# \[PATCH\] powerpc: add pgprot\_cached\_noncoherent()

- From: Geoff Thorpe \<hidden\>
- Date: 2011-10-27 13:05:40 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2011/10/9466731
- Thread: https://ratatoskr.run/linuxppc-dev/2011/10/9466731/t.md

```text
This adds a pgprot combination required by some cache-enabled IO device
mappings, such as Freescale datapath (QMan and BMan) portals.

Signed-off-by: Geoff Thorpe <redacted>
---
 arch/powerpc/include/asm/pgtable.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 88b0bd9..2e0e411 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -170,6 +170,9 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long addre
 #define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
 				            _PAGE_COHERENT | _PAGE_WRITETHRU))
 
+#define pgprot_cached_noncoherent(prot) \
+		(__pgprot(pgprot_val(prot) & ~_PAGE_CACHE_CTL))
+
 #define pgprot_writecombine pgprot_noncached_wc
 
 struct file;
-- 
1.7.3.4
```