[merged mm-stable] s390-unwind-disable-kmsan-checks.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
Subject: s390/unwind: disable KMSAN checks
has been removed from the -mm tree. Its filename was
s390-unwind-disable-kmsan-checks.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Ilya Leoshkevich <i...@linux.ibm.com>
Subject: s390/unwind: disable KMSAN checks
Date: Fri, 21 Jun 2024 13:35:20 +0200

The unwind code can read uninitialized frames. Furthermore, even in the
good case, KMSAN does not emit shadow for backchains. Therefore disable
it for the unwinding functions.

Link: https://lkml.kernel.org/r/20240621113706...@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <i...@linux.ibm.com>
Reviewed-by: Alexander Potapenko <gli...@google.com>
Acked-by: Heiko Carstens <h...@linux.ibm.com>
Cc: Alexander Gordeev <agor...@linux.ibm.com>
Cc: Christian Borntraeger <bornt...@linux.ibm.com>
Cc: Christoph Lameter <c...@linux.com>
Cc: David Rientjes <rien...@google.com>
Cc: Dmitry Vyukov <dvy...@google.com>
Cc: Hyeonggon Yoo <42.h...@gmail.com>
Cc: Joonsoo Kim <iamjoon...@lge.com>
Cc: <kasa...@googlegroups.com>
Cc: Marco Elver <el...@google.com>
Cc: Mark Rutland <mark.r...@arm.com>
Cc: Masami Hiramatsu (Google) <mhir...@kernel.org>
Cc: Pekka Enberg <pen...@kernel.org>
Cc: Roman Gushchin <roman.g...@linux.dev>
Cc: Steven Rostedt (Google) <ros...@goodmis.org>
Cc: Sven Schnelle <sv...@linux.ibm.com>
Cc: Vasily Gorbik <g...@linux.ibm.com>
Cc: Vlastimil Babka <vba...@suse.cz>
Signed-off-by: Andrew Morton <ak...@linux-foundation.org>
---

arch/s390/kernel/unwind_bc.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/arch/s390/kernel/unwind_bc.c~s390-unwind-disable-kmsan-checks
+++ a/arch/s390/kernel/unwind_bc.c
@@ -49,6 +49,8 @@ static inline bool is_final_pt_regs(stru
READ_ONCE_NOCHECK(regs->psw.mask) & PSW_MASK_PSTATE;
}

+/* Avoid KMSAN false positives from touching uninitialized frames. */
+__no_kmsan_checks
bool unwind_next_frame(struct unwind_state *state)
{
struct stack_info *info = &state->stack_info;
@@ -118,6 +120,8 @@ out_stop:
}
EXPORT_SYMBOL_GPL(unwind_next_frame);

+/* Avoid KMSAN false positives from touching uninitialized frames. */
+__no_kmsan_checks
void __unwind_start(struct unwind_state *state, struct task_struct *task,
struct pt_regs *regs, unsigned long first_frame)
{
_

Patches currently in -mm which might be from i...@linux.ibm.com are