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| author | Ian Campbell <Ian.Campbell@citrix.com> | 2012-10-18 08:26:17 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-10-19 15:18:01 -0400 |
| commit | 3ab0b83bf6a1e834f4b884150d8012990c75d25d (patch) | |
| tree | 85dd17c47102cd854bd13896bab8532d1f0d0e08 /arch | |
| parent | 965c0aaafe3e75d4e65cd4ec862915869bde3abd (diff) | |
| download | linux-3.10-3ab0b83bf6a1e834f4b884150d8012990c75d25d.tar.gz linux-3.10-3ab0b83bf6a1e834f4b884150d8012990c75d25d.tar.bz2 linux-3.10-3ab0b83bf6a1e834f4b884150d8012990c75d25d.zip | |
xen: arm: comment on why 64-bit xen_pfn_t is safe even on 32 bit
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/xen/interface.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/include/asm/xen/interface.h b/arch/arm/include/asm/xen/interface.h index 1d6ef9c2d1d..5000397134b 100644 --- a/arch/arm/include/asm/xen/interface.h +++ b/arch/arm/include/asm/xen/interface.h @@ -29,7 +29,13 @@ #ifndef __ASSEMBLY__ /* Explicitly size integers that represent pfns in the interface with - * Xen so that we can have one ABI that works for 32 and 64 bit guests. */ + * Xen so that we can have one ABI that works for 32 and 64 bit guests. + * Note that this means that the xen_pfn_t type may be capable of + * representing pfn's which the guest cannot represent in its own pfn + * type. However since pfn space is controlled by the guest this is + * fine since it simply wouldn't be able to create any sure pfns in + * the first place. + */ typedef uint64_t xen_pfn_t; #define PRI_xen_pfn "llx" typedef uint64_t xen_ulong_t; |