linux.git/arch/tile/lib, branch v2.6.37

arch/tile: fix memchr() not to dereference memory for zero length

2010-11-24T18:57:42+00:00

This change fixes a bug that memchr() will read the first word
of the source even if the length is zero.  Ironically, the code
was originally written with a test to avoid exactly this problem,
but to make the code conform to Linux coding standards with all
declarations preceding all statements, the first load from memory
was moved up above that test as the initial value for a variable.

The change just moves all the variable declarations to the top
of the file, with no initializers, so that the test can also be
at the top of the file.

Signed-off-by: Chris Metcalf

arch/tile: fix rwlock so would-be write lockers don't block new readers

2010-11-15T14:18:49+00:00

This avoids a deadlock in the IGMP code where one core gets a read
lock, another core starts trying to get a write lock (thus blocking
new readers), and then the first core tries to recursively re-acquire
the read lock.

We still try to preserve some degree of balance by giving priority
to additional write lockers that come along while the lock is held
for write, so they can all complete quickly and return the lock to
the readers.

Signed-off-by: Chris Metcalf

arch/tile: complete migration to new kmap_atomic scheme

2010-11-01T19:30:36+00:00

This change makes KM_TYPE_NR independent of the actual deprecated
list of km_type values, which are no longer used in tile code anywhere.
For now we leave it set to 8, allowing that many nested mappings,
and thus reserving 32MB of address space.

A few remaining places using KM_* values were cleaned up as well.

Signed-off-by: Chris Metcalf

arch/tile: minor whitespace/naming changes for string support files

2010-10-15T19:38:54+00:00

Our internal process shares memcpy, memset, etc., with libc, and
we did some minor tweaking as part of moving from uclibc to glibc,
which is now reflected in the kernel versions of these files.

There are no semantic changes in this commit, just whitespace
(memcpy_32.S now properly uses tabs), naming (memmove.c instead
of memmove_32.c, since TILE-Gx shares the file with TILEPro),
and a couple of other minor tweaks.

Signed-off-by: Chris Metcalf

arch/tile: properly export __mb_incoherent for modules

2010-10-14T19:12:55+00:00

Signed-off-by: Chris Metcalf

tile: replace some BUG_ON checks with BUILD_BUG_ON checks

2010-10-05T16:49:35+00:00

Some BUG_ON checks can be detected at compile time rather than
at runtime.

Signed-off-by: Akinobu Mita 
Signed-off-by: Chris Metcalf

arch/tile: Various cleanups.

2010-08-13T12:52:19+00:00

This change rolls up random cleanups not representing any actual bugs.

- Remove a stale CONFIG_ value from the default tile_defconfig
- Remove unused tns_atomic_xxx() family of methods from 
- Optimize get_order() using Tile's "clz" instruction
- Fix a bad hypervisor upcall name (not currently used in Linux anyway)
- Use __copy_in_user_inatomic() name for consistency, and export it
- Export some additional hypervisor driver I/O upcalls and some homecache calls
- Remove the obfuscating MEMCPY_TEST_WH64 support code
- Other stray comment cleanups, #if 0 removal, etc.

Signed-off-by: Chris Metcalf

arch/tile: Miscellaneous cleanup changes.

2010-07-06T17:41:51+00:00

This commit is primarily changes caused by reviewing "sparse"
and "checkpatch" output on our sources, so is somewhat noisy, since
things like "printk() -> pr_err()" (or whatever) throughout the
codebase tend to get tedious to read.  Rather than trying to tease
apart precisely which things changed due to which type of code
review, this commit includes various cleanups in the code:

- sparse: Add declarations in headers for globals.
- sparse: Fix __user annotations.
- sparse: Using gfp_t consistently instead of int.
- sparse: removing functions not actually used.
- checkpatch: Clean up printk() warnings by using pr_info(), etc.;
  also avoid partial-line printks except in bootup code.
  - checkpatch: Use exposed structs rather than typedefs.
  - checkpatch: Change some C99 comments to C89 comments.

In addition, a couple of minor other changes are rolled in
to this commit:

- Add support for a "raise" instruction to cause SIGFPE, etc., to be raised.
- Remove some compat code that is unnecessary when we fully eliminate
  some of the deprecated syscalls from the generic syscall ABI.
- Update the tile_defconfig to reflect current config contents.

Signed-off-by: Chris Metcalf 
Acked-by: Arnd Bergmann

arch/tile: Split the icache flush code off to a generic header.

2010-07-06T17:41:46+00:00

This code is used in other places in our system than in Linux, so
to share it we now implement it as an inline function in our low-level
 headers, and instantiate it in one file in Linux's arch/tile/lib.
The file is now cacheflush.c and is C code rather than the strangely-named
and assembler-implemented __invalidate_icache.S.

Signed-off-by: Chris Metcalf 
Acked-by: Arnd Bergmann

arch/tile: Fix bug in support for atomic64_xx() ops.

2010-07-06T17:41:39+00:00

This wasn't properly tested until the perf-event subsystem started
to get brought up under the tile architecture.

The bug caused bogus atomic64_cmpxchg() values to be returned,
among other things.

Signed-off-by: Chris Metcalf 
Acked-by: Arnd Bergmann