6.1-stable patches

added patches:
	compiler-attributes-add-__uninitialized-macro.patch

diff --git a/queue-6.1/compiler-attributes-add-__uninitialized-macro.patch b/queue-6.1/compiler-attributes-add-__uninitialized-macro.patch
new file mode 100644 (file)
index 0000000..279fd1e
--- /dev/null
+++ b/queue-6.1/compiler-attributes-add-__uninitialized-macro.patch
@@ -0,0 +1,50 @@
+From fd7eea27a3aed79b63b1726c00bde0d50cf207e2 Mon Sep 17 00:00:00 2001
+From: Heiko Carstens <hca@linux.ibm.com>
+Date: Mon, 5 Feb 2024 16:48:43 +0100
+Subject: Compiler Attributes: Add __uninitialized macro
+
+From: Heiko Carstens <hca@linux.ibm.com>
+
+commit fd7eea27a3aed79b63b1726c00bde0d50cf207e2 upstream.
+
+With INIT_STACK_ALL_PATTERN or INIT_STACK_ALL_ZERO enabled the kernel will
+be compiled with -ftrivial-auto-var-init=<...> which causes initialization
+of stack variables at function entry time.
+
+In order to avoid the performance impact that comes with this users can use
+the "uninitialized" attribute to prevent such initialization.
+
+Therefore provide the __uninitialized macro which can be used for cases
+where INIT_STACK_ALL_PATTERN or INIT_STACK_ALL_ZERO is enabled, but only
+selected variables should not be initialized.
+
+Acked-by: Kees Cook <keescook@chromium.org>
+Reviewed-by: Nathan Chancellor <nathan@kernel.org>
+Link: https://lore.kernel.org/r/20240205154844.3757121-2-hca@linux.ibm.com
+Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ include/linux/compiler_attributes.h |   12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+--- a/include/linux/compiler_attributes.h
++++ b/include/linux/compiler_attributes.h
+@@ -322,6 +322,18 @@
+ #define __section(section)              __attribute__((__section__(section)))
+ 
+ /*
++ * Optional: only supported since gcc >= 12
++ *
++ *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-uninitialized-variable-attribute
++ * clang: https://clang.llvm.org/docs/AttributeReference.html#uninitialized
++ */
++#if __has_attribute(__uninitialized__)
++# define __uninitialized              __attribute__((__uninitialized__))
++#else
++# define __uninitialized
++#endif
++
++/*
+  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-unused-function-attribute
+  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-unused-type-attribute
+  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-unused-variable-attribute

diff --git a/queue-6.1/series b/queue-6.1/series
index a0b4042fcb397155c0675cf61da920f534429e2b..8af1e17845d44144c0424aa8194da3faebff789d 100644 (file)
--- a/queue-6.1/series
+++ b/queue-6.1/series
@@ -1,3 +1,4 @@
+compiler-attributes-add-__uninitialized-macro.patch
 mm-prevent-derefencing-null-ptr-in-pfn_section_valid.patch
 cachefiles-propagate-errors-from-vfs_getxattr-to-avo.patch
 cachefiles-narrow-the-scope-of-triggering-epollin-ev.patch