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Mon, 05 Feb 2024 16:13:50 -0800 (PST) From: Yoann Congal To: linux-fsdevel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, x86@kernel.org Cc: =?utf-8?q?Andr=C3=A9_Almeida?= , Borislav Petkov , Darren Hart , Dave Hansen , Davidlohr Bueso , Geert Uytterhoeven , Greg Kroah-Hartman , "H . Peter Anvin" , Ingo Molnar , Jiri Slaby , John Ogness , Josh Triplett , Masahiro Yamada , Matthew Wilcox , Peter Zijlstra , Petr Mladek , Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , Willem de Bruijn , Yoann Congal , Vegard Nossum Subject: [PATCH v4 1/3] printk: Fix LOG_CPU_MAX_BUF_SHIFT when BASE_SMALL is enabled Date: Tue, 6 Feb 2024 01:13:31 +0100 Message-Id: <20240206001333.1710070-2-yoann.congal@smile.fr> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240206001333.1710070-1-yoann.congal@smile.fr> References: <20240206001333.1710070-1-yoann.congal@smile.fr> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790106403688401674 X-GMAIL-MSGID: 1790106403688401674 LOG_CPU_MAX_BUF_SHIFT default value depends on BASE_SMALL: config LOG_CPU_MAX_BUF_SHIFT default 12 if !BASE_SMALL default 0 if BASE_SMALL But, BASE_SMALL is a config of type int and "!BASE_SMALL" is always evaluated to true whatever is the value of BASE_SMALL. This patch fixes this by using the correct conditional operator for int type : BASE_SMALL != 0. Note: This changes CONFIG_LOG_CPU_MAX_BUF_SHIFT=12 to CONFIG_LOG_CPU_MAX_BUF_SHIFT=0 for BASE_SMALL defconfigs, but that will not be a big impact due to this code in kernel/printk/printk.c: /* by default this will only continue through for large > 64 CPUs */ if (cpu_extra <= __LOG_BUF_LEN / 2) return; Systems using CONFIG_BASE_SMALL and having 64+ CPUs should be quite rare. John Ogness (printk reviewer) wrote: > For printk this will mean that BASE_SMALL systems were probably > previously allocating/using the dynamic ringbuffer and now they will > just continue to use the static ringbuffer. Which is fine and saves > memory (as it should). Petr Mladek (printk maintainer) wrote: > More precisely, it allocated the buffer dynamically when the sum > of per-CPU-extra space exceeded half of the default static ring > buffer. This happened for systems with more than 64 CPUs with > the default config values. Signed-off-by: Yoann Congal Reported-by: Geert Uytterhoeven Closes: https://lore.kernel.org/all/CAMuHMdWm6u1wX7efZQf=2XUAHascps76YQac6rdnQGhc8nop_Q@mail.gmail.com/ Reported-by: Vegard Nossum Closes: https://lore.kernel.org/all/f6856be8-54b7-0fa0-1d17-39632bf29ada@oracle.com/ Fixes: 4e244c10eab3 ("kconfig: remove unneeded symbol_empty variable") Reviewed-by: Petr Mladek Reviewed-by: Masahiro Yamada --- v3->v4: * Fix BASE_SMALL usage instead of switching to BASE_FULL because BASE_FULL will be removed in the next patches of this series. --- init/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index deda3d14135bb..d50ebd2a2ce42 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -734,8 +734,8 @@ config LOG_CPU_MAX_BUF_SHIFT int "CPU kernel log buffer size contribution (13 => 8 KB, 17 => 128KB)" depends on SMP range 0 21 - default 12 if !BASE_SMALL - default 0 if BASE_SMALL + default 0 if BASE_SMALL != 0 + default 12 depends on PRINTK help This option allows to increase the default ring buffer size