Messages in this thread Patch in this message | | | From | Greg KH <> | Subject | [PATCH 39/49] Staging: poch: Correct pages from bytes. | Date | Wed, 29 Oct 2008 15:40:06 -0700 |
| |
From: vijaykumar@bravegnu.org <vijaykumar@bravegnu.org>
Accurately calculate the no. of pages from the bytes.
Signed-off-by: Vijay Kumar <vijaykumar@bravegnu.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/staging/poch/poch.c | 22 ++++++++++++++-------- 1 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/staging/poch/poch.c b/drivers/staging/poch/poch.c index de3f8c6..52fc3d4 100644 --- a/drivers/staging/poch/poch.c +++ b/drivers/staging/poch/poch.c @@ -299,6 +299,14 @@ static ssize_t show_direction(struct device *dev, } static DEVICE_ATTR(dir, S_IRUSR|S_IRGRP, show_direction, NULL); +static unsigned long npages(unsigned long bytes) +{ + if (bytes % PAGE_SIZE == 0) + return bytes / PAGE_SIZE; + else + return (bytes / PAGE_SIZE) + 1; +} + static ssize_t show_mmap_size(struct device *dev, struct device_attribute *attr, char *buf) { @@ -309,10 +317,8 @@ static ssize_t show_mmap_size(struct device *dev, unsigned long header_pages; unsigned long total_group_pages; - /* FIXME: We do not have to add 1, if group_size a multiple of - PAGE_SIZE. */ - group_pages = (channel->group_size / PAGE_SIZE) + 1; - header_pages = (channel->header_size / PAGE_SIZE) + 1; + group_pages = npages(channel->group_size); + header_pages = npages(channel->header_size); total_group_pages = group_pages * channel->group_count; mmap_size = (header_pages + total_group_pages) * PAGE_SIZE; @@ -350,8 +356,8 @@ static int poch_channel_alloc_groups(struct channel_info *channel) unsigned long group_pages; unsigned long header_pages; - group_pages = (channel->group_size / PAGE_SIZE) + 1; - header_pages = (channel->header_size / PAGE_SIZE) + 1; + group_pages = npages(channel->group_size); + header_pages = npages(channel->header_size); for (i = 0; i < channel->group_count; i++) { struct poch_group_info *group; @@ -850,8 +856,8 @@ static int poch_mmap(struct file *filp, struct vm_area_struct *vma) return -EINVAL; } - group_pages = (channel->group_size / PAGE_SIZE) + 1; - header_pages = (channel->header_size / PAGE_SIZE) + 1; + group_pages = npages(channel->group_size); + header_pages = npages(channel->header_size); total_group_pages = group_pages * channel->group_count; size = vma->vm_end - vma->vm_start; -- 1.6.0.2
| |