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[PATCH] uml: use host AIO support

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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>
This commit is contained in:
Jeff Dike
2005-09-03 15:57:45 -07:00
committed by Linus Torvalds
parent 30f7dabb08
commit 75e5584c89
6 changed files with 475 additions and 15 deletions
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41
arch/um/kernel/irq.c
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@@ -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 @@ void __init init_IRQ(void)
}
}
/*
* 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);
}