linux-kernel - Re: [PATCH v2] perf: CXL: fix CPMU filter value mask length

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Date: Thu, 15 Feb 2024 11:44:57 +0000
From: Will Deacon <will@...nel.org>
To: Hojin Nam <hj96.nam@...sung.com>
Cc: "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
	"jonathan.cameron@...wei.com" <jonathan.cameron@...wei.com>,
	Wonjae Lee <wj28.lee@...sung.com>,
	KyungSan Kim <ks0204.kim@...sung.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mark.rutland@....com" <mark.rutland@....com>
Subject: Re: [PATCH v2] perf: CXL: fix CPMU filter value mask length

Hi Hojin,

On Thu, Feb 15, 2024 at 05:09:06PM +0900, Hojin Nam wrote:
> CPMU filter value is described as 4B length in CXL r3.0 8.2.7.2.2.
> However, it is used as 2B length in code and comments.
> 
> Signed-off-by: Hojin Nam <hj96.nam@...sung.com>
> ---
> 
> Hi Jonathan,
> as you said, I didn't actually hit this. I just found it by simply
> comparing the code to the CXL Spec. I removed Fixes tag and 
> repaired broken sign off, Thank you!
> 
> Changes since v1:
> - Remove Fixes tag (Jonathan)
> - Repair broken sign off (Jonathan)
> 
>  drivers/perf/cxl_pmu.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
> index 365d964b0f6a..ca5e92f28b4a 100644
> --- a/drivers/perf/cxl_pmu.c
> +++ b/drivers/perf/cxl_pmu.c
> @@ -59,7 +59,7 @@
>  #define   CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK     GENMASK_ULL(63, 59)
> 
>  #define CXL_PMU_FILTER_CFG_REG(n, f)   (0x400 + 4 * ((f) + (n) * 8))
> -#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(15, 0)
> +#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(31, 0)

Unfortunately, your patch appears to be whitespace-damaged (missing space,
tabs converted to space) so I'm not able to apply it :(

Will