Re: [PATCH 3.12-rc7] KVM: Fix modprobe failure for kvm_intel/kvm_amd

From: Raghavendra K T
Date: Wed Oct 30 2013 - 11:39:02 EST

On 10/30/2013 07:53 PM, Greg KH wrote:

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index a0e2a8a..e475fdb 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -622,7 +622,7 @@ static int __init kvm_spinlock_debugfs(void)

d_kvm = kvm_init_debugfs();
if (d_kvm == NULL)
- return -ENOMEM;
+ return -EEXIST;

Why even error out at all here? You should never care about debugfs
file creation return values, so why pass any error back up the stack?

We could change this to return 0, but we will still be left with
kvm_main.c: kvm_init_debug() function which creates the kvm debugfs
directory. (I thought Paolo and Gleb's ack would be needed for
that change since it would be a bigger decision for me)

So I just made the patch to fix only Linus's concern.

But sorry that I did not make that explicit. (infact module insertion error was because of successful creation of kvm directory in above code
and then error coming from kvm_init_debug() in kvm_main.c).

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