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  1. 26 2月, 2010 2 次提交
    • L
      x86-32: Allow UP/SMP lock replacement in cmpxchg64 · 9c76b384
      由 Luca Barbieri 提交于 
      Use the functionality just introduced in the previous patch: mark the
lock prefixes in cmpxchg64 alternatives for UP removal.

Changes in v2:
- Naming change
Signed-off-by: NLuca Barbieri <luca@luca-barbieri.com>
LKML-Reference: <1267005265-27958-3-git-send-email-luca@luca-barbieri.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      9c76b384
    • L
      x86: Add support for lock prefix in alternatives · b3ac891b
      由 Luca Barbieri 提交于 
      The current lock prefix UP/SMP alternative code doesn't allow
LOCK_PREFIX to be used in alternatives code.

This patch solves the problem by adding a new LOCK_PREFIX_ALTERNATIVE_PATCH
macro that only records the lock prefix location but does not emit
the prefix.

The user of this macro can then start any alternative sequence with
"lock" and have it UP/SMP patched.

To make this work, the UP/SMP alternative code is changed to do the
lock/DS prefix switching only if the byte actually contains a lock or
DS prefix.

Thus, if an alternative without the "lock" is selected, it will now do
nothing instead of clobbering the code.

Changes in v2:
- Naming change
- Change label to not conflict with alternatives
Signed-off-by: NLuca Barbieri <luca@luca-barbieri.com>
LKML-Reference: <1267005265-27958-2-git-send-email-luca@luca-barbieri.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      b3ac891b
  3. 17 2月, 2010 1 次提交
  5. 14 1月, 2010 1 次提交
  7. 13 1月, 2010 2 次提交
    • D
      x86: Macroise x86 cache descriptors · 2ca49b2f
      由 Dave Jones 提交于 
      Use a macro to define the cache sizes when cachesize > 1 MB.

This is less typing, and less prone to introducing bugs like we
saw in e02e0e1a, and means we
don't have to do maths when adding new non-power-of-2 updates
like those seen recently.
Signed-off-by: NDave Jones <davej@redhat.com>
LKML-Reference: <20100104144735.GA18390@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      2ca49b2f
    • L
      x86-32: clean up rwsem inline asm statements · 59c33fa7
      由 Linus Torvalds 提交于 
      This makes gcc use the right register names and instruction operand sizes
automatically for the rwsem inline asm statements.

So instead of using "(%%eax)" to specify the memory address that is the
semaphore, we use "(%1)" or similar. And instead of forcing the operation
to always be 32-bit, we use "%z0", taking the size from the actual
semaphore data structure itself.

This doesn't actually matter on x86-32, but if we want to use the same
inline asm for x86-64, we'll need to have the compiler generate the proper
64-bit names for the registers (%rax instead of %eax), and if we want to
use a 64-bit counter too (in order to avoid the 15-bit limit on the
write counter that limits concurrent users to 32767 threads), we'll need
to be able to generate instructions with "q" accesses rather than "l".

Since this header currently isn't enabled on x86-64, none of that matters,
but we do want to use the xadd version of the semaphores rather than have
to take spinlocks to do a rwsem. The mm->mmap_sem can be heavily contended
when you have lots of threads all taking page faults, and the fallback
rwsem code that uses a spinlock performs abysmally badly in that case.

[ hpa: modified the patch to skip size suffixes entirely when they are
  redundant due to register operands. ]
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <alpine.LFD.2.00.1001121613560.17145@localhost.localdomain>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      59c33fa7
  9. 08 1月, 2010 3 次提交
  11. 30 12月, 2009 3 次提交
    • J
      x86-64: Modify memcpy()/memset() alternatives mechanism · 7269e881
      由 Jan Beulich 提交于 
      In order to avoid unnecessary chains of branches, rather than
implementing memcpy()/memset()'s access to their alternative
implementations via a jump, patch the (larger) original function
directly.

The memcpy() part of this is slightly subtle: while alternative
instruction patching does itself use memcpy(), with the
replacement block being less than 64-bytes in size the main loop
of the original function doesn't get used for copying memcpy_c()
over memcpy(), and hence we can safely write over its beginning.

Also note that the CFI annotations are fine for both variants of
each of the functions.
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4B2BB8D30200007800026AF2@vpn.id2.novell.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      7269e881
    • J
      x86-64: Modify copy_user_generic() alternatives mechanism · 1b1d9258
      由 Jan Beulich 提交于 
      In order to avoid unnecessary chains of branches, rather than
implementing copy_user_generic() as a function consisting of
just a single (possibly patched) branch, instead properly deal
with patching call instructions in the alternative instructions
framework, and move the patching into the callers.

As a follow-on, one could also introduce something like
__EXPORT_SYMBOL_ALT() to avoid patching call sites in modules.
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4B2BB8180200007800026AE7@vpn.id2.novell.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      1b1d9258
    • J
      x86: Lift restriction on the location of FIX_BTMAP_* · 499a5f1e
      由 Jan Beulich 提交于 
      The early ioremap fixmap entries cover half (or for 32-bit
non-PAE, a quarter) of a page table, yet they got
uncondtitionally aligned so far to a 256-entry boundary. This is
not necessary if the range of page table entries anyway falls
into a single page table.

This buys back, for (theoretically) 50% of all configurations
(25% of all non-PAE ones), at least some of the lowmem
necessarily lost with commit e621bd18.
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4B2BB66F0200007800026AD6@vpn.id2.novell.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      499a5f1e
  13. 28 12月, 2009 1 次提交
    • A
      x86, core: Optimize hweight32() · 39d997b5
      由 Akinobu Mita 提交于 
      Optimize hweight32 by using the same technique in hweight64.

The proof of this technique can be found in the commit log for
f9b41929 ("bitops: hweight()
speedup").

The userspace benchmark on x86_32 showed 20% speedup with
bitmap_weight() which uses hweight32 to count bits for each
unsigned long on 32bit architectures.

 int main(void)
 {
	#define SZ (1024 * 1024 * 512)

	static DECLARE_BITMAP(bitmap, SZ) = {
	        [0 ... 100] = 1,
	};

	return bitmap_weight(bitmap, SZ);
 }
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1258603932-4590-1-git-send-email-akinobu.mita@gmail.com>
[ only x86 sets ARCH_HAS_FAST_MULTIPLIER so we do this via the x86 tree]
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      39d997b5
  15. 25 12月, 2009 10 次提交
  17. 24 12月, 2009 17 次提交