linux-kernel - Re: [PATCH] KVM: selftests: Track width of arm64's timer counter as "int", not "uint64

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Message-ID: <175897248729.2798309.11771785872259733527.b4-ty@kernel.org>
Date: Sat, 27 Sep 2025 12:29:01 +0100
From: Marc Zyngier <maz@...nel.org>
To: Oliver Upton <oliver.upton@...ux.dev>,
	Sean Christopherson <seanjc@...gle.com>
Cc: linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Sebastian Ott <sebott@...hat.com>
Subject: Re: [PATCH] KVM: selftests: Track width of arm64's timer counter as "int", not "uint64_t"

On Fri, 26 Sep 2025 08:58:38 -0700, Sean Christopherson wrote:
> Store the width of arm64's timer counter as an "int", not a "uint64_t".
> ilog2() returns an "int", and more importantly using what is an "unsigned
> long" under the hood makes clang unhappy due to a type mismatch when
> clamping the width to a sane value.
> 
>   arm64/arch_timer_edge_cases.c:1032:10: error: comparison of distinct pointer types
>      ('typeof (width) *' (aka 'unsigned long *') and 'typeof (56) *' (aka 'int *'))
>      [-Werror,-Wcompare-distinct-pointer-types]
>    1032 |         width = clamp(width, 56, 64);
>         |                 ^~~~~~~~~~~~~~~~~~~~
>   tools/include/linux/kernel.h:47:45: note: expanded from macro 'clamp'
>      47 | #define clamp(val, lo, hi)      min((typeof(val))max(val, lo), hi)
>         |                                                  ^~~~~~~~~~~~
>   tools/include/linux/kernel.h:33:17: note: expanded from macro 'max'
>      33 |         (void) (&_max1 == &_max2);              \
>         |                 ~~~~~~ ^  ~~~~~~
>   tools/include/linux/kernel.h:39:9: note: expanded from macro 'min'
>      39 |         typeof(x) _min1 = (x);                  \
>         |                ^
> 
> [...]

Applied to fixes, thanks!

[1/1] KVM: selftests: Track width of arm64's timer counter as "int", not "uint64_t"
      commit 34f46fecfe96b404ef14e97b8e59cde693276f28.

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.