linux-kernel - Re: [RESEND PATCH v3] x86: Clear feature bits disabled at compile-time

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Message-ID: <2025072440-prepaid-resilient-9603@gregkh>
Date: Thu, 24 Jul 2025 13:34:44 +0200
From: Greg KH <greg@...ah.com>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>,
	Kyung Min Park <kyung.min.park@...el.com>, xin3.li@...el.com,
	maciej.wieczor-retman@...el.com,
	Farrah Chen <farrah.chen@...el.com>, stable@...r.kernel.org,
	Borislav Petkov <bp@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v3] x86: Clear feature bits disabled at
 compile-time

Your reply-to is messed up :(

On Thu, Jul 24, 2025 at 12:45:35PM +0200, Maciej Wieczor-Retman wrote:
> If some config options are disabled during compile time, they still are
> enumerated in macros that use the x86_capability bitmask - cpu_has() or
> this_cpu_has().
> 
> The features are also visible in /proc/cpuinfo even though they are not
> enabled - which is contrary to what the documentation states about the
> file. Examples of such feature flags are lam, fred, sgx, ibrs_enhanced,
> split_lock_detect, user_shstk, avx_vnni and enqcmd.
> 
> Add a DISABLED_MASK_INITIALIZER macro that creates an initializer list
> filled with DISABLED_MASKx bitmasks.
> 
> Initialize the cpu_caps_cleared array with the autogenerated disabled
> bitmask.
> 
> Fixes: ea4e3bef4c94 ("Documentation/x86: Add documentation for /proc/cpuinfo feature flags")
> Reported-by: Farrah Chen <farrah.chen@...el.com>
> Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
> Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
> Cc: <stable@...r.kernel.org>
> ---
> Resend:
> - Fix macro name to match with the patch message.

That's a v4, not a RESEND.

Doesn't Intel have a "Here is how to submit a patch to the kernel"
training program you have to go through?

confused,

greg k-h