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Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

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* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/mm: Lockless get_user_pages_fast() for 64-bit (v3)
  powerpc: Don't use the wrong thread_struct for ptrace get/set VSX regs
  powerpc: Fix ptrace buffer size for VSX
  powerpc: Correctly hookup PTRACE_GET/SETVSRREGS for 32 bit processes
  ide/powermac: Fix use of uninitialized pointer on media-bay
  powerpc: Allow non-hcall return values for lparcfg writes
  ipmi/powerpc: Use linux/of_{device,platform}.h instead of asm
  powerpc/fsl: proliferate simple-bus compatibility to soc nodes
  Documentation: remove old sbc8260 board specific information
  cpm2: Rework baud rate generators configuration to support external clocks.
  powerpc: rtc_cmos_setup: assign interrupts only if there is i8259 PIC
  cpm_uart: Add generic clock API support to set baudrates
  cpm_uart: Modem control lines support
  powerpc: implement GPIO LIB API on CPM1 Freescale SoC.
  cpm2: Implement GPIO LIB API on CPM2 Freescale SoC.
  powerpc: Fix 8xx build failure
  powerpc: clean up the Book-E HW watchpoint support
This commit is contained in:
Linus Torvalds 2008-07-30 10:43:56 -07:00
commit 660fc1f4d8
54 changed files with 907 additions and 290 deletions
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23
include/linux/pagemap.h
View file

@ -143,6 +143,29 @@ static inline int page_cache_get_speculative(struct page *page)
return 1;
}
/*
* Same as above, but add instead of inc (could just be merged)
*/
static inline int page_cache_add_speculative(struct page *page, int count)
{
VM_BUG_ON(in_interrupt());
#if !defined(CONFIG_SMP) && defined(CONFIG_CLASSIC_RCU)
# ifdef CONFIG_PREEMPT
VM_BUG_ON(!in_atomic());
# endif
VM_BUG_ON(page_count(page) == 0);
atomic_add(count, &page->_count);
#else
if (unlikely(!atomic_add_unless(&page->_count, count, 0)))
return 0;
#endif
VM_BUG_ON(PageCompound(page) && page != compound_head(page));
return 1;
}
static inline int page_freeze_refs(struct page *page, int count)
{
return likely(atomic_cmpxchg(&page->_count, count, 0) == count);