diff options
| author | Toshi Kani <toshi.kani@hp.com> | 2015-06-04 18:55:14 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-06-07 15:28:55 +0200 |
| commit | ecb2febaaa3945e1578359adc30ca818e78540fb (patch) | |
| tree | f1b054c418316f4ba65c36eeded90efbfcea0aad /Documentation/x86 | |
| parent | x86/mm/pat: Change reserve_memtype() for Write-Through type (diff) | |
| download | linux-ecb2febaaa3945e1578359adc30ca818e78540fb.tar.xz linux-ecb2febaaa3945e1578359adc30ca818e78540fb.zip | |
x86/mm: Teach is_new_memtype_allowed() about Write-Through type
__ioremap_caller() calls reserve_memtype() and the passed down
@new_pcm contains the actual page cache type it reserved in the
success case.
is_new_memtype_allowed() verifies if converting to the new page
cache type is allowed when @pcm (the requested type) is
different from @new_pcm.
When WT is requested, the caller expects that writes are ordered
and uncached. Therefore, enhance is_new_memtype_allowed() to
disallow the following cases:
- If the request is WT, mapping type cannot be WB
- If the request is WT, mapping type cannot be WC
Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Elliott@hp.com
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: arnd@arndb.de
Cc: hch@lst.de
Cc: hmh@hmh.eng.br
Cc: jgross@suse.com
Cc: konrad.wilk@oracle.com
Cc: linux-mm <linux-mm@kvack.org>
Cc: linux-nvdimm@lists.01.org
Cc: stefan.bader@canonical.com
Cc: yigal@plexistor.com
Link: http://lkml.kernel.org/r/1433436928-31903-7-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/x86')
0 files changed, 0 insertions, 0 deletions