* [PATCH 1/3] devmem: make size_inside_page() logic straight
2009-09-12 15:20 [PATCH 0/3] more /dev/[k]mem cleanups Wu Fengguang
@ 2009-09-12 15:20 ` Wu Fengguang
2009-09-12 15:20 ` [PATCH 2/3] devmem: remove the "written" variable in write_kmem() Wu Fengguang
2009-09-12 15:20 ` [PATCH 3/3] devmem: remove redundant parameter from do_write_kmem() Wu Fengguang
2 siblings, 0 replies; 6+ messages in thread
From: Wu Fengguang @ 2009-09-12 15:20 UTC (permalink / raw)
To: Andrew Morton
Cc: Andi Kleen, Avi Kivity, Greg Kroah-Hartman, Johannes Berg,
Marcelo Tosatti, Mark Brown, Wu Fengguang, LKML
[-- Attachment #1: kmem-size_inside_page.patch --]
[-- Type: text/plain, Size: 2553 bytes --]
Also convert more size_inside_page() users.
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Avi Kivity <avi@qumranet.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
drivers/char/mem.c | 34 ++++++++++++----------------------
1 file changed, 12 insertions(+), 22 deletions(-)
--- linux-mm.orig/drivers/char/mem.c 2009-09-12 23:01:24.000000000 +0800
+++ linux-mm/drivers/char/mem.c 2009-09-12 23:01:25.000000000 +0800
@@ -40,12 +40,9 @@ 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);
}
/*
@@ -137,9 +134,7 @@ 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;
@@ -202,9 +197,7 @@ 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;
@@ -416,15 +409,14 @@ 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) {
@@ -484,9 +476,7 @@ 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;
--
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH 2/3] devmem: remove the "written" variable in write_kmem()
2009-09-12 15:20 [PATCH 0/3] more /dev/[k]mem cleanups Wu Fengguang
2009-09-12 15:20 ` [PATCH 1/3] devmem: make size_inside_page() logic straight Wu Fengguang
@ 2009-09-12 15:20 ` Wu Fengguang
2009-09-12 15:20 ` [PATCH 3/3] devmem: remove redundant parameter from do_write_kmem() Wu Fengguang
2 siblings, 0 replies; 6+ messages in thread
From: Wu Fengguang @ 2009-09-12 15:20 UTC (permalink / raw)
To: Andrew Morton
Cc: Andi Kleen, Avi Kivity, Greg Kroah-Hartman, Johannes Berg,
Marcelo Tosatti, Mark Brown, Wu Fengguang, LKML
[-- Attachment #1: kmem-remove-written.patch --]
[-- Type: text/plain, Size: 2717 bytes --]
Also rename "len" to "sz". No behavior change.
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Avi Kivity <avi@qumranet.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
drivers/char/mem.c | 48 ++++++++++++++++++-------------------------
1 file changed, 21 insertions(+), 27 deletions(-)
--- linux-mm.orig/drivers/char/mem.c 2009-09-12 23:03:41.000000000 +0800
+++ linux-mm/drivers/char/mem.c 2009-09-12 23:14:33.000000000 +0800
@@ -444,19 +444,18 @@ static ssize_t read_kmem(struct file *fi
if (!kbuf)
return -ENOMEM;
while (count > 0) {
- int len = size_inside_page(p, count);
-
- len = vread(kbuf, (char *)p, len);
- if (!len)
+ sz = size_inside_page(p, count);
+ sz = vread(kbuf, (char *)p, sz);
+ if (!sz)
break;
- if (copy_to_user(buf, kbuf, len)) {
+ if (copy_to_user(buf, kbuf, sz)) {
free_page((unsigned long)kbuf);
return -EFAULT;
}
- count -= len;
- buf += len;
- read += len;
- p += len;
+ count -= sz;
+ buf += sz;
+ read += sz;
+ p += sz;
}
free_page((unsigned long)kbuf);
}
@@ -526,19 +525,14 @@ static ssize_t write_kmem(struct file *
unsigned long p = *ppos;
ssize_t wrote = 0;
ssize_t virtr = 0;
- ssize_t written;
char * kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */
if (p < (unsigned long) high_memory) {
-
- wrote = count;
- if (count > (unsigned long) high_memory - p)
- wrote = (unsigned long) high_memory - p;
-
- written = do_write_kmem((void*)p, p, buf, wrote, ppos);
- if (written != wrote)
- return written;
- wrote = written;
+ unsigned long to_write = min_t(unsigned long, count,
+ (unsigned long)high_memory - p);
+ wrote = do_write_kmem((void *)p, p, buf, to_write, ppos);
+ if (wrote != to_write)
+ return wrote;
p += wrote;
buf += wrote;
count -= wrote;
@@ -549,20 +543,20 @@ static ssize_t write_kmem(struct file *
if (!kbuf)
return wrote ? wrote : -ENOMEM;
while (count > 0) {
- int len = size_inside_page(p, count);
+ unsigned long sz = size_inside_page(p, count);
- written = copy_from_user(kbuf, buf, len);
- if (written) {
+ sz = copy_from_user(kbuf, buf, sz);
+ if (sz) {
if (wrote + virtr)
break;
free_page((unsigned long)kbuf);
return -EFAULT;
}
- len = vwrite(kbuf, (char *)p, len);
- count -= len;
- buf += len;
- virtr += len;
- p += len;
+ sz = vwrite(kbuf, (char *)p, sz);
+ count -= sz;
+ buf += sz;
+ virtr += sz;
+ p += sz;
}
free_page((unsigned long)kbuf);
}
--
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH 3/3] devmem: remove redundant parameter from do_write_kmem()
2009-09-12 15:20 [PATCH 0/3] more /dev/[k]mem cleanups Wu Fengguang
2009-09-12 15:20 ` [PATCH 1/3] devmem: make size_inside_page() logic straight Wu Fengguang
2009-09-12 15:20 ` [PATCH 2/3] devmem: remove the "written" variable in write_kmem() Wu Fengguang
@ 2009-09-12 15:20 ` Wu Fengguang
2009-09-12 15:30 ` Daniel Walker
2 siblings, 1 reply; 6+ messages in thread
From: Wu Fengguang @ 2009-09-12 15:20 UTC (permalink / raw)
To: Andrew Morton
Cc: Andi Kleen, Avi Kivity, Greg Kroah-Hartman, Johannes Berg,
Marcelo Tosatti, Mark Brown, Wu Fengguang, LKML
[-- Attachment #1: kmem-remove-realp.patch --]
[-- Type: text/plain, Size: 2233 bytes --]
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Avi Kivity <avi@qumranet.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
drivers/char/mem.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
--- linux-mm.orig/drivers/char/mem.c 2009-09-12 23:17:12.000000000 +0800
+++ linux-mm/drivers/char/mem.c 2009-09-12 23:17:13.000000000 +0800
@@ -465,7 +465,7 @@ static ssize_t read_kmem(struct file *fi
static inline ssize_t
-do_write_kmem(void *p, unsigned long realp, const char __user * buf,
+do_write_kmem(unsigned long p, const char __user * buf,
size_t count, loff_t *ppos)
{
ssize_t written, sz;
@@ -474,12 +474,11 @@ do_write_kmem(void *p, unsigned long rea
written = 0;
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
- if (realp < PAGE_SIZE) {
- sz = size_inside_page(realp, count);
+ if (p < PAGE_SIZE) {
+ sz = size_inside_page(p, count);
/* Hmm. Do something? */
buf += sz;
p += sz;
- realp += sz;
count -= sz;
written += sz;
}
@@ -488,14 +487,14 @@ do_write_kmem(void *p, unsigned long rea
while (count > 0) {
char *ptr;
- sz = size_inside_page(realp, count);
+ sz = size_inside_page(p, count);
/*
* On ia64 if a page has been mapped somewhere as
* uncached, then it must also be accessed uncached
* by the kernel or data corruption may occur
*/
- ptr = xlate_dev_kmem_ptr(p);
+ ptr = xlate_dev_kmem_ptr((char *)p);
copied = copy_from_user(ptr, buf, sz);
if (copied) {
@@ -506,7 +505,6 @@ do_write_kmem(void *p, unsigned long rea
}
buf += sz;
p += sz;
- realp += sz;
count -= sz;
written += sz;
}
@@ -530,7 +528,7 @@ static ssize_t write_kmem(struct file *
if (p < (unsigned long) high_memory) {
unsigned long to_write = min_t(unsigned long, count,
(unsigned long)high_memory - p);
- wrote = do_write_kmem((void *)p, p, buf, to_write, ppos);
+ wrote = do_write_kmem(p, buf, to_write, ppos);
if (wrote != to_write)
return wrote;
p += wrote;
--
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 3/3] devmem: remove redundant parameter from do_write_kmem()
2009-09-12 15:20 ` [PATCH 3/3] devmem: remove redundant parameter from do_write_kmem() Wu Fengguang
@ 2009-09-12 15:30 ` Daniel Walker
2009-09-12 15:36 ` Wu Fengguang
0 siblings, 1 reply; 6+ messages in thread
From: Daniel Walker @ 2009-09-12 15:30 UTC (permalink / raw)
To: Wu Fengguang
Cc: Andrew Morton, Andi Kleen, Avi Kivity, Greg Kroah-Hartman,
Johannes Berg, Marcelo Tosatti, Mark Brown, LKML
On Sat, 2009-09-12 at 23:20 +0800, Wu Fengguang wrote:
> static inline ssize_t
> -do_write_kmem(void *p, unsigned long realp, const char __user * buf,
> +do_write_kmem(unsigned long p, const char __user * buf,
> size_t count, loff_t *ppos)
> {
There's one style issue in the block above. Could you run your patches
through checkpatch and fix whatever errors it reports?
Daniel
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 3/3] devmem: remove redundant parameter from do_write_kmem()
2009-09-12 15:30 ` Daniel Walker
@ 2009-09-12 15:36 ` Wu Fengguang
0 siblings, 0 replies; 6+ messages in thread
From: Wu Fengguang @ 2009-09-12 15:36 UTC (permalink / raw)
To: Daniel Walker
Cc: Andrew Morton, Andi Kleen, Avi Kivity, Greg Kroah-Hartman,
Johannes Berg, Marcelo Tosatti, Mark Brown, LKML
On Sat, Sep 12, 2009 at 11:30:54PM +0800, Daniel Walker wrote:
> On Sat, 2009-09-12 at 23:20 +0800, Wu Fengguang wrote:
> > static inline ssize_t
> > -do_write_kmem(void *p, unsigned long realp, const char __user * buf,
> > +do_write_kmem(unsigned long p, const char __user * buf,
> > size_t count, loff_t *ppos)
> > {
>
> There's one style issue in the block above. Could you run your patches
> through checkpatch and fix whatever errors it reports?
Thanks for catching it! Here is the updated patch.
(I ran checkpatch against the first two bugs but forgot this last one..)
--
devmem: remove redundant parameter from do_write_kmem()
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Avi Kivity <avi@qumranet.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Daniel Walker <dwalker@fifo99.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
drivers/char/mem.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
--- linux-mm.orig/drivers/char/mem.c 2009-09-12 23:17:12.000000000 +0800
+++ linux-mm/drivers/char/mem.c 2009-09-12 23:35:18.000000000 +0800
@@ -465,7 +465,7 @@ static ssize_t read_kmem(struct file *fi
static inline ssize_t
-do_write_kmem(void *p, unsigned long realp, const char __user * buf,
+do_write_kmem(unsigned long p, const char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t written, sz;
@@ -474,12 +474,11 @@ do_write_kmem(void *p, unsigned long rea
written = 0;
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
- if (realp < PAGE_SIZE) {
- sz = size_inside_page(realp, count);
+ if (p < PAGE_SIZE) {
+ sz = size_inside_page(p, count);
/* Hmm. Do something? */
buf += sz;
p += sz;
- realp += sz;
count -= sz;
written += sz;
}
@@ -488,14 +487,14 @@ do_write_kmem(void *p, unsigned long rea
while (count > 0) {
char *ptr;
- sz = size_inside_page(realp, count);
+ sz = size_inside_page(p, count);
/*
* On ia64 if a page has been mapped somewhere as
* uncached, then it must also be accessed uncached
* by the kernel or data corruption may occur
*/
- ptr = xlate_dev_kmem_ptr(p);
+ ptr = xlate_dev_kmem_ptr((char *)p);
copied = copy_from_user(ptr, buf, sz);
if (copied) {
@@ -506,7 +505,6 @@ do_write_kmem(void *p, unsigned long rea
}
buf += sz;
p += sz;
- realp += sz;
count -= sz;
written += sz;
}
@@ -530,7 +528,7 @@ static ssize_t write_kmem(struct file *
if (p < (unsigned long) high_memory) {
unsigned long to_write = min_t(unsigned long, count,
(unsigned long)high_memory - p);
- wrote = do_write_kmem((void *)p, p, buf, to_write, ppos);
+ wrote = do_write_kmem(p, buf, to_write, ppos);
if (wrote != to_write)
return wrote;
p += wrote;
^ permalink raw reply [flat|nested] 6+ messages in thread