The patch titled
/dev/mem: make size_inside_page() logic straight
has been removed from the -mm tree. Its filename was
dev-mem-make-size_inside_page-logic-straight.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: /dev/mem: make size_inside_page() logic straight
From: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Also convert more size_inside_page() users.
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/char/mem.c | 34 ++++++++++++----------------------
1 file changed, 12 insertions(+), 22 deletions(-)
diff -puN drivers/char/mem.c~dev-mem-make-size_inside_page-logic-straight drivers/char/mem.c
--- a/drivers/char/mem.c~dev-mem-make-size_inside_page-logic-straight
+++ a/drivers/char/mem.c
@@ -39,12 +39,9 @@ static inline unsigned long size_inside_
{
unsigned long sz;
- if (-start & (PAGE_SIZE - 1))
- sz = -start & (PAGE_SIZE - 1);
- else
- sz = PAGE_SIZE;
+ sz = PAGE_SIZE - (start & (PAGE_SIZE - 1));
- return min_t(unsigned long, sz, size);
+ return min(sz, size);
}
/*
@@ -139,9 +136,7 @@ static ssize_t read_mem(struct file * fi
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
if (p < PAGE_SIZE) {
- sz = PAGE_SIZE - p;
- if (sz > count)
- sz = count;
+ sz = size_inside_page(p, count);
if (sz > 0) {
if (clear_user(buf, sz))
return -EFAULT;
@@ -201,9 +196,7 @@ static ssize_t write_mem(struct file * f
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
if (p < PAGE_SIZE) {
- unsigned long sz = PAGE_SIZE - p;
- if (sz > count)
- sz = count;
+ sz = size_inside_page(p, count);
/* Hmm. Do something? */
buf += sz;
p += sz;
@@ -412,15 +405,14 @@ static ssize_t read_kmem(struct file *fi
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
if (p < PAGE_SIZE && low_count > 0) {
- size_t tmp = PAGE_SIZE - p;
- if (tmp > low_count) tmp = low_count;
- if (clear_user(buf, tmp))
+ sz = size_inside_page(p, low_count);
+ if (clear_user(buf, sz))
return -EFAULT;
- buf += tmp;
- p += tmp;
- read += tmp;
- low_count -= tmp;
- count -= tmp;
+ buf += sz;
+ p += sz;
+ read += sz;
+ low_count -= sz;
+ count -= sz;
}
#endif
while (low_count > 0) {
@@ -480,9 +472,7 @@ do_write_kmem(void *p, unsigned long rea
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
if (realp < PAGE_SIZE) {
- unsigned long sz = PAGE_SIZE - realp;
- if (sz > count)
- sz = count;
+ sz = size_inside_page(realp, count);
/* Hmm. Do something? */
buf += sz;
p += sz;
_
Patches currently in -mm which might be from fengguang.wu@xxxxxxxxx are
origin.patch
linux-next.patch
readahead-add-blk_run_backing_dev.patch
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