The patch titled
Subject: mm/kmemleak.c: use address-of operator on section symbols
has been removed from the -mm tree. Its filename was
mm-kmemleak-use-address-of-operator-on-section-symbols.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Nathan Chancellor <natechancellor@xxxxxxxxx>
Subject: mm/kmemleak.c: use address-of operator on section symbols
Clang warns:
../mm/kmemleak.c:1955:28: warning: array comparison always evaluates to a constant [-Wtautological-compare]
if (__start_ro_after_init < _sdata || __end_ro_after_init > _edata)
^
../mm/kmemleak.c:1955:60: warning: array comparison always evaluates to a constant [-Wtautological-compare]
if (__start_ro_after_init < _sdata || __end_ro_after_init > _edata)
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).
Link: https://github.com/ClangBuiltLinux/linux/issues/895
Link: http://lkml.kernel.org/r/20200220051551.44000-1-natechancellor@xxxxxxxxx
Suggested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kmemleak.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/kmemleak.c~mm-kmemleak-use-address-of-operator-on-section-symbols
+++ a/mm/kmemleak.c
@@ -1947,7 +1947,7 @@ void __init kmemleak_init(void)
create_object((unsigned long)__bss_start, __bss_stop - __bss_start,
KMEMLEAK_GREY, GFP_ATOMIC);
/* only register .data..ro_after_init if not within .data */
- if (__start_ro_after_init < _sdata || __end_ro_after_init > _edata)
+ if (&__start_ro_after_init < &_sdata || &__end_ro_after_init > &_edata)
create_object((unsigned long)__start_ro_after_init,
__end_ro_after_init - __start_ro_after_init,
KMEMLEAK_GREY, GFP_ATOMIC);
_
Patches currently in -mm which might be from natechancellor@xxxxxxxxx are
kernel-extable-use-address-of-operator-on-section-symbols.patch
dynamic_debug-use-address-of-operator-on-section-symbols.patch
