Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH v3 5/6] can: c_can: prepare to up the message objects
 number
To:     Dario Binacchi <dariobin@libero.it>
Cc:     linux-kernel@vger.kernel.org,
        Federico Vaga <federico.vaga@gmail.com>,
        Alexander Stein <alexander.stein@systec-electronic.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Oliver Hartkopp <socketcan@hartkopp.net>,
        Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
        Wolfgang Grandegger <wg@grandegger.com>,
        YueHaibing <yuehaibing@huawei.com>,
        Zhang Qilong <zhangqilong3@huawei.com>,
        linux-can@vger.kernel.org, netdev@vger.kernel.org
References: <20210228103856.4089-1-dariobin@libero.it>
 <20210228103856.4089-6-dariobin@libero.it>
 <20210301113805.jylhc373sip7zmed@pengutronix.de>
 <1037673059.602534.1614619302914@mail1.libero.it>
 <20210301194550.6zqmxzcwvzlgjzcj@pengutronix.de>
 <1154674280.137227.1614682252245@mail1.libero.it>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
Autocrypt: addr=mkl@pengutronix.de; prefer-encrypt=mutual; keydata=
 mQINBFFVq30BEACtnSvtXHoeHJxG6nRULcvlkW6RuNwHKmrqoksispp43X8+nwqIFYgb8UaX
 zu8T6kZP2wEIpM9RjEL3jdBjZNCsjSS6x1qzpc2+2ivjdiJsqeaagIgvy2JWy7vUa4/PyGfx
 QyUeXOxdj59DvLwAx8I6hOgeHx2X/ntKAMUxwawYfPZpP3gwTNKc27dJWSomOLgp+gbmOmgc
 6U5KwhAxPTEb3CsT5RicsC+uQQFumdl5I6XS+pbeXZndXwnj5t84M+HEj7RN6bUfV2WZO/AB
 Xt5+qFkC/AVUcj/dcHvZwQJlGeZxoi4veCoOT2MYqfR0ax1MmN+LVRvKm29oSyD4Ts/97cbs
 XsZDRxnEG3z/7Winiv0ZanclA7v7CQwrzsbpCv+oj+zokGuKasofzKdpywkjAfSE1zTyF+8K
 nxBAmzwEqeQ3iKqBc3AcCseqSPX53mPqmwvNVS2GqBpnOfY7Mxr1AEmxdEcRYbhG6Xdn+ACq
 Dq0Db3A++3PhMSaOu125uIAIwMXRJIzCXYSqXo8NIeo9tobk0C/9w3fUfMTrBDtSviLHqlp8
 eQEP8+TDSmRP/CwmFHv36jd+XGmBHzW5I7qw0OORRwNFYBeEuiOIgxAfjjbLGHh9SRwEqXAL
 kw+WVTwh0MN1k7I9/CDVlGvc3yIKS0sA+wudYiselXzgLuP5cQARAQABtCZNYXJjIEtsZWlu
 ZS1CdWRkZSA8bWtsQHBlbmd1dHJvbml4LmRlPokCVAQTAQoAPgIbAwIeAQIXgAULCQgHAwUV
 CgkICwUWAgMBABYhBMFAC6CzmJ5vvH1bXCte4hHFiupUBQJfEWX4BQkQo2czAAoJECte4hHF
 iupUvfMP/iNtiysSr5yU4tbMBzRkGov1/FjurfH1kPweLVHDwiQJOGBz9HgM5+n8boduRv36
 0lU32g3PehN0UHZdHWhygUd6J09YUi2mJo1l2Fz1fQ8elUGUOXpT/xoxNQjslZjJGItCjza8
 +D1DO+0cNFgElcNPa7DFBnglatOCZRiMjo4Wx0i8njEVRU+4ySRU7rCI36KPts+uVmZAMD7V
 3qiR1buYklJaPCJsnXURXYsilBIE9mZRmQjTDVqjLWAit++flqUVmDjaD/pj2AQe2Jcmd2gm
 sYW5P1moz7ACA1GzMjLDmeFtpJOIB7lnDX0F/vvsG3V713/701aOzrXqBcEZ0E4aWeZJzaXw
 n1zVIrl/F3RKrWDhMKTkjYy7HA8hQ9SJApFXsgP334Vo0ea82H3dOU755P89+Eoj0y44MbQX
 7xUy4UTRAFydPl4pJskveHfg4dO6Yf0PGIvVWOY1K04T1C5dpnHAEMvVNBrfTA8qcahRN82V
 /iIGB+KSC2xR79q1kv1oYn0GOnWkvZmMhqGLhxIqHYitwH4Jn5uRfanKYWBk12LicsjRiTyW
 Z9cJf2RgAtQgvMPvmaOL8vB3U4ava48qsRdgxhXMagU618EszVdYRNxGLCqsKVYIDySTrVzu
 ZGs2ibcRhN4TiSZjztWBAe1MaaGk05Ce4h5IdDLbOOxhuQENBF8SDLABCADohJLQ5yffd8Sq
 8Lo9ymzgaLcWboyZ46pY4CCCcAFDRh++QNOJ8l4mEJMNdEa/yrW4lDQDhBWV75VdBuapYoal
 LFrSzDzrqlHGG4Rt4/XOqMo6eSeSLipYBu4Xhg59S9wZOWbHVT/6vZNmiTa3d40+gBg68dQ8
 iqWSU5NhBJCJeLYdG6xxeUEtsq/25N1erxmhs/9TD0sIeX36rFgWldMwKmZPe8pgZEv39Sdd
 B+ykOlRuHag+ySJxwovfdVoWT0o0LrGlHzAYo6/ZSi/Iraa9R/7A1isWOBhw087BMNkRYx36
 B77E4KbyBPx9h3wVyD/R6T0Q3ZNPu6SQLnsWojMzABEBAAGJAjwEGAEKACYWIQTBQAugs5ie
 b7x9W1wrXuIRxYrqVAUCXxIMsAIbDAUJAucGAAAKCRArXuIRxYrqVOu0D/48xSLyVZ5NN2Bb
 yqo3zxdv/PMGJSzM3JqSv7hnMZPQGy9XJaTc5Iz/hyXaNRwpH5X0UNKqhQhlztChuAKZ7iu+
 2VKzq4JJe9qmydRUwylluc4HmGwlIrDNvE0N66pRvC3h8tOVIsippAQlt5ciH74bJYXr0PYw
 Aksw1jugRxMbNRzgGECg4O6EBNaHwDzsVPX1tDj0d9t/7ClzJUy20gg8r9Wm/I/0rcNkQOpV
 RJLDtSbGSusKxor2XYmVtHGauag4YO6Vdq+2RjArB3oNLgSOGlYVpeqlut+YYHjWpaX/cTf8
 /BHtIQuSAEu/WnycpM3Z9aaLocYhbp5lQKL6/bcWQ3udd0RfFR/Gv7eR7rn3evfqNTtQdo4/
 YNmd7P8TS7ALQV/5bNRe+ROLquoAZvhaaa6SOvArcmFccnPeyluX8+o9K3BCdXPwONhsrxGO
 wrPI+7XKMlwWI3O076NqNshh6mm8NIC0mDUr7zBUITa67P3Q2VoPoiPkCL9RtsXdQx5BI9iI
 h/6QlzDxcBdw2TVWyGkVTCdeCBpuRndOMVmfjSWdCXXJCLXO6sYeculJyPkuNvumxgwUiK/H
 AqqdUfy1HqtzP2FVhG5Ce0TeMJepagR2CHPXNg88Xw3PDjzdo+zNpqPHOZVKpLUkCvRv1p1q
 m1qwQVWtAwMML/cuPga78rkBDQRfEXGWAQgAt0Cq8SRiLhWyTqkf16Zv/GLkUgN95RO5ntYM
 fnc2Tr3UlRq2Cqt+TAvB928lN3WHBZx6DkuxRM/Y/iSyMuhzL5FfhsICuyiBs5f3QG70eZx+
 Bdj4I7LpnIAzmBdNWxMHpt0m7UnkNVofA0yH6rcpCsPrdPRJNOLFI6ZqXDQk9VF+AB4HVAJY
 BDU3NAHoyVGdMlcxev0+gEXfBQswEcysAyvzcPVTAqmrDsupnIB2f0SDMROQCLO6F+/cLG4L
 Stbz+S6YFjESyXblhLckTiPURvDLTywyTOxJ7Mafz6ZCene9uEOqyd/h81nZOvRd1HrXjiTE
 1CBw+Dbvbch1ZwGOTQARAQABiQNyBBgBCgAmFiEEwUALoLOYnm+8fVtcK17iEcWK6lQFAl8R
 cZYCGwIFCQLnoRoBQAkQK17iEcWK6lTAdCAEGQEKAB0WIQQreQhYm33JNgw/d6GpyVqK+u3v
 qQUCXxFxlgAKCRCpyVqK+u3vqatQCAC3QIk2Y0g/07xNLJwhWcD7JhIqfe7Qc5Vz9kf8ZpWr
 +6w4xwRfjUSmrXz3s6e/vrQsfdxjVMDFOkyG8c6DWJo0TVm6Ucrf9G06fsjjE/6cbE/gpBkk
 /hOVz/a7UIELT+HUf0zxhhu+C9hTSl8Nb0bwtm6JuoY5AW0LP2KoQ6LHXF9KNeiJZrSzG6WE
 h7nf3KRFS8cPKe+trbujXZRb36iIYUfXKiUqv5xamhohy1hw+7Sy8nLmw8rZPa40bDxX0/Gi
 98eVyT4/vi+nUy1gF1jXgNBSkbTpbVwNuldBsGJsMEa8lXnYuLzn9frLdtufUjjCymdcV/iT
 sFKziU9AX7TLZ5AP/i1QMP9OlShRqERH34ufA8zTukNSBPIBfmSGUe6G2KEWjzzNPPgcPSZx
 Do4jfQ/m/CiiibM6YCa51Io72oq43vMeBwG9/vLdyev47bhSfMLTpxdlDJ7oXU9e8J61iAF7
 vBwerBZL94I3QuPLAHptgG8zPGVzNKoAzxjlaxI1MfqAD9XUM80MYBVjunIQlkU/AubdvmMY
 X7hY1oMkTkC5hZNHLgIsDvWUG0g3sACfqF6gtMHY2lhQ0RxgxAEx+ULrk/svF6XGDe6iveyc
 z5Mg5SUggw3rMotqgjMHHRtB3nct6XqgPXVDGYR7nAkXitG+nyG5zWhbhRDglVZ0mLlW9hij
 z3Emwa94FaDhN2+1VqLFNZXhLwrNC5mlA6LUjCwOL+zb9a07HyjekLyVAdA6bZJ5BkSXJ1CO
 5YeYolFjr4YU7GXcSVfUR6fpxrb8N+yH+kJhY3LmS9vb2IXxneE/ESkXM6a2YAZWfW8sgwTm
 0yCEJ41rW/p3UpTV9wwE2VbGD1XjzVKl8SuAUfjjcGGys3yk5XQ5cccWTCwsVdo2uAcY1MVM
 HhN6YJjnMqbFoHQq0H+2YenTlTBn2Wsp8TIytE1GL6EbaPWbMh3VLRcihlMj28OUWGSERxat
 xlygDG5cBiY3snN3xJyBroh5xk/sHRgOdHpmujnFyu77y4RTZ2W8
Message-ID: <3e02f656-573d-8615-60c7-7c62af615a10@pengutronix.de>
Date:   Tue, 2 Mar 2021 11:56:32 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.12.0
MIME-Version: 1.0
In-Reply-To: <1154674280.137227.1614682252245@mail1.libero.it>
Content-Type: multipart/signed; micalg=pgp-sha512;
 protocol="application/pgp-signature";
 boundary="HVzkvO2wFvndWwHoH5zV90NUDan4VQl8A"
Precedence: bulk

This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
--HVzkvO2wFvndWwHoH5zV90NUDan4VQl8A
Content-Type: multipart/mixed; boundary="NqCD5WZtdBXi0l0B7Gy05QjU2aqXJBIe2";
 protected-headers="v1"
From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Dario Binacchi <dariobin@libero.it>
Cc: linux-kernel@vger.kernel.org, Federico Vaga <federico.vaga@gmail.com>,
 Alexander Stein <alexander.stein@systec-electronic.com>,
 "David S. Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>,
 Oliver Hartkopp <socketcan@hartkopp.net>,
 Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
 Wolfgang Grandegger <wg@grandegger.com>, YueHaibing <yuehaibing@huawei.com>,
 Zhang Qilong <zhangqilong3@huawei.com>, linux-can@vger.kernel.org,
 netdev@vger.kernel.org
Message-ID: <3e02f656-573d-8615-60c7-7c62af615a10@pengutronix.de>
Subject: Re: [PATCH v3 5/6] can: c_can: prepare to up the message objects
 number
References: <20210228103856.4089-1-dariobin@libero.it>
 <20210228103856.4089-6-dariobin@libero.it>
 <20210301113805.jylhc373sip7zmed@pengutronix.de>
 <1037673059.602534.1614619302914@mail1.libero.it>
 <20210301194550.6zqmxzcwvzlgjzcj@pengutronix.de>
 <1154674280.137227.1614682252245@mail1.libero.it>
In-Reply-To: <1154674280.137227.1614682252245@mail1.libero.it>

--NqCD5WZtdBXi0l0B7Gy05QjU2aqXJBIe2
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: quoted-printable

On 3/2/21 11:50 AM, Dario Binacchi wrote:
> Hi Marc,
>=20
>> Il 01/03/2021 20:45 Marc Kleine-Budde <mkl@pengutronix.de> ha scritto:=

>>
>> =20
>> On 01.03.2021 18:21:42, Dario Binacchi wrote:
>>>>> @@ -730,7 +728,7 @@ static void c_can_do_tx(struct net_device *dev)=

>>>>>  	while ((idx =3D ffs(pend))) {
>>>>>  		idx--;
>>>>>  		pend &=3D ~(1 << idx);
>>>>> -		obj =3D idx + C_CAN_MSG_OBJ_TX_FIRST;
>>>>> +		obj =3D idx + priv->msg_obj_tx_first;
>>>>>  		c_can_inval_tx_object(dev, IF_TX, obj);
>>>>>  		can_get_echo_skb(dev, idx, NULL);
>>>>>  		bytes +=3D priv->dlc[idx];
>>>>> @@ -740,7 +738,7 @@ static void c_can_do_tx(struct net_device *dev)=

>>>>>  	/* Clear the bits in the tx_active mask */
>>>>>  	atomic_sub(clr, &priv->tx_active);
>>>>> =20
>>>>> -	if (clr & (1 << (C_CAN_MSG_OBJ_TX_NUM - 1)))
>>>>> +	if (clr & (1 << (priv->msg_obj_tx_num - 1)))
>>>>
>>>> Do we need 1UL here, too?
>>>
>>> Do you agree if I use the BIT macro ?
>>
>> No, please use GENMASK(priv->msg_obj_tx_num, 0) here.
>=20
> In case of 64 message objects, msg_obj_tx_num =3D 32, and 1 << (priv->m=
sg_obj_tx_num - 1) =3D 0x80000000.=20
> GENMASK(priv->msg_obj_tx_num, 0) =3D 0.=20
> BIT(priv->msg_obj_tx_num - 1) =3D 0x80000000.

Doh! I've misread where the -1 is places.

Marc

--=20
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


--NqCD5WZtdBXi0l0B7Gy05QjU2aqXJBIe2--

--HVzkvO2wFvndWwHoH5zV90NUDan4VQl8A
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----

iQEzBAEBCgAdFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAmA+GeAACgkQqclaivrt
76kWtQf/QKPLMn0MnWkf4a0CdFhyE/5rEjO6AsqAQDSPn0Noz3FARXuZICAMq6ks
weKLtxVy4vzaXinyf+9fpY12p0/bX4IQleQY5HMTvBLrgPjm0yO1bLg/0pcqb+0m
s0yzznF9X7mqR+UVKLatuQoklbbzdieYLpg1A7NhVIfcBiSUJXLkvHJtWGVaF+TO
yrLaXTnzGiiDAVmxayN3uzGXRTZ3enl9Z3dl97jfTgQQ7yuDW6EB4X1n03+xqmEs
2kCbjf2udpwmFx31bEwyj8Zum9Fpo6oTGATc2/lHqlDuCYNHT3dtbn9gJytsi8l8
x7WHvpc1GNY0VT3ZCIPRTT3RZiivzg==
=YzP6
-----END PGP SIGNATURE-----

--HVzkvO2wFvndWwHoH5zV90NUDan4VQl8A--