linux-kernel - Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy)

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Date:	Thu, 26 Apr 2007 13:16:45 +0200
From:	Pavel Machek <pavel@....cz>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Con Kolivas <kernel@...ivas.org>,
	suspend2-devel@...ts.suspend2.net, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy)

Hi!

> > Does this seem to help?
> 
> No idea, I haven't actually tried it yet, last time I tried uswsusp on
> my 32/32 machine it didn't work due to endian problems that were
> supposed to be resolved but I haven't had a chance to pick all the bits
> together that you need.

This one should prevent ioctl numbers changing, too.

diff --git a/kernel/power/power.h b/kernel/power/power.h
index eb461b8..a18b85a 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -114,23 +114,23 @@ extern int snapshot_image_loaded(struct 
  * SNAPSHOT_SET_SWAP_AREA ioctl
  */
 struct resume_swap_area {
-	loff_t offset;
+	u_int64_t offset;
 	u_int32_t dev;
 } __attribute__((packed));
 
 #define SNAPSHOT_IOC_MAGIC	'3'
 #define SNAPSHOT_FREEZE			_IO(SNAPSHOT_IOC_MAGIC, 1)
 #define SNAPSHOT_UNFREEZE		_IO(SNAPSHOT_IOC_MAGIC, 2)
-#define SNAPSHOT_ATOMIC_SNAPSHOT	_IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
+#define SNAPSHOT_ATOMIC_SNAPSHOT	_IOW(SNAPSHOT_IOC_MAGIC, 3, u32) /* void * */
 #define SNAPSHOT_ATOMIC_RESTORE		_IO(SNAPSHOT_IOC_MAGIC, 4)
 #define SNAPSHOT_FREE			_IO(SNAPSHOT_IOC_MAGIC, 5)
-#define SNAPSHOT_SET_IMAGE_SIZE		_IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
-#define SNAPSHOT_AVAIL_SWAP		_IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
-#define SNAPSHOT_GET_SWAP_PAGE		_IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
+#define SNAPSHOT_SET_IMAGE_SIZE		_IOW(SNAPSHOT_IOC_MAGIC, 6, u32) /* unsigned long */
+#define SNAPSHOT_AVAIL_SWAP		_IOR(SNAPSHOT_IOC_MAGIC, 7, u32) /* void * */
+#define SNAPSHOT_GET_SWAP_PAGE		_IOR(SNAPSHOT_IOC_MAGIC, 8, u32) /* void * */
 #define SNAPSHOT_FREE_SWAP_PAGES	_IO(SNAPSHOT_IOC_MAGIC, 9)
-#define SNAPSHOT_SET_SWAP_FILE		_IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
+#define SNAPSHOT_SET_SWAP_FILE		_IOW(SNAPSHOT_IOC_MAGIC, 10, u32) /* unsigned int */
 #define SNAPSHOT_S2RAM			_IO(SNAPSHOT_IOC_MAGIC, 11)
-#define SNAPSHOT_PMOPS			_IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
+#define SNAPSHOT_PMOPS			_IOW(SNAPSHOT_IOC_MAGIC, 12, u32) /* unsigned int */
 #define SNAPSHOT_SET_SWAP_AREA		_IOW(SNAPSHOT_IOC_MAGIC, 13, \
 							struct resume_swap_area)
 #define SNAPSHOT_IOC_MAXNR	13
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 558e18e..d0730c1 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -215,8 +215,7 @@ static int snapshot_ioctl(struct inode *
 {
 	int error = 0;
 	struct snapshot_data *data;
-	loff_t avail;
-	sector_t offset;
+	u64 avail, offset;
 
 	if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
 		return -ENOTTY;
@@ -286,7 +285,7 @@ static int snapshot_ioctl(struct inode *
 	case SNAPSHOT_AVAIL_SWAP:
 		avail = count_swap_pages(data->swap, 1);
 		avail <<= PAGE_SHIFT;
-		error = put_user(avail, (loff_t __user *)arg);
+		error = put_user(avail, (u64 __user *)arg);
 		break;
 
 	case SNAPSHOT_GET_SWAP_PAGE:
@@ -304,7 +303,7 @@ static int snapshot_ioctl(struct inode *
 		offset = alloc_swapdev_block(data->swap, data->bitmap);
 		if (offset) {
 			offset <<= PAGE_SHIFT;
-			error = put_user(offset, (sector_t __user *)arg);
+			error = put_user(offset, (u64 __user *)arg);
 		} else {
 			error = -ENOSPC;
 		}




-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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