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event_notifier: Make event_notifier_init_fd() #ifdef CONFIG_EVENTFD

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Event notifiers are designed for eventfd(2).  They can fall back to
pipes, but according to Paolo, event_notifier_init_fd() really
requires the real thing, and should therefore be under #ifdef
CONFIG_EVENTFD.  Do that.

Its only user is ivshmem, which is currently CONFIG_POSIX.  Narrow it
to CONFIG_EVENTFD.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1458066895-20632-6-git-send-email-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2016-03-15 19:34:20 +01:00
parent ad4929384b
commit 330b58368c
3 changed files with 8 additions and 2 deletions
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6
util/event_notifier-posix.c
View file

@ -20,11 +20,17 @@
#include <sys/eventfd.h>
#endif
#ifdef CONFIG_EVENTFD
/*
* Initialize @e with existing file descriptor @fd.
* @fd must be a genuine eventfd object, emulation with pipe won't do.
*/
void event_notifier_init_fd(EventNotifier *e, int fd)
{
e->rfd = fd;
e->wfd = fd;
}
#endif
int event_notifier_init(EventNotifier *e, int active)
{