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Re: [Xen-devel] [PATCH] x86: Hyper-V clock source's offset should be signed
- To: Wei Liu <wl@xxxxxxx>, Xen Development List <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 20 Dec 2019 19:57:07 +0000
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- Cc: Paul Durrant <pdurrant@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <liuwe@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Michael Kelley <mikelley@xxxxxxxxxxxxx>
- Delivery-date: Fri, 20 Dec 2019 19:57:19 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 20/12/2019 19:47, Wei Liu wrote:
> Fixes: 685d16bd5 (x86: implement Hyper-V clock source)
> Signed-off-by: Wei Liu <liuwe@xxxxxxxxxxxxx>
> ---
> I discover this stupid mistake when I work on extracting common code
> from viridian and the clock source implementation.
Does it make a practical difference?
> ---
> xen/arch/x86/time.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
> index a3c9b927e8..bbcc9b10b8 100644
> --- a/xen/arch/x86/time.c
> +++ b/xen/arch/x86/time.c
> @@ -698,7 +698,8 @@ static int64_t __init init_hyperv_timer(struct
> platform_timesource *pts)
>
> static inline uint64_t read_hyperv_timer(void)
Also, this function is only ever accessed via pointer. The inline can't
be satisfied at all.
~Andrew
> {
> - uint64_t scale, offset, ret, tsc;
> + uint64_t scale, ret, tsc;
> + int64_t offset;
> uint32_t seq;
> const struct ms_hyperv_tsc_page *tsc_page = hyperv_tsc;
>
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