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From: Mark Rutland <mark.rutland@arm.com>
To: Steven Price <steven.price@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, andre.przywara@arm.com,
	Jaxson.Han@arm.com, robin.murphy@arm.com,
	vladimir.murzin@arm.com, Wei.Chen@arm.com
Subject: Re: [bootwrapper PATCH v2 02/13] Add bit-field macros
Date: Mon, 17 Jan 2022 13:28:04 +0000	[thread overview]
Message-ID: <20220117132804.GE87485@C02TD0UTHF1T.local> (raw)
In-Reply-To: <253b79f8-9c8b-4d8d-4f60-2ac74d763c73@arm.com>

On Mon, Jan 17, 2022 at 12:11:36PM +0000, Steven Price wrote:
> On 14/01/2022 10:56, Mark Rutland wrote:
> > +/*
> > + * Insert the least significant bits of `val` into the bit-field described by
> > + * the contiguous set of bits in `mask`.
> > + *
> > + * For example:
> > + * - BITS_INSERT(BITS(3, 0), 0xA)   is 0x000A
> > + * - BITS_INSERT(BITS(15, 12), 0xA) is 0xA000
> > + * - BITS_INSERT(BIT(15), 0xF)      is 0x1000
> 
>     * - BITS_INSERT(BIT(35), 0x1)      is 0x0
> 
> ... which might be surprising!
> 
> of course BITS_INSERT(BIT(35), ULL(0x1)) works, but I feel either the
> description above needs to signpost this gotcha, or a cast is needed below.
> 
> AFAICT this macro isn't actually used in your series.

Good point; I'll either add the cast or drop that for now.

Thanks,
Mark.

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  reply	other threads:[~2022-01-17 13:29 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-14 10:56 [bootwrapper PATCH v2 00/13] Cleanups and improvements Mark Rutland
2022-01-14 10:56 ` [bootwrapper PATCH v2 01/13] Document entry requirements Mark Rutland
2022-01-14 10:56 ` [bootwrapper PATCH v2 02/13] Add bit-field macros Mark Rutland
2022-01-17 12:11   ` Steven Price
2022-01-17 13:28     ` Mark Rutland [this message]
2022-01-14 10:56 ` [bootwrapper PATCH v2 03/13] aarch64: add system register accessors Mark Rutland
2022-01-14 15:32   ` Andre Przywara
2022-01-14 10:56 ` [bootwrapper PATCH v2 04/13] aarch32: add coprocessor accessors Mark Rutland
2022-01-14 10:56 ` [bootwrapper PATCH v2 05/13] aarch64: add mov_64 macro Mark Rutland
2022-01-14 15:50   ` Andre Przywara
2022-01-14 10:56 ` [bootwrapper PATCH v2 06/13] aarch64: initialize SCTLR_ELx for the boot-wrapper Mark Rutland
2022-01-14 18:12   ` Andre Przywara
2022-01-17 12:15     ` Mark Rutland
2022-01-17 13:05       ` Mark Rutland
2022-01-18 12:37         ` Andre Przywara
2022-01-25 13:32           ` Mark Rutland
2022-01-19 12:42       ` Mark Rutland
2022-01-14 10:56 ` [bootwrapper PATCH v2 07/13] Rework common init C code Mark Rutland
2022-01-17 16:23   ` Andre Przywara
2022-01-14 10:56 ` [bootwrapper PATCH v2 08/13] Announce boot-wrapper mode / exception level Mark Rutland
2022-01-17 14:39   ` Andre Przywara
2022-01-17 15:50     ` Mark Rutland
2022-01-14 10:56 ` [bootwrapper PATCH v2 09/13] aarch64: move the bulk of EL3 initialization to C Mark Rutland
2022-01-17 14:31   ` Andre Przywara
2022-01-17 18:08     ` Mark Rutland
2022-01-17 18:31       ` Andre Przywara
2022-01-18 16:50         ` Mark Brown
2022-01-19 15:22           ` Mark Rutland
2022-01-14 10:56 ` [bootwrapper PATCH v2 10/13] aarch32: move the bulk of Secure PL1 " Mark Rutland
2022-01-17 14:52   ` Andre Przywara
2022-01-14 10:56 ` [bootwrapper PATCH v2 11/13] Announce locations of memory objects Mark Rutland
2022-01-14 15:30   ` Andre Przywara
2022-01-14 16:04     ` Robin Murphy
2022-01-14 16:30       ` Mark Rutland
2022-01-14 16:21     ` Mark Rutland
2022-01-17 14:59   ` Andre Przywara
2022-01-14 10:56 ` [bootwrapper PATCH v2 12/13] Rework bootmethod initialization Mark Rutland
2022-01-17 17:43   ` Andre Przywara
2022-01-25 14:00     ` Mark Rutland
2022-01-14 10:56 ` [bootwrapper PATCH v2 13/13] Unify start_el3 & start_no_el3 Mark Rutland
2022-01-17 17:43   ` Andre Przywara
2022-01-14 15:09 ` [bootwrapper PATCH v2 00/13] Cleanups and improvements Andre Przywara
2022-01-14 15:23   ` Mark Rutland

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