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util/userfaultfd: Remove unused uffd_poll_events

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uffd_poll_events has been unused since it was added; it's also
just a wrapper around a plain old poll call, so doesn't add anything.

Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240919134626.166183-8-dave@treblig.org
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2024-09-19 14:46:26 +01:00 committed by Peter Xu
parent 3ba55a33e8
commit ccf6b78275
2 changed files with 0 additions and 29 deletions
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1
include/qemu/userfaultfd.h
View File

@ -39,7 +39,6 @@ int uffd_copy_page(int uffd_fd, void *dst_addr, void *src_addr,
int uffd_zero_page(int uffd_fd, void *addr, uint64_t length, bool dont_wake); int uffd_zero_page(int uffd_fd, void *addr, uint64_t length, bool dont_wake);
int uffd_wakeup(int uffd_fd, void *addr, uint64_t length); int uffd_wakeup(int uffd_fd, void *addr, uint64_t length);
int uffd_read_events(int uffd_fd, struct uffd_msg *msgs, int count); int uffd_read_events(int uffd_fd, struct uffd_msg *msgs, int count);
bool uffd_poll_events(int uffd_fd, int tmo);
#endif /* CONFIG_LINUX */ #endif /* CONFIG_LINUX */

28
util/userfaultfd.c
View File

@ -358,31 +358,3 @@ int uffd_read_events(int uffd_fd, struct uffd_msg *msgs, int count)
return (int) (res / sizeof(struct uffd_msg)); return (int) (res / sizeof(struct uffd_msg));
} }
/**
* uffd_poll_events: poll UFFD file descriptor for read
*
* Returns true if events are available for read, false otherwise
*
* @uffd_fd: UFFD file descriptor
* @tmo: timeout value
*/
bool uffd_poll_events(int uffd_fd, int tmo)
{
int res;
struct pollfd poll_fd = { .fd = uffd_fd, .events = POLLIN, .revents = 0 };
do {
res = poll(&poll_fd, 1, tmo);
} while (res < 0 && errno == EINTR);
if (res == 0) {
return false;
}
if (res < 0) {
error_report("uffd_poll_events() failed: errno=%i", errno);
return false;
}
return (poll_fd.revents & POLLIN) != 0;
}