On 02/17/2015 10:52 PM, Ross Zwisler wrote: > On Mon, 2015-02-16 at 13:24 +0200, Boaz Harrosh wrote: >> With old Kernels there was a bug in x86 where any unknown >> memory chip type would come up BUSY when calling >> request_mem_region_exclusive(). >> >> So for pmem to work with old Kernels and real NvDIMM chips >> we have a new Kconfig option CONFIG_BLK_DEV_PMEM_IGNORE_REQUEST_MEM_RET. >> >> People have been running with hacked up pmem that will ignore >> the return code from request_mem_region_exclusive. So here it is >> official >> >> Signed-off-by: Boaz Harrosh <[email protected]> >
Hi Ross, good morning > I'm confused - I thought that this behavior was fixed by patch 1/3? > With that patch this memory reservation should not fail, correct? > Yes, I have tested it extensively and PATCH-1/3 fixes this problem for sure. > If so, why do we need this patch? > I put in this patch for people that do-not-want/cannot compile their own Kernel but have a need for pmem.c regardless. I will not include this patch in the final submitted Kernel. Given that patch-1 gets accepted before the merge of pmem. Lets say that patch-1 and patch-3 are either or. A tree that has 1/3 does not need 3/3, a tree that does not have 1/3 needs 3/3. <> Thanks Boaz -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
