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Date: Sun, 27 Nov 2011 21:36:34 -0500
From: Benjamin LaHaise <bcrl@...ck.org>
To: Cong Wang <amwang@...hat.com>
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
Alexander Viro <viro@...iv.linux.org.uk>,
Jens Axboe <axboe@...nel.dk>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Tao Ma <boyu.mt@...bao.com>, linux-aio@...ck.org,
linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 29/62] fs: remove the second argument of k[un]map_atomic()
On Sun, Nov 27, 2011 at 01:27:09PM +0800, Cong Wang wrote:
>
> Signed-off-by: Cong Wang <amwang@...hat.com>
Acked-by: Benjamin LaHaise <bcrl@...ck.org>
-ben
> ---
> fs/aio.c | 30 +++++++++++++++---------------
> fs/bio-integrity.c | 10 +++++-----
> fs/exec.c | 4 ++--
> fs/namei.c | 4 ++--
> fs/pipe.c | 8 ++++----
> fs/splice.c | 7 ++-----
> include/linux/bio.h | 8 ++++----
> 7 files changed, 34 insertions(+), 37 deletions(-)
>
> diff --git a/fs/aio.c b/fs/aio.c
> index 78c514c..34e0d9f 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -160,7 +160,7 @@ static int aio_setup_ring(struct kioctx *ctx)
>
> info->nr = nr_events; /* trusted copy */
>
> - ring = kmap_atomic(info->ring_pages[0], KM_USER0);
> + ring = kmap_atomic(info->ring_pages[0]);
> ring->nr = nr_events; /* user copy */
> ring->id = ctx->user_id;
> ring->head = ring->tail = 0;
> @@ -168,32 +168,32 @@ static int aio_setup_ring(struct kioctx *ctx)
> ring->compat_features = AIO_RING_COMPAT_FEATURES;
> ring->incompat_features = AIO_RING_INCOMPAT_FEATURES;
> ring->header_length = sizeof(struct aio_ring);
> - kunmap_atomic(ring, KM_USER0);
> + kunmap_atomic(ring);
>
> return 0;
> }
>
>
> /* aio_ring_event: returns a pointer to the event at the given index from
> - * kmap_atomic(, km). Release the pointer with put_aio_ring_event();
> + * kmap_atomic(). Release the pointer with put_aio_ring_event();
> */
> #define AIO_EVENTS_PER_PAGE (PAGE_SIZE / sizeof(struct io_event))
> #define AIO_EVENTS_FIRST_PAGE ((PAGE_SIZE - sizeof(struct aio_ring)) / sizeof(struct io_event))
> #define AIO_EVENTS_OFFSET (AIO_EVENTS_PER_PAGE - AIO_EVENTS_FIRST_PAGE)
>
> -#define aio_ring_event(info, nr, km) ({ \
> +#define aio_ring_event(info, nr) ({ \
> unsigned pos = (nr) + AIO_EVENTS_OFFSET; \
> struct io_event *__event; \
> __event = kmap_atomic( \
> - (info)->ring_pages[pos / AIO_EVENTS_PER_PAGE], km); \
> + (info)->ring_pages[pos / AIO_EVENTS_PER_PAGE]); \
> __event += pos % AIO_EVENTS_PER_PAGE; \
> __event; \
> })
>
> -#define put_aio_ring_event(event, km) do { \
> +#define put_aio_ring_event(event) do { \
> struct io_event *__event = (event); \
> (void)__event; \
> - kunmap_atomic((void *)((unsigned long)__event & PAGE_MASK), km); \
> + kunmap_atomic((void *)((unsigned long)__event & PAGE_MASK)); \
> } while(0)
>
> static void ctx_rcu_free(struct rcu_head *head)
> @@ -1012,10 +1012,10 @@ int aio_complete(struct kiocb *iocb, long res, long res2)
> if (kiocbIsCancelled(iocb))
> goto put_rq;
>
> - ring = kmap_atomic(info->ring_pages[0], KM_IRQ1);
> + ring = kmap_atomic(info->ring_pages[0]);
>
> tail = info->tail;
> - event = aio_ring_event(info, tail, KM_IRQ0);
> + event = aio_ring_event(info, tail);
> if (++tail >= info->nr)
> tail = 0;
>
> @@ -1036,8 +1036,8 @@ int aio_complete(struct kiocb *iocb, long res, long res2)
> info->tail = tail;
> ring->tail = tail;
>
> - put_aio_ring_event(event, KM_IRQ0);
> - kunmap_atomic(ring, KM_IRQ1);
> + put_aio_ring_event(event);
> + kunmap_atomic(ring);
>
> pr_debug("added to ring %p at [%lu]\n", iocb, tail);
>
> @@ -1082,7 +1082,7 @@ static int aio_read_evt(struct kioctx *ioctx, struct io_event *ent)
> unsigned long head;
> int ret = 0;
>
> - ring = kmap_atomic(info->ring_pages[0], KM_USER0);
> + ring = kmap_atomic(info->ring_pages[0]);
> dprintk("in aio_read_evt h%lu t%lu m%lu\n",
> (unsigned long)ring->head, (unsigned long)ring->tail,
> (unsigned long)ring->nr);
> @@ -1094,18 +1094,18 @@ static int aio_read_evt(struct kioctx *ioctx, struct io_event *ent)
>
> head = ring->head % info->nr;
> if (head != ring->tail) {
> - struct io_event *evp = aio_ring_event(info, head, KM_USER1);
> + struct io_event *evp = aio_ring_event(info, head);
> *ent = *evp;
> head = (head + 1) % info->nr;
> smp_mb(); /* finish reading the event before updatng the head */
> ring->head = head;
> ret = 1;
> - put_aio_ring_event(evp, KM_USER1);
> + put_aio_ring_event(evp);
> }
> spin_unlock(&info->ring_lock);
>
> out:
> - kunmap_atomic(ring, KM_USER0);
> + kunmap_atomic(ring);
> dprintk("leaving aio_read_evt: %d h%lu t%lu\n", ret,
> (unsigned long)ring->head, (unsigned long)ring->tail);
> return ret;
> diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
> index c2183f3..e85c04b 100644
> --- a/fs/bio-integrity.c
> +++ b/fs/bio-integrity.c
> @@ -357,7 +357,7 @@ static void bio_integrity_generate(struct bio *bio)
> bix.sector_size = bi->sector_size;
>
> bio_for_each_segment(bv, bio, i) {
> - void *kaddr = kmap_atomic(bv->bv_page, KM_USER0);
> + void *kaddr = kmap_atomic(bv->bv_page);
> bix.data_buf = kaddr + bv->bv_offset;
> bix.data_size = bv->bv_len;
> bix.prot_buf = prot_buf;
> @@ -371,7 +371,7 @@ static void bio_integrity_generate(struct bio *bio)
> total += sectors * bi->tuple_size;
> BUG_ON(total > bio->bi_integrity->bip_size);
>
> - kunmap_atomic(kaddr, KM_USER0);
> + kunmap_atomic(kaddr);
> }
> }
>
> @@ -498,7 +498,7 @@ static int bio_integrity_verify(struct bio *bio)
> bix.sector_size = bi->sector_size;
>
> bio_for_each_segment(bv, bio, i) {
> - void *kaddr = kmap_atomic(bv->bv_page, KM_USER0);
> + void *kaddr = kmap_atomic(bv->bv_page);
> bix.data_buf = kaddr + bv->bv_offset;
> bix.data_size = bv->bv_len;
> bix.prot_buf = prot_buf;
> @@ -507,7 +507,7 @@ static int bio_integrity_verify(struct bio *bio)
> ret = bi->verify_fn(&bix);
>
> if (ret) {
> - kunmap_atomic(kaddr, KM_USER0);
> + kunmap_atomic(kaddr);
> return ret;
> }
>
> @@ -517,7 +517,7 @@ static int bio_integrity_verify(struct bio *bio)
> total += sectors * bi->tuple_size;
> BUG_ON(total > bio->bi_integrity->bip_size);
>
> - kunmap_atomic(kaddr, KM_USER0);
> + kunmap_atomic(kaddr);
> }
>
> return ret;
> diff --git a/fs/exec.c b/fs/exec.c
> index 3625464..ca141db 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -1334,13 +1334,13 @@ int remove_arg_zero(struct linux_binprm *bprm)
> ret = -EFAULT;
> goto out;
> }
> - kaddr = kmap_atomic(page, KM_USER0);
> + kaddr = kmap_atomic(page);
>
> for (; offset < PAGE_SIZE && kaddr[offset];
> offset++, bprm->p++)
> ;
>
> - kunmap_atomic(kaddr, KM_USER0);
> + kunmap_atomic(kaddr);
> put_arg_page(page);
>
> if (offset == PAGE_SIZE)
> diff --git a/fs/namei.c b/fs/namei.c
> index 5008f01..c02b2c6 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -3346,9 +3346,9 @@ retry:
> if (err)
> goto fail;
>
> - kaddr = kmap_atomic(page, KM_USER0);
> + kaddr = kmap_atomic(page);
> memcpy(kaddr, symname, len-1);
> - kunmap_atomic(kaddr, KM_USER0);
> + kunmap_atomic(kaddr);
>
> err = pagecache_write_end(NULL, mapping, 0, len-1, len-1,
> page, fsdata);
> diff --git a/fs/pipe.c b/fs/pipe.c
> index 4065f07..2c59dfa 100644
> --- a/fs/pipe.c
> +++ b/fs/pipe.c
> @@ -230,7 +230,7 @@ void *generic_pipe_buf_map(struct pipe_inode_info *pipe,
> {
> if (atomic) {
> buf->flags |= PIPE_BUF_FLAG_ATOMIC;
> - return kmap_atomic(buf->page, KM_USER0);
> + return kmap_atomic(buf->page);
> }
>
> return kmap(buf->page);
> @@ -251,7 +251,7 @@ void generic_pipe_buf_unmap(struct pipe_inode_info *pipe,
> {
> if (buf->flags & PIPE_BUF_FLAG_ATOMIC) {
> buf->flags &= ~PIPE_BUF_FLAG_ATOMIC;
> - kunmap_atomic(map_data, KM_USER0);
> + kunmap_atomic(map_data);
> } else
> kunmap(buf->page);
> }
> @@ -565,14 +565,14 @@ redo1:
> iov_fault_in_pages_read(iov, chars);
> redo2:
> if (atomic)
> - src = kmap_atomic(page, KM_USER0);
> + src = kmap_atomic(page);
> else
> src = kmap(page);
>
> error = pipe_iov_copy_from_user(src, iov, chars,
> atomic);
> if (atomic)
> - kunmap_atomic(src, KM_USER0);
> + kunmap_atomic(src);
> else
> kunmap(page);
>
> diff --git a/fs/splice.c b/fs/splice.c
> index fa2defa..da01377 100644
> --- a/fs/splice.c
> +++ b/fs/splice.c
> @@ -738,15 +738,12 @@ int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
> goto out;
>
> if (buf->page != page) {
> - /*
> - * Careful, ->map() uses KM_USER0!
> - */
> char *src = buf->ops->map(pipe, buf, 1);
> - char *dst = kmap_atomic(page, KM_USER1);
> + char *dst = kmap_atomic(page);
>
> memcpy(dst + offset, src + buf->offset, this_len);
> flush_dcache_page(page);
> - kunmap_atomic(dst, KM_USER1);
> + kunmap_atomic(dst);
> buf->ops->unmap(pipe, buf, src);
> }
> ret = pagecache_write_end(file, mapping, sd->pos, this_len, this_len,
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 847994a..6ed3ba4 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -101,10 +101,10 @@ static inline int bio_has_allocated_vec(struct bio *bio)
> * I/O completely on that queue (see ide-dma for example)
> */
> #define __bio_kmap_atomic(bio, idx, kmtype) \
> - (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \
> + (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page) + \
> bio_iovec_idx((bio), (idx))->bv_offset)
>
> -#define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
> +#define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr)
>
> /*
> * merge helpers etc
> @@ -317,7 +317,7 @@ static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
> * balancing is a lot nicer this way
> */
> local_irq_save(*flags);
> - addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
> + addr = (unsigned long) kmap_atomic(bvec->bv_page);
>
> BUG_ON(addr & ~PAGE_MASK);
>
> @@ -328,7 +328,7 @@ static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
> {
> unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
>
> - kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
> + kunmap_atomic((void *) ptr);
> local_irq_restore(*flags);
> }
>
> --
> 1.7.4.4
--
"Thought is the essence of where you are now."
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