linux-kernel - Re: [PATCH 5.10 88/91] arm64/kexec: Test page size support with new TGRAN range values

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Message-ID: <Y+zFA1JuAcjhAogm@kroah.com>
Date:   Wed, 15 Feb 2023 12:41:55 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     heyuqiang <heyuqiang1@...wei.com>
Cc:     anshuman.khandual@....com, catalin.marinas@....com,
        james.morse@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        stable@...r.kernel.org, will@...nel.org, yuzenghui@...wei.com,
        nixiaoming@...wei.com, lijiahuan5@...wei.com
Subject: Re: [PATCH 5.10 88/91] arm64/kexec: Test page size support with new
 TGRAN range values

On Wed, Feb 15, 2023 at 06:58:13PM +0800, heyuqiang wrote:
> There is an error
> 
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
> master
> head: c911f03f8d444e623724fddd82b07a7e1af42338
> commit: d5924531dd8ad012ad13eb4d6a5e120c3dadfc05 arm64/kexec: Test page size
> support with new TGRAN range values
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d5924531dd8ad012ad13eb4d6a5e120c3dadfc05
> 
> When I compile the ko file, I add [-Werror=type-limits] compilation options,
> an error is reported during compilation.

Why add that option?  Is that a valid option for the 5.10.y kernel?  Is
this something new?

And note, you are responding to a commit from last November, with no
context at all.  Is this an issue in Linus's tree too?

> 
> The log is as follows:
> 
> ./arch/arm64/include/asm/cpufeature.h: In function
> ‘system_supports_4kb_granule’:
> ./arch/arm64/include/asm/cpufeature.h:653:14: error:
> comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
> return (val >= ID_AA64MMFR0_TGRAN4_SUPPORTED_MIN) &&
> ^~
> ./arch/arm64/include/asm/cpufeature.h: In function
> ‘system_supports_64kb_granule’:
> ./arch/arm64/include/asm/cpufeature.h:666:14: error:
> comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
> return (val >= ID_AA64MMFR0_TGRAN64_SUPPORTED_MIN) &&
> ^~
> 
> "val" variable type is "u32"
> "#define ID_AA64MMFR0_TGRAN4_SUPPORTED_MIN 0x0"
> "#define ID_AA64MMFR0_TGRAN64_SUPPORTED_MIN 0x0"
> comparison of val >= 0 is always true.
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: heyuqiang <heyuqiang1@...wei.com>

Please provide a valid fix for this if you wish for it to be resolved.

thanks,

greg k-h