Patch "nvme: fix 32-bit build warning" has been added to the 4.2-stable tree

This is a note to let you know that I've just added the patch titled

nvme: fix 32-bit build warning

to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
nvme-fix-32-bit-build-warning.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Arnd Bergmann <[email protected]>
Date: Tue, 6 Oct 2015 22:29:48 +0200
Subject: nvme: fix 32-bit build warning

From: Arnd Bergmann <[email protected]>

commit 835da3f99d329b1160a1f7fc82c7ac81163d63d0 upstream.

Compiling the nvme driver on 32-bit warns about a cast from a __u64 variable to a pointer:

drivers/block/nvme-core.c: In function 'nvme_submit_io':
drivers/block/nvme-core.c:1847:4: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

    (void __user *)io.addr, length, NULL, 0);

The cast here is intentional and safe, so we can shut up the gcc warning by adding an intermediate cast to 'uintptr_t'.

I had previously submitted a patch to fix this problem in the nvme driver, but it was accepted on the same day that two new warnings got added.

For clarification, I also change the third instance of this cast to use uintptr_t instead of unsigned long now.

---
 drivers/block/nvme-core.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

@@ -1764,7 +1764,7 @@ static int nvme_submit_io(struct nvme_ns
 
 	length = (io.nblocks + 1) << ns->lba_shift;
 	meta_len = (io.nblocks + 1) * ns->ms;
-	metadata = (void __user *)(unsigned long)io.metadata;
+	metadata = (void __user *)(uintptr_t)io.metadata;
 	write = io.opcode & 1;
 
 	if (ns->ext) {

@@ -1804,7 +1804,7 @@ static int nvme_submit_io(struct nvme_ns
 	c.rw.metadata = cpu_to_le64(meta_dma);
 
 	status = __nvme_submit_sync_cmd(ns->queue, &c, NULL,
-			(void __user *)io.addr, length, NULL, 0);
+			(void __user *)(uintptr_t)io.addr, length, NULL, 0);
  unmap:
 	if (meta) {
 		if (status == NVME_SC_SUCCESS && !write) {

@@ -1846,7 +1846,7 @@ static int nvme_user_cmd(struct nvme_dev
 		timeout = msecs_to_jiffies(cmd.timeout_ms);
 
 	status = __nvme_submit_sync_cmd(ns ? ns->queue : dev->admin_q, &c,
-			NULL, (void __user *)cmd.addr, cmd.data_len,
+			NULL, (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
 			&cmd.result, timeout);
 	if (status >= 0) {
 		if (put_user(cmd.result, &ucmd->result))

Patches currently in stable-queue which might be from [email protected] are

queue-4.2/kvm-arm-use-gic-support-unconditionally.patch queue-4.2/nvme-fix-32-bit-build-warning.patch queue-4.2/arm-ux500-modify-initial-levelshifter-status.patch queue-4.2/bus-arm-ccn-fix-irq-affinity-setting-on-cpu-migration.patch