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lguest: update commentry

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Every so often, after code shuffles, I need to go through and unbitrot
the Lguest Journey (see drivers/lguest/README).  Since we now use RCU in
a simple form in one place I took the opportunity to expand that explanation.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Rusty Russell
2009-07-30 16:03:45 -06:00
parent 2e04ef7691
commit a91d74a3c4
11 changed files with 399 additions and 112 deletions
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7
drivers/lguest/core.c
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@@ -217,10 +217,15 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
/*
* It's possible the Guest did a NOTIFY hypercall to the
* Launcher, in which case we return from the read() now.
* Launcher.
*/
if (cpu->pending_notify) {
/*
* Does it just needs to write to a registered
* eventfd (ie. the appropriate virtqueue thread)?
*/
if (!send_notify_to_eventfd(cpu)) {
/* OK, we tell the main Laucher. */
if (put_user(cpu->pending_notify, user))
return -EFAULT;
return sizeof(cpu->pending_notify);