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| author | Arnd Bergmann <arnd@arndb.de> | 2015-10-06 22:29:48 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-10-12 13:09:40 -0600 |
| commit | 835da3f99d329b1160a1f7fc82c7ac81163d63d0 (patch) | |
| tree | 8614dca9bfd9d2147c1d8af428b44ba6405fd80b /drivers/block/nvme-core.c | |
| parent | c5edf9cdc4c483b9a94c03fc0b9f769bd090bf3e (diff) | |
| download | lwn-835da3f99d329b1160a1f7fc82c7ac81163d63d0.tar.gz lwn-835da3f99d329b1160a1f7fc82c7ac81163d63d0.zip | |
nvme: fix 32-bit build warning
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.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: d29ec8241c10e ("nvme: submit internal commands through the block layer")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/nvme-core.c')
| -rw-r--r-- | drivers/block/nvme-core.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index 6f04771f1019..fce353ba5f66 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -1804,7 +1804,7 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) 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) { @@ -1844,7 +1844,7 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) 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) { @@ -1886,7 +1886,7 @@ static int nvme_user_cmd(struct nvme_dev *dev, struct nvme_ns *ns, 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)) |