: Fix trailing whitespace in NG4 memcpy.

2012-09-28T20:08:22+00:00

Signed-off-by: David S. Miller

sparc64: Fix comment type in NG4 copy from user.

2012-09-27T21:26:41+00:00

Noticed by Greg Onufer.

Signed-off-by: David S. Miller

sparc64: Fix return value of Niagara-2 memcpy.

2012-09-27T08:06:43+00:00

It gets clobbered by the kernel's VISEntryHalf, so we have to save it
in a different register than the set clobbered by that macro.

The instance in glibc is OK and doesn't have this problem.

Signed-off-by: David S. Miller

sparc64: Add SPARC-T4 optimized memcpy.

2012-09-27T07:35:11+00:00

		Before		After
		--------------	--------------
bw_tcp:         1288.53 MB/sec	1637.77 MB/sec
bw_pipe:        1517.18 MB/sec	2107.61 MB/sec
bw_unix:        1838.38 MB/sec	2640.91 MB/sec

make -s -j128
allmodconfig	5min 49sec	5min 31sec

Signed-off-by: David S. Miller

sparc64: Add SHA1 driver making use of the 'sha1' instruction.

2012-08-20T22:08:49+00:00

Signed-off-by: David S. Miller 
Acked-by: Herbert Xu

sparc64: Consistently use fsrc2 rather than fmovd in optimized asm.

2012-06-27T08:25:23+00:00

Because fsrc2, unlike fmovd, does not update the %fsr register.

Signed-off-by: David S. Miller

sparc: use the new generic strnlen_user() function

2012-05-26T18:33:54+00:00

This throws away the sparc-specific functions in favor of the generic
optimized version.

Signed-off-by: Linus Torvalds