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  1. 01 4月, 2009 1 次提交
  3. 25 3月, 2009 1 次提交
  5. 22 3月, 2009 1 次提交
  7. 20 3月, 2009 3 次提交
  9. 19 3月, 2009 1 次提交
  11. 18 3月, 2009 1 次提交
    • S
      x86: add x2apic_wrmsr_fence() to x2apic flush tlb paths · ce4e240c
      由 Suresh Siddha 提交于 
      Impact: optimize APIC IPI related barriers

Uncached MMIO accesses for xapic are inherently serializing and hence
we don't need explicit barriers for xapic IPI paths.

x2apic MSR writes/reads don't have serializing semantics and hence need
a serializing instruction or mfence, to make all the previous memory
stores globally visisble before the x2apic msr write for IPI.

Add x2apic_wrmsr_fence() in flush tlb path to x2apic specific paths.
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: "steiner@sgi.com" <steiner@sgi.com>
Cc: Nick Piggin <npiggin@suse.de>
LKML-Reference: <1237313814.27006.203.camel@localhost.localdomain>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      ce4e240c
  13. 16 3月, 2009 1 次提交
  15. 15 3月, 2009 1 次提交
    • J
      x86: add brk allocation for very, very early allocations · 93dbda7c
      由 Jeremy Fitzhardinge 提交于 
      Impact: new interface

Add a brk()-like allocator which effectively extends the bss in order
to allow very early code to do dynamic allocations.  This is better than
using statically allocated arrays for data in subsystems which may never
get used.

The space for brk allocations is in the bss ELF segment, so that the
space is mapped properly by the code which maps the kernel, and so
that bootloaders keep the space free rather than putting a ramdisk or
something into it.

The bss itself, delimited by __bss_stop, ends before the brk area
(__brk_base to __brk_limit).  The kernel text, data and bss is reserved
up to __bss_stop.

Any brk-allocated data is reserved separately just before the kernel
pagetable is built, as that code allocates from unreserved spaces
in the e820 map, potentially allocating from any unused brk memory.
Ultimately any unused memory in the brk area is used in the general
kernel memory pool.

Initially the brk space is set to 1MB, which is probably much larger
than any user needs (the largest current user is i386 head_32.S's code
to build the pagetables to map the kernel, which can get fairly large
with a big kernel image and no PSE support).  So long as the system
has sufficient memory for the bootloader to reserve the kernel+1MB brk,
there are no bad effects resulting from an over-large brk.
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      93dbda7c
  17. 13 3月, 2009 5 次提交
  19. 12 3月, 2009 2 次提交
  21. 11 3月, 2009 2 次提交
  23. 09 3月, 2009 4 次提交
    • J
      x86-32: make sure virt_addr_valid() returns false for fixmap addresses · 0feca851
      由 Jeremy Fitzhardinge 提交于 
      I found that virt_addr_valid() was returning true for fixmap addresses.

I'm not sure whether pfn_valid() is supposed to include this test,
but there's no harm in being explicit.
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <49B166D6.2080505@goop.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      0feca851
    • S
      x86 mmiotrace: fix remove_kmmio_fault_pages() · d0fc63f7
      由 Stuart Bennett 提交于 
      Impact: fix race+crash in mmiotrace

The list manipulation in remove_kmmio_fault_pages() was broken. If more
than one consecutive kmmio_fault_page was re-added during the grace
period between unregister_kmmio_probe() and remove_kmmio_fault_pages(),
the list manipulation failed to remove pages from the release list.

After a second grace period the pages get into rcu_free_kmmio_fault_pages()
and raise a BUG_ON() kernel crash.

The list manipulation is fixed to properly remove pages from the release
list.

This bug has been present from the very beginning of mmiotrace in the
mainline kernel. It was introduced in 0fd0e3da ("x86: mmiotrace full
patch, preview 1");

An urgent fix for Linus. Tested by Stuart (on 32-bit) and Pekka
(on amd and intel 64-bit systems, nouveau and nvidia proprietary).
Signed-off-by: NStuart Bennett <stuart@freedesktop.org>
Signed-off-by: NPekka Paalanen <pq@iki.fi>
LKML-Reference: <20090308202135.34933feb@daedalus.pq.iki.fi>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      d0fc63f7
    • Y
      x86: fix warning about nodeid · e954ef20
      由 Yinghai Lu 提交于 
      Impact: cleanup

Ingo found there warning about nodeid with some configs.

try to use for_each_online_node for non numa too. in that case
nodeid will be 0.

also move out boundary checking from setup_node_bootmem(), so
non-numa config will not check it.
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <49B03069.80001@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      e954ef20
    • W
      x86: don't define __this_fixmap_does_not_exist() · 8827247f
      由 Wang Chen 提交于 
      Impact: improve out-of-range fixmap index debugging

Commit "1b42f516"
defined the __this_fixmap_does_not_exist() function
with a WARN_ON(1) in it.

This causes the linker to not report an error when
__this_fixmap_does_not_exist() is called with a
non-constant parameter.

Ingo defined __this_fixmap_does_not_exist() because he
wanted to get virt addresses of fix memory of nest level
by non-constant index.

But we can fix this and still keep the link-time check:

We can get the four slot virt addresses on link time and
store them to array slot_virt[].

Then we can then refer the slot_virt with non-constant index,
in the ioremap-leak detection code.
Signed-off-by: NWang Chen <wangchen@cn.fujitsu.com>
LKML-Reference: <49B2075B.4070509@cn.fujitsu.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      8827247f
  25. 06 3月, 2009 3 次提交
  27. 05 3月, 2009 14 次提交