This is a note to let you know that I've just added the patch titled
kernel/extable.c: use address-of operator on section symbols
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kernel-extable.c-use-address-of-operator-on-section-symbols.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 63174f61dfaef58dc0e813eaf6602636794f8942 Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <natechancellor@xxxxxxxxx>
Date: Mon, 6 Apr 2020 20:09:27 -0700
Subject: kernel/extable.c: use address-of operator on section symbols
From: Nathan Chancellor <natechancellor@xxxxxxxxx>
commit 63174f61dfaef58dc0e813eaf6602636794f8942 upstream.
Clang warns:
../kernel/extable.c:37:52: warning: array comparison always evaluates to
a constant [-Wtautological-compare]
if (main_extable_sort_needed && __stop___ex_table > __start___ex_table) {
^
1 warning generated.
These are not true arrays, they are linker defined symbols, which are just
addresses. Using the address of operator silences the warning and does
not change the resulting assembly with either clang/ld.lld or gcc/ld
(tested with diff + objdump -Dr).
Suggested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Link: https://github.com/ClangBuiltLinux/linux/issues/892
Link: http://lkml.kernel.org/r/20200219202036.45702-1-natechancellor@xxxxxxxxx
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/extable.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -34,7 +34,8 @@ u32 __initdata __visible main_extable_so
/* Sort the kernel's built-in exception table */
void __init sort_main_extable(void)
{
- if (main_extable_sort_needed && __stop___ex_table > __start___ex_table) {
+ if (main_extable_sort_needed &&
+ &__stop___ex_table > &__start___ex_table) {
pr_notice("Sorting __ex_table...\n");
sort_extable(__start___ex_table, __stop___ex_table);
}
Patches currently in stable-queue which might be from natechancellor@xxxxxxxxx are
queue-5.4/kernel-extable.c-use-address-of-operator-on-section-symbols.patch
queue-5.4/lib-dynamic_debug.c-use-address-of-operator-on-section-symbols.patch
