On Wed, 2015-03-25 at 17:04 +0100, Christoph Hellwig wrote: > Various recent bioses support NVDIMMs or ADR using a non-standard > e820 memory type, and Intel supplied reference Linux code using this > type to various vendors. > > Wire this e820 table type up to export platform devices for the pmem > driver so that we can use it in Linux, and also provide a memmap= > argument to manually tag memory as protected, which can be used > if the bios doesn't use the standard nonstandard interface, or > we just want to test the pmem driver with regular memory. > > Based on an earlier patch from Dave Jiang <dave.jiang@xxxxxxxxx> > Signed-off-by: Christoph Hellwig <hch@xxxxxx> <snip> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index b7d31ca..93a27e4 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -1430,6 +1430,19 @@ config ILLEGAL_POINTER_VALUE > > source "mm/Kconfig" > > +config X86_PMEM_LEGACY > + bool "Support non-stanard NVDIMMs and ADR protected memory" > + help > + Treat memory marked using the non-stard e820 type of 12 as used > + by the Intel Sandy Bridge-EP reference BIOS as protected memory. > + The kernel will the offer these regions to the pmem driver so > + they can be used for persistent storage. > + > + If you say N the kernel will treat the ADR region like an e820 > + reserved region. > + > + Say Y if unsure Would it make sense to have this default to "y", or is that too strong? -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
