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Date: Wed, 19 Jan 2011 09:54:56 +0100
From: Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>
To: Greg KH <gregkh@...e.de>
Cc: Haiyang Zhang <haiyangz@...rosoft.com>,
Hank Janssen <hjanssen@...rosoft.com>,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging/hv/osd: don't reimplement ALIGN macro
On Tue, Jan 18, 2011 at 09:37:15PM -0800, Greg KH wrote:
> On Tue, Jan 18, 2011 at 04:39:11PM +0100, Uwe Kleine-König wrote:
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > ---
> > drivers/staging/hv/osd.h | 5 ++---
> > 1 files changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/staging/hv/osd.h b/drivers/staging/hv/osd.h
> > index ce064e8..61ae54c 100644
> > --- a/drivers/staging/hv/osd.h
> > +++ b/drivers/staging/hv/osd.h
> > @@ -28,10 +28,9 @@
> > #include <linux/workqueue.h>
> >
> > /* Defines */
> > -#define ALIGN_UP(value, align) (((value) & (align-1)) ? \
> > - (((value) + (align-1)) & ~(align-1)) : \
> > - (value))
> > +#define ALIGN_UP(value, align) ALIGN((value), (align))
>
> How about dropping ALIGN_UP entirely and just using the built-in ALIGN()
> macro instead?
Can do.
> > #define ALIGN_DOWN(value, align) ((value) & ~(align-1))
>
> Any chance to get rid of this as well with the ALIGN() macro, or is that
> really not possible?
it would be
#define ALIGN_DOWN(value, align) ALIGN((value) - (align) + 1, (align))
I think, but as it's only used once it might be easier to just use ALIGN
there, too.
BTW, it's used as follows:
#define NUM_PAGES_SPANNED(addr, len) ((ALIGN(addr+len, PAGE_SIZE) - \
ALIGN_DOWN(addr, PAGE_SIZE)) >> \
PAGE_SHIFT)
I wonder if there is already a function yielding this value?
Wouldn't
((addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT) + 1
just work? (At least if len > 0, but for other values the original
macro was wrong, too. The maybe more correct
abs(((addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) + (len > 0)
is probably just overkill.)
Patch below.
Best regards
Uwe
-------------->8------------------
staging/hv/osd: don't reimplement ALIGN macro
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
The ALIGN_DOWN macro was only used in NUM_PAGES_SPANNED. So make the
latter easier and get rid of the former.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
drivers/staging/hv/blkvsc.c | 2 +-
drivers/staging/hv/channel.c | 6 +++---
drivers/staging/hv/hv.c | 4 ++--
drivers/staging/hv/osd.h | 10 +++-------
drivers/staging/hv/storvsc.c | 6 +++---
drivers/staging/hv/storvsc_drv.c | 4 ++--
6 files changed, 14 insertions(+), 18 deletions(-)
diff --git a/drivers/staging/hv/blkvsc.c b/drivers/staging/hv/blkvsc.c
index bc16d91..11a2523 100644
--- a/drivers/staging/hv/blkvsc.c
+++ b/drivers/staging/hv/blkvsc.c
@@ -85,7 +85,7 @@ int blk_vsc_initialize(struct hv_driver *driver)
*/
stor_driver->max_outstanding_req_per_channel =
((stor_driver->ring_buffer_size - PAGE_SIZE) /
- ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET +
+ ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
sizeof(struct vstor_packet) + sizeof(u64),
sizeof(u64)));
diff --git a/drivers/staging/hv/channel.c b/drivers/staging/hv/channel.c
index 45a627d..69e7856 100644
--- a/drivers/staging/hv/channel.c
+++ b/drivers/staging/hv/channel.c
@@ -726,7 +726,7 @@ int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer,
{
struct vmpacket_descriptor desc;
u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen;
- u32 packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64));
+ u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
struct scatterlist bufferlist[3];
u64 aligned_data = 0;
int ret;
@@ -793,7 +793,7 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
((MAX_PAGE_BUFFER_COUNT - pagecount) *
sizeof(struct hv_page_buffer));
packetlen = descsize + bufferlen;
- packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64));
+ packetlen_aligned = ALIGN(packetlen, sizeof(u64));
/* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
@@ -862,7 +862,7 @@ int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) *
sizeof(u64));
packetlen = descsize + bufferlen;
- packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64));
+ packetlen_aligned = ALIGN(packetlen, sizeof(u64));
/* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
diff --git a/drivers/staging/hv/hv.c b/drivers/staging/hv/hv.c
index a34d713..021acba 100644
--- a/drivers/staging/hv/hv.c
+++ b/drivers/staging/hv/hv.c
@@ -267,7 +267,7 @@ int hv_init(void)
hv_context.signal_event_param =
(struct hv_input_signal_event *)
- (ALIGN_UP((unsigned long)
+ (ALIGN((unsigned long)
hv_context.signal_event_buffer,
HV_HYPERCALL_PARAM_ALIGN));
hv_context.signal_event_param->connectionid.asu32 = 0;
@@ -338,7 +338,7 @@ u16 hv_post_message(union hv_connection_id connection_id,
return -1;
aligned_msg = (struct hv_input_post_message *)
- (ALIGN_UP(addr, HV_HYPERCALL_PARAM_ALIGN));
+ (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
aligned_msg->connectionid = connection_id;
aligned_msg->message_type = message_type;
diff --git a/drivers/staging/hv/osd.h b/drivers/staging/hv/osd.h
index 870ef07..85ccb29 100644
--- a/drivers/staging/hv/osd.h
+++ b/drivers/staging/hv/osd.h
@@ -25,16 +25,12 @@
#ifndef _OSD_H_
#define _OSD_H_
+#include <linux/kernel.h>
#include <linux/workqueue.h>
/* Defines */
-#define ALIGN_UP(value, align) (((value) & (align-1)) ? \
- (((value) + (align-1)) & ~(align-1)) : \
- (value))
-#define ALIGN_DOWN(value, align) ((value) & ~(align-1))
-#define NUM_PAGES_SPANNED(addr, len) ((ALIGN_UP(addr+len, PAGE_SIZE) - \
- ALIGN_DOWN(addr, PAGE_SIZE)) >> \
- PAGE_SHIFT)
+#define NUM_PAGES_SPANNED(addr, len) (((addr + len) >> PAGE_SHIFT) - \
+ (addr >> PAGE_SHIFT) + 1)
#define LOWORD(dw) ((unsigned short)(dw))
#define HIWORD(dw) ((unsigned short)(((unsigned int) (dw) >> 16) & 0xFFFF))
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index 9295113..5680fb0 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -437,7 +437,7 @@ static void stor_vsc_on_channel_callback(void *context)
struct storvsc_device *stor_device;
u32 bytes_recvd;
u64 request_id;
- unsigned char packet[ALIGN_UP(sizeof(struct vstor_packet), 8)];
+ unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
struct storvsc_request_extension *request;
int ret;
@@ -452,7 +452,7 @@ static void stor_vsc_on_channel_callback(void *context)
do {
ret = vmbus_recvpacket(device->channel, packet,
- ALIGN_UP(sizeof(struct vstor_packet), 8),
+ ALIGN(sizeof(struct vstor_packet), 8),
&bytes_recvd, &request_id);
if (ret == 0 && bytes_recvd > 0) {
DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx",
@@ -802,7 +802,7 @@ int stor_vsc_initialize(struct hv_driver *driver)
*/
stor_driver->max_outstanding_req_per_channel =
((stor_driver->ring_buffer_size - PAGE_SIZE) /
- ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET +
+ ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
sizeof(struct vstor_packet) + sizeof(u64),
sizeof(u64)));
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 17f1b34..7651ca2 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -434,7 +434,7 @@ static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
struct scatterlist *bounce_sgl;
struct page *page_buf;
- num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT;
+ num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
if (!bounce_sgl)
@@ -720,7 +720,7 @@ static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
}
cmd_request->bounce_sgl_count =
- ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >>
+ ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
PAGE_SHIFT;
/*
--
1.7.2.3
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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