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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2013-07-28 11:21:53 +0900 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2013-08-05 21:05:21 +0100 |
| commit | 08efe91a1befa67bcc3799e0d29b7194803e1538 (patch) | |
| tree | 7e6ca93afeb8b14475461ebd1d9795258b51042e /drivers/mtd/nand | |
| parent | 60c6738245612df9499b340c15edf48b8f3e7981 (diff) | |
| download | op-kernel-dev-08efe91a1befa67bcc3799e0d29b7194803e1538.zip op-kernel-dev-08efe91a1befa67bcc3799e0d29b7194803e1538.tar.gz | |
mtd: nandsim: convert pages_written[] to bitmap
nandsim.pages_written[] is the array of unsigned char which is indexed
by the page number and used for identifying which pages have been written
when cache_file is used. Each entry holds 0 (not written) or 1 (written),
so it can be converted to bitmap. This reduces the allocation size of
pages_written[] by 1/8.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/nand')
| -rw-r--r-- | drivers/mtd/nand/nandsim.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c index cb38f3d..a73dce0 100644 --- a/drivers/mtd/nand/nandsim.c +++ b/drivers/mtd/nand/nandsim.c @@ -363,7 +363,7 @@ struct nandsim { /* Fields needed when using a cache file */ struct file *cfile; /* Open file */ - unsigned char *pages_written; /* Which pages have been written */ + unsigned long *pages_written; /* Which pages have been written */ void *file_buf; struct page *held_pages[NS_MAX_HELD_PAGES]; int held_cnt; @@ -586,7 +586,8 @@ static int alloc_device(struct nandsim *ns) err = -EINVAL; goto err_close; } - ns->pages_written = vzalloc(ns->geom.pgnum); + ns->pages_written = vzalloc(BITS_TO_LONGS(ns->geom.pgnum) * + sizeof(unsigned long)); if (!ns->pages_written) { NS_ERR("alloc_device: unable to allocate pages written array\n"); err = -ENOMEM; @@ -1479,7 +1480,7 @@ static void read_page(struct nandsim *ns, int num) union ns_mem *mypage; if (ns->cfile) { - if (!ns->pages_written[ns->regs.row]) { + if (!test_bit(ns->regs.row, ns->pages_written)) { NS_DBG("read_page: page %d not written\n", ns->regs.row); memset(ns->buf.byte, 0xFF, num); } else { @@ -1525,9 +1526,9 @@ static void erase_sector(struct nandsim *ns) if (ns->cfile) { for (i = 0; i < ns->geom.pgsec; i++) - if (ns->pages_written[ns->regs.row + i]) { + if (__test_and_clear_bit(ns->regs.row + i, + ns->pages_written)) { NS_DBG("erase_sector: freeing page %d\n", ns->regs.row + i); - ns->pages_written[ns->regs.row + i] = 0; } return; } @@ -1560,7 +1561,7 @@ static int prog_page(struct nandsim *ns, int num) NS_DBG("prog_page: writing page %d\n", ns->regs.row); pg_off = ns->file_buf + ns->regs.column + ns->regs.off; off = (loff_t)ns->regs.row * ns->geom.pgszoob + ns->regs.column + ns->regs.off; - if (!ns->pages_written[ns->regs.row]) { + if (!test_bit(ns->regs.row, ns->pages_written)) { all = 1; memset(ns->file_buf, 0xff, ns->geom.pgszoob); } else { @@ -1580,7 +1581,7 @@ static int prog_page(struct nandsim *ns, int num) NS_ERR("prog_page: write error for page %d ret %ld\n", ns->regs.row, (long)tx); return -1; } - ns->pages_written[ns->regs.row] = 1; + __set_bit(ns->regs.row, ns->pages_written); } else { tx = write_file(ns, ns->cfile, pg_off, num, off); if (tx != num) { |
