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Message-ID: <erg2ymp6raf7ru5ggj4hrrhet4i762msoqa2ronv4znfhlkc6o@nxu6ygtdfmrj>
Date: Mon, 19 Feb 2024 23:13:57 -0600
From: Lucas De Marchi <lucas.demarchi@...el.com>
To: Yury Norov <yury.norov@...il.com>
CC: <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>, "Andy
Shevchenko" <andriy.shevchenko@...ux.intel.com>, Jani Nikula
<jani.nikula@...ux.intel.com>, <intel-xe@...ts.freedesktop.org>,
<intel-gfx@...ts.freedesktop.org>, Jani Nikula <jani.nikula@...el.com>
Subject: Re: Re: [PATCH v3 2/3] bits: Introduce fixed-type BIT
On Fri, Feb 09, 2024 at 08:53:25AM -0800, Yury Norov wrote:
>On Wed, Feb 07, 2024 at 11:45:20PM -0800, Lucas De Marchi wrote:
>> Implement fixed-type BIT() to help drivers add stricter checks, like was
>> done for GENMASK.
>>
>> Signed-off-by: Lucas De Marchi <lucas.demarchi@...el.com>
>> Acked-by: Jani Nikula <jani.nikula@...el.com>
>
>So I get v1 from Jan.23 in my mailbox, and this one is v3. Did I miss
>a v2? Anyways, please bear my reviewed-by from v1 for this patch.
Jan 23 was actually the v2 and I missed the subject prefix.
My understanding was that you were going to apply this through some
bitmap tree, but checking MAINTAINERS now it seems there's no git tree
associated. So I will just add your r-b and merge this through
drm-xe.
thanks
Lucas De Marchi
>
>Thanks,
>Yury
>
>> ---
>> include/linux/bits.h | 17 +++++++++++++++++
>> 1 file changed, 17 insertions(+)
>>
>> diff --git a/include/linux/bits.h b/include/linux/bits.h
>> index bd56f32de44e..811846ce110e 100644
>> --- a/include/linux/bits.h
>> +++ b/include/linux/bits.h
>> @@ -24,12 +24,16 @@
>> #define GENMASK_INPUT_CHECK(h, l) \
>> (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
>> __is_constexpr((l) > (h)), (l) > (h), 0)))
>> +#define BIT_INPUT_CHECK(type, b) \
>> + ((BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
>> + __is_constexpr(b), (b) >= BITS_PER_TYPE(type), 0))))
>> #else
>> /*
>> * BUILD_BUG_ON_ZERO is not available in h files included from asm files,
>> * disable the input check if that is the case.
>> */
>> #define GENMASK_INPUT_CHECK(h, l) 0
>> +#define BIT_INPUT_CHECK(type, b) 0
>> #endif
>>
>> /*
>> @@ -54,4 +58,17 @@
>> #define GENMASK_U32(h, l) __GENMASK(u32, h, l)
>> #define GENMASK_U64(h, l) __GENMASK(u64, h, l)
>>
>> +/*
>> + * Fixed-type variants of BIT(), with additional checks like __GENMASK(). The
>> + * following examples generate compiler warnings due to shift-count-overflow:
>> + *
>> + * - BIT_U8(8)
>> + * - BIT_U32(-1)
>> + * - BIT_U32(40)
>> + */
>> +#define BIT_U8(b) ((u8)(BIT_INPUT_CHECK(u8, b) + BIT(b)))
>> +#define BIT_U16(b) ((u16)(BIT_INPUT_CHECK(u16, b) + BIT(b)))
>> +#define BIT_U32(b) ((u32)(BIT_INPUT_CHECK(u32, b) + BIT(b)))
>> +#define BIT_U64(b) ((u64)(BIT_INPUT_CHECK(u64, b) + BIT(b)))
>> +
>> #endif /* __LINUX_BITS_H */
>> --
>> 2.43.0
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