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  1. 13 5月, 2008 1 次提交
  3. 08 5月, 2008 1 次提交
    • T
      x86: cleanup PAT cpu validation · 8d4a4300
      由 Thomas Gleixner 提交于 
      Move the scattered checks for PAT support to a single function. Its
moved to addon_cpuid_features.c as this file is shared between 32 and
64 bit.

Remove the manipulation of the PAT feature bit and just disable PAT in
the PAT layer, based on the PAT bit provided by the CPU and the
current CPU version/model white list.

Change the boot CPU check so it works on Voyager somewhere in the
future as well :) Also panic, when a secondary has PAT disabled but
the primary one has alrady switched to PAT. We have no way to undo
that.

The white list is kept for now to ensure that we can rely on known to
work CPU types and concentrate on the software induced problems
instead of fighthing CPU erratas and subtle wreckage caused by not yet
verified CPUs. Once the PAT code has stabilized enough, we can remove
the white list and open the can of worms.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      8d4a4300
  5. 28 4月, 2008 2 次提交
    • I
      x86: PAT fix · f022bfd5
      由 Ingo Molnar 提交于 
      Adrian Bunk noticed the following Coverity report:

> Commit e7f260a2
> (x86: PAT use reserve free memtype in mmap of /dev/mem)
> added the following gem to arch/x86/mm/pat.c:
>
> <--  snip  -->
>
> ...
> int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
>                                 unsigned long size, pgprot_t *vma_prot)
> {
>         u64 offset = ((u64) pfn) << PAGE_SHIFT;
>         unsigned long flags = _PAGE_CACHE_UC_MINUS;
>         unsigned long ret_flags;
> ...
> ...  (nothing that touches ret_flags)
> ...
>         if (flags != _PAGE_CACHE_UC_MINUS) {
>                 retval = reserve_memtype(offset, offset + size, flags, NULL);
>         } else {
>                 retval = reserve_memtype(offset, offset + size, -1, &ret_flags);
>         }
>
>         if (retval < 0)
>                 return 0;
>
>         flags = ret_flags;
>
>         if (pfn <= max_pfn_mapped &&
>             ioremap_change_attr((unsigned long)__va(offset), size, flags) < 0) {
>                 free_memtype(offset, offset + size);
>                 printk(KERN_INFO
>                 "%s:%d /dev/mem ioremap_change_attr failed %s for %Lx-%Lx\n",
>                         current->comm, current->pid,
>                         cattr_name(flags),
>                         offset, offset + size);
>                 return 0;
>         }
>
>         *vma_prot = __pgprot((pgprot_val(*vma_prot) & ~_PAGE_CACHE_MASK) |
>                              flags);
>         return 1;
> }
>
> <--  snip  -->
>
> If (flags != _PAGE_CACHE_UC_MINUS) we pass garbage from the stack to
> ioremap_change_attr() and/or __pgprot().
>
> Spotted by the Coverity checker.

the fix simplifies the code as we get rid of the 'ret_flags'
complication.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      f022bfd5
    • L
      x86 PAT: tone down debugging messages some more · 86cf02f8
      由 Linus Torvalds 提交于 
      Ingo already fixed one of these at my request (in "x86 PAT: tone down
debugging messages", commit 1ebcc654),
but there was another one he missed.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      86cf02f8
  7. 27 4月, 2008 1 次提交
  9. 26 4月, 2008 1 次提交
    • I
      x86 PAT: tone down debugging messages · 1ebcc654
      由 Ingo Molnar 提交于 
      Linus reported these excessive debug printouts:

>       Overlap at 0xe0300000-0xe0400000
>       Overlap at 0xe0300000-0xe0380000
>       Overlap at 0xe0300000-0xe0400000
>       Overlap at 0xe0300000-0xe0400000
>       Overlap at 0xe0300000-0xe0400000
>       Overlap at 0xe0300000-0xe0400000
>       Overlap at 0xe0300000-0xe0400000

turn that into a pr_debug().
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      1ebcc654
  11. 25 4月, 2008 3 次提交
  13. 17 4月, 2008 4 次提交