[PATCH] uml: use host AIO support
This patch makes UML use host AIO support when it (and
/usr/include/linux/aio_abi.h) are present. This is only the support, with no
consumers - a consumer is coming in the next patch.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 9f18061..dcd8149 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -31,7 +31,7 @@
#include "kern_util.h"
#include "irq_user.h"
#include "irq_kern.h"
-
+#include "os.h"
/*
* Generic, controller-independent functions:
@@ -168,13 +168,32 @@
}
}
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
+int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *,
+ struct pt_regs *))
+{
+ int fds[2], err;
+
+ err = os_pipe(fds, 1, 1);
+ if(err){
+ printk("init_aio_irq - os_pipe failed, err = %d\n", -err);
+ goto out;
+ }
+
+ err = um_request_irq(irq, fds[0], IRQ_READ, handler,
+ SA_INTERRUPT | SA_SAMPLE_RANDOM, name,
+ (void *) (long) fds[0]);
+ if(err){
+ printk("init_aio_irq - : um_request_irq failed, err = %d\n",
+ err);
+ goto out_close;
+ }
+
+ err = fds[1];
+ goto out;
+
+ out_close:
+ os_close_file(fds[0]);
+ os_close_file(fds[1]);
+ out:
+ return(err);
+}
