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authorKees Cook <kees+treewide@kernel.org>2026-09-02 15:31:14 -0700
committerKees Cook <kees@kernel.org>2026-09-04 21:37:00 -0700
commit3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d (patch)
treec65086f9bdcd48c6360fb7cb4598bca084da1f32 /fs/ext4/Kconfig
downloadlinux-stable-3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d.tar.gz
linux-stable-3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d.zip
treewide: refresh kmalloc_obj() conversionsgrafted
This is another run of the Coccinelle script for converting kmalloc() family of allocations to kmalloc_obj() via the existing rules in scripts/coccinelle/api/kmalloc_objs.cocci This catches both the set of kmalloc() uses added since the first kmalloc_obj() conversions in v7.0 and adds a large group missed in the first pass due to Coccinelle not interacting well with the cleanup.h scoped_...() family of macros[1]. I worked around this with spatch's "--macro-file" argument to a file with all the scoped_...() macros mapped to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control flow indicator I could find. Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc, riscv, and s390 with no new warnings. Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1] Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2] Signed-off-by: Kees Cook <kees+treewide@kernel.org>
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diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
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+# SPDX-License-Identifier: GPL-2.0-only
+config EXT4_FS
+ tristate "The Extended 4 (ext4) filesystem"
+ select BUFFER_HEAD
+ select JBD2
+ select CRC16
+ select CRC32
+ select FS_IOMAP
+ select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
+ help
+ This is the next generation of the ext3 filesystem.
+
+ Unlike the change from ext2 filesystem to ext3 filesystem,
+ the on-disk format of ext4 is not forwards compatible with
+ ext3; it is based on extent maps and it supports 48-bit
+ physical block numbers. The ext4 filesystem also supports delayed
+ allocation, persistent preallocation, high resolution time stamps,
+ and a number of other features to improve performance and speed
+ up fsck time. For more information, please see the web pages at
+ http://ext4.wiki.kernel.org.
+
+ The ext4 filesystem supports mounting an ext3 filesystem; while there
+ are some performance gains from the delayed allocation and inode
+ table readahead, the best performance gains require enabling ext4
+ features in the filesystem using tune2fs, or formatting a new
+ filesystem as an ext4 filesystem initially. Without explicit enabling
+ of ext4 features, the on disk filesystem format stays fully backward
+ compatible.
+
+ To compile this file system support as a module, choose M here. The
+ module will be called ext4.
+
+ If unsure, say N.
+
+config EXT4_USE_FOR_EXT2
+ bool "Use ext4 for ext2 file systems"
+ depends on EXT4_FS
+ depends on EXT2_FS=n
+ default y
+ help
+ Allow the ext4 file system driver code to be used for ext2
+ file system mounts. This allows users to reduce their
+ compiled kernel size by using one file system driver for
+ ext2, ext3, and ext4 file systems.
+
+config EXT4_FS_POSIX_ACL
+ bool "Ext4 POSIX Access Control Lists"
+ depends on EXT4_FS
+ select FS_POSIX_ACL
+ help
+ POSIX Access Control Lists (ACLs) support permissions for users and
+ groups beyond the owner/group/world scheme.
+
+ If you don't know what Access Control Lists are, say N
+
+config EXT4_FS_SECURITY
+ bool "Ext4 Security Labels"
+ depends on EXT4_FS
+ help
+ Security labels support alternative access control models
+ implemented by security modules like SELinux. This option
+ enables an extended attribute handler for file security
+ labels in the ext4 filesystem.
+
+ If you are not using a security module that requires using
+ extended attributes for file security labels, say N.
+
+config EXT4_DEBUG
+ bool "Ext4 debugging support"
+ depends on EXT4_FS
+ help
+ Enables run-time debugging support for the ext4 filesystem.
+
+ If you select Y here, then you will be able to turn on debugging
+ using dynamic debug control for mb_debug() / ext_debug() msgs.
+
+config EXT4_KUNIT_TESTS
+ tristate "KUnit tests for ext4" if !KUNIT_ALL_TESTS
+ depends on EXT4_FS && KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds the ext4 KUnit tests.
+
+ KUnit tests run during boot and output the results to the debug log
+ in TAP format (https://testanything.org/). Only useful for kernel devs
+ running KUnit test harness and are not for inclusion into a production
+ build.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.