From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: KP Singh <kpsingh@kernel.org>
Cc: linux-security-module@vger.kernel.org, bpf@vger.kernel.org,
ast@kernel.org, paul@paul-moore.com, casey@schaufler-ca.com,
andrii@kernel.org, keescook@chromium.org, daniel@iogearbox.net,
renauld@google.com, revest@chromium.org, song@kernel.org,
linux@roeck-us.net, Kui-Feng Lee <sinquersw@gmail.com>,
John Johansen <john.johansen@canonical.com>
Subject: Re: [PATCH v15 3/4] lsm: count the LSMs enabled at compile time
Date: Wed, 26 Nov 2025 18:14:16 +0100 [thread overview]
Message-ID: <aSc1aAdOeSuuoKTH@black.igk.intel.com> (raw)
In-Reply-To: <20240816154307.3031838-4-kpsingh@kernel.org>
On Fri, Aug 16, 2024 at 05:43:06PM +0200, KP Singh wrote:
> These macros are a clever trick to determine a count of the number of
> LSMs that are enabled in the config to ascertain the maximum number of
> static calls that need to be configured per LSM hook.
>
> Without this one would need to generate static calls for the total
> number of LSMs in the kernel (even if they are not compiled) times the
> number of LSM hooks which ends up being quite wasteful.
...
> -/* This counts to 12. Any more, it will return 13th argument. */
> -#define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n
> -#define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
> +/* This counts to 15. Any more, it will return 16th argument. */
> +#define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _n, X...) _n
> +#define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
You forgot to update _12 in the upper comment.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2025-11-26 17:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-16 15:43 [PATCH v15 0/4] Reduce overhead of LSMs with static calls KP Singh
2024-08-16 15:43 ` [PATCH v15 1/4] init/main.c: Initialize early LSMs after arch code, static keys and calls KP Singh
2024-08-16 15:43 ` [PATCH v15 2/4] kernel: Add helper macros for loop unrolling KP Singh
2024-08-16 15:43 ` [PATCH v15 3/4] lsm: count the LSMs enabled at compile time KP Singh
2024-08-20 4:39 ` Paul Moore
2024-08-22 16:27 ` Paul Moore
2025-11-26 17:14 ` Andy Shevchenko [this message]
2025-11-26 19:02 ` Paul Moore
2025-11-26 19:44 ` Andy Shevchenko
2024-08-16 15:43 ` [PATCH v15 4/4] lsm: replace indirect LSM hook calls with static calls KP Singh
2024-08-16 21:30 ` [PATCH v15 0/4] Reduce overhead of LSMs " Guenter Roeck
2024-08-20 4:33 ` Paul Moore
2024-08-18 4:37 ` Tetsuo Handa
2024-08-20 5:17 ` Paul Moore
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