From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- Documentation/sphinx-static/custom.css | 203 +++++++++++++++++++++++ Documentation/sphinx-static/theme_overrides.css | 120 ++++++++++++++ Documentation/sphinx-static/theme_rtd_colors.css | 37 +++++ 3 files changed, 360 insertions(+) create mode 100644 Documentation/sphinx-static/custom.css create mode 100644 Documentation/sphinx-static/theme_overrides.css create mode 100644 Documentation/sphinx-static/theme_rtd_colors.css (limited to 'Documentation/sphinx-static') diff --git a/Documentation/sphinx-static/custom.css b/Documentation/sphinx-static/custom.css new file mode 100644 index 000000000..6c03dca44 --- /dev/null +++ b/Documentation/sphinx-static/custom.css @@ -0,0 +1,203 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * CSS tweaks for the Alabaster theme + */ + +div.body { max-width: 120em; 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+ font-size: 100%; +} + +h1, h2, .rst-content .toctree-wrapper p.caption, h3, h4, h5, h6, legend { + font-family: sans-serif; +} + +div[class^="highlight"] pre { + font-family: monospace; + font-size: 100%; +} + +.wy-menu-vertical { + font-family: sans-serif; +} + +.c { + font-style: normal; +} + +p { + font-size: 100%; +} + +/* Interim: Code-blocks with line nos - lines and line numbers don't line up. + * see: https://github.com/rtfd/sphinx_rtd_theme/issues/419 + */ + +div[class^="highlight"] pre { + line-height: normal; +} +.rst-content .highlight > pre { + line-height: normal; +} + +/* Keep fields from being strangely far apart due to inheirited table CSS. */ +.rst-content table.field-list th.field-name { + padding-top: 1px; + padding-bottom: 1px; +} +.rst-content table.field-list td.field-body { + padding-top: 1px; + padding-bottom: 1px; +} + +@media screen { + + /* content column + * + * RTD theme's default is 800px as max width for the content, but we have + * tables with tons of columns, which need the full width of the view-port. + */ + + .wy-nav-content{max-width: none; } + + /* table: + * + * - Sequences of whitespace should collapse into a single whitespace. + * - make the overflow auto (scrollbar if needed) + * - align caption "left" ("center" is unsuitable on vast tables) + */ + + .wy-table-responsive table td { white-space: normal; } + .wy-table-responsive { overflow: auto; } + .rst-content table.docutils caption { text-align: left; font-size: 100%; } + + /* captions: + * + * - captions should have 100% (not 85%) font size + * - hide the permalink symbol as long as link is not hovered + */ + + caption, .wy-table caption, .rst-content table.field-list caption { + font-size: 100%; + } + caption a.headerlink { opacity: 0; } + caption a.headerlink:hover { opacity: 1; } + + /* Menu selection and keystrokes */ + + span.menuselection { + font-family: "Courier New", Courier, monospace + } + + code.kbd, code.kbd span { + font-weight: bold; + font-family: "Courier New", Courier, monospace + } + + /* fix bottom margin of lists items */ + + .rst-content .section ul li:last-child, .rst-content .section ul li p:last-child { + margin-bottom: 12px; + } + + /* inline literal: drop the borderbox, padding and red color */ + + code, .rst-content tt, .rst-content code { + color: inherit; + border: none; + padding: unset; + background: inherit; + font-size: 85%; + } + + .rst-content tt.literal,.rst-content tt.literal,.rst-content code.literal { + color: inherit; + } +} diff --git a/Documentation/sphinx-static/theme_rtd_colors.css b/Documentation/sphinx-static/theme_rtd_colors.css new file mode 100644 index 000000000..55b6e1c36 --- /dev/null +++ b/Documentation/sphinx-static/theme_rtd_colors.css @@ -0,0 +1,37 @@ +/* -*- coding: utf-8; mode: css -*- + * + * Sphinx HTML theme customization: color settings for RTD (non-dark) theme + * + */ + +/* Improve contrast and increase size for easier reading. */ + +body { + color: black; +} + +.wy-menu-vertical li.current a { + color: #505050; +} + +.wy-menu-vertical li.on a, .wy-menu-vertical li.current > a { + color: #303030; +} + +div[class^="highlight"] pre { + color: black; +} + +@media screen { + + /* Menu selection and keystrokes */ + + span.menuselection { + color: blue; + } + + code.kbd, code.kbd span { + color: white; + background-color: darkblue; + } +} -- cgit v1.3.1