lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

eventfd: revised interface and cleanups

Browse Source 
Change the eventfd interface to de-couple the eventfd memory context, from
the file pointer instance.

Without such change, there is no clean way to racely free handle the
POLLHUP event sent when the last instance of the file* goes away.  Also,
now the internal eventfd APIs are using the eventfd context instead of the
file*.

This patch is required by KVM's IRQfd code, which is still under
development.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Avi Kivity <avi@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davide Libenzi
2009-06-30 11:41:11 -07:00
committed by Linus Torvalds
parent f7c2df9b55
commit 133890103b
6 changed files with 149 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/lguest/lg.h
View File

@@ -82,7 +82,7 @@ struct lg_cpu {
struct lg_eventfd {
unsigned long addr;
struct file *event;
struct eventfd_ctx *event;
};
struct lg_eventfd_map {

4
drivers/lguest/lguest_user.c
View File

@@ -50,7 +50,7 @@ static int add_eventfd(struct lguest *lg, unsigned long addr, int fd)
/* Now append new entry. */
new->map[new->num].addr = addr;
new->map[new->num].event = eventfd_fget(fd);
new->map[new->num].event = eventfd_ctx_fdget(fd);
if (IS_ERR(new->map[new->num].event)) {
kfree(new);
return PTR_ERR(new->map[new->num].event);
@@ -357,7 +357,7 @@ static int close(struct inode *inode, struct file *file)
/* Release any eventfds they registered. */
for (i = 0; i < lg->eventfds->num; i++)
fput(lg->eventfds->map[i].event);
eventfd_ctx_put(lg->eventfds->map[i].event);
kfree(lg->eventfds);
/* If lg->dead doesn't contain an error code it will be NULL or a