On 10/17/2014 07:09 AM, Dominik Dingel wrote: > diff --git a/include/linux/mm.h b/include/linux/mm.h > index cd33ae2..8f09c91 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -113,7 +113,7 @@ extern unsigned int kobjsize(const void *objp); > #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ > #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct > page", just pure PFN */ > #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ > - > +#define VM_NOZEROPAGE 0x00001000 /* forbid new zero page > mappings */ > #define VM_LOCKED 0x00002000 > #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
This seems like an awfully obscure use for a very constrained resource (VM_ flags). Is there ever a time where the VMAs under an mm have mixed VM_NOZEROPAGE status? Reading the patches, it _looks_ like it might be an all or nothing thing. Full disclosure: I've got an x86-specific feature I want to steal a flag for. Maybe we should just define another VM_ARCH bit. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
