linux-kernel - Re: [PATCH v3 2/4] KVM: x86: Use vector-hashing to deliver lowest-priority interrupts

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Date:	Mon, 25 Jan 2016 16:20:41 +0100
From:	Radim Krcmár <rkrcmar@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	"Wu, Feng" <feng.wu@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH v3 2/4] KVM: x86: Use vector-hashing to deliver
 lowest-priority interrupts

2016-01-25 13:25+0100, Paolo Bonzini:
> On 22/01/2016 15:01, Radim Krcmár wrote:
>>>         for (i = 0; i <= mod; i++) {
>>>                 idx = find_next_bit(bitmap, bitmap_size, idx + 1);
>>>                 BUG_ON(idx == bitmap_size);
>>>         }
> 
> WARN_ON, not BUG_ON.

Callers don't check the return value for an error, because every error
is a BUG now.  I think that we should check if we return bitmap_size.
(Current paths could dereference NULL or throw unrelated warnings.)

Also, WARN_ON_ONCE?