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  1. 19 8月, 2010 1 次提交
  3. 18 8月, 2010 1 次提交
    • D
      sparc64: Make rwsems 64-bit. · 9b3bb86a
      由 David S. Miller 提交于 
      Basically tip-off the powerpc code, use a 64-bit type and atomic64_t
interfaces for the implementation.

This gets us off of the by-hand asm code I wrote, which frankly I
think probably ruins I-cache hit rates.

The idea was the keep the call chains less deep, but anything taking
the rw-semaphores probably is also calling other stuff and therefore
already has allocated a stack-frame.  So no real stack frame savings
ever.

Ben H. has posted patches to make powerpc use 64-bit too and with some
abstractions we can probably use a shared header file somewhere.

With suggestions from Sam Ravnborg.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      9b3bb86a
  5. 14 4月, 2010 1 次提交
  7. 13 4月, 2010 4 次提交
  9. 11 12月, 2009 2 次提交
  11. 09 12月, 2009 1 次提交
  13. 27 11月, 2009 1 次提交
  15. 07 11月, 2009 1 次提交
  17. 30 5月, 2009 1 次提交
  19. 09 2月, 2009 2 次提交
    • D
      sparc64: Fix probe_kernel_{read,write}(). · aeb39876
      由 David S. Miller 提交于 
      This is based upon a report from Chris Torek and his initial patch.
From Chris's report:

--------------------
This came up in testing kgdb, using the built-in tests -- turn
on CONFIG_KGDB_TESTS, then

    echo V1 > /sys/module/kgdbts/parameters/kgdbts

-- but it would affect using kgdb if you were debugging and looking
at bad pointers.
--------------------

When we get a copy_{from,to}_user() request and the %asi is set to
something other than ASI_AIUS (which is userspace) then we branch off
to a routine called memcpy_user_stub().  It just does a straight
memcpy since we are copying from kernel to kernel in this case.

The logic was that since source and destination are both kernel
pointers we don't need to have exception checks.

But for what probe_kernel_{read,write}() is trying to do, we have to
have the checks, otherwise things like kgdb bad kernel pointer
accesses don't do the right thing.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      aeb39876
    • D
      sparc64: Kill .fixup section bloat. · 40bdac7d
      由 David S. Miller 提交于 
      This is an implementation of a suggestion made by Chris Torek:
--------------------
Something else I noticed in passing: the EX and EX_LD/EX_ST macros
scattered throughout the various .S files make a fair bit of .fixup
code, all of which does the same thing.  At the cost of one symbol
in copy_in_user.S, you could just have one common two-instruction
retl-and-mov-1 fixup that they all share.
--------------------

The following is with a defconfig build:

   text	   data	    bss	    dec	    hex	filename
3972767	 344024	 584449	4901240	 4ac978	vmlinux.orig
39688877	 344024	 584449	4897360	 4aba50	vmlinux
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      40bdac7d
  21. 18 1月, 2009 1 次提交
    • S
      sparc64: fix modpost failure · 62dfcd33
      由 Sam Ravnborg 提交于 
      Previously PeeCeeI.o was a library but it
was always pulled in due to insw and friends being exported
(at least for a modular kernel).

But this resulted in modpost failures if there where no in-kernel
users because then insw & friends were not linked in.

Fix this by including PeeCeeI.o in the kernel unconditionally.

The only drawback for this solution is that a nonmodular kernel
will always include insw & friends no matter if they are in use or not.
Reported-by: NMeelis Roos <mroos@linux.ee>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      62dfcd33
  23. 09 1月, 2009 2 次提交
  25. 09 12月, 2008 3 次提交
  27. 05 12月, 2008 2 次提交
  29. 20 5月, 2008 1 次提交
  31. 29 4月, 2008 1 次提交
  33. 01 2月, 2008 1 次提交
  35. 27 8月, 2007 1 次提交
  37. 25 7月, 2007 1 次提交
    • A
      [SPARC32]: Fix bug in sparc optimized memset. · f61698e6
      由 Alexander Shmelev 提交于 
      Sparc optimized memset (arch/sparc/lib/memset.S) does not fill last
byte of the memory area, if area size is less than 8 bytes and start
address is not word (4-bytes) aligned.

Here is code chunk where bug located:
/* %o0 - memory address, %o1 - size, %g3 - value */
8:
     add    %o0, 1, %o0
    subcc    %o1, 1, %o1
    bne,a    8b
     stb %g3, [%o0 - 1]

This code should write byte every loop iteration, but last time delay
instruction stb is not executed because branch instruction sets
"annul" bit.

Patch replaces bne,a by bne instruction.

Error can be reproduced by simple kernel module:

--------------------
#include <linux/module.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <string.h>

static void do_memset(void **p, int size)
{
        memset(p, 0x00, size);
}

static int __init memset_test_init(void)
{
    char fooc[8];
    int *fooi;
    memset(fooc, 0xba, sizeof(fooc));

    do_memset((void**)(fooc + 3), 1);

    fooi = (int*) fooc;
    printk("%08X %08X\n", fooi[0], fooi[1]);

    return -1;
}

static void __exit memset_test_cleanup(void)
{
    return;
}

module_init(memset_test_init);
module_exit(memset_test_cleanup);

MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
--------------------
Signed-off-by: NAlexander Shmelev <ashmelev@task.sun.mcst.ru>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      f61698e6
  39. 31 5月, 2007 1 次提交
  41. 29 5月, 2007 1 次提交
  43. 09 5月, 2007 1 次提交
  45. 27 3月, 2007 1 次提交
  47. 18 12月, 2006 1 次提交
  49. 09 10月, 2006 1 次提交
    • A
      [PATCH] sparc32 rwlock fix · 7a39f522
      由 Al Viro 提交于 
      read_trylock() is broken on sparc32 (doesn't build and didn't work
right, actually).  Proposed fix:

 - make "writer holds lock" distinguishable from "reader tries to grab
   lock"

 - have __raw_read_trylock() try to acquire the mutex (in LSB of lock),
   terminating spin if we see that there's writer holding it.  Then do
   the rest as we do in read_lock().

Thanks to Ingo for discussion...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      7a39f522
  51. 30 9月, 2006 1 次提交
  53. 01 7月, 2006 1 次提交
  55. 26 6月, 2006 1 次提交
  57. 13 12月, 2005 1 次提交
  59. 14 11月, 2005 2 次提交