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[Qemu-devel] Re: [PATCH v2] Fix integer overflow in block migration band
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] Re: [PATCH v2] Fix integer overflow in block migration bandwidth calculation |
Date: |
Wed, 06 Apr 2011 17:38:38 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
Am 06.04.2011 09:45, schrieb Avishay Traeger:
>
> block_mig_state.reads is an int, and multiplying by BLOCK_SIZE yielded a
> negative number, resulting in a negative bandwidth (running on a 32-bit
> machine). Change order to avoid.
>
> Signed-off-by: Avishay Traeger <address@hidden>
Thanks, applied to the block branch.
> ---
> block-migration.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/block-migration.c b/block-migration.c
> index 8218bac..576e55a 100644
> --- a/block-migration.c
> +++ b/block-migration.c
> @@ -140,7 +140,7 @@ static inline void add_avg_read_time(int64_t time)
> static inline long double compute_read_bwidth(void)
> {
> assert(block_mig_state.total_time != 0);
> - return (block_mig_state.reads * BLOCK_SIZE)/
> block_mig_state.total_time;
> + return (block_mig_state.reads / block_mig_state.total_time) *
> BLOCK_SIZE;
Your lines are still wrapped. I had to fix this up manually.
Kevin