The patch titled
Subject: scripts/gdb: fix aarch64 userspace detection in get_current_task
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
scripts-gdb-fix-aarch64-userspace-detection-in-get_current_task.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-gdb-fix-aarch64-userspace-detection-in-get_current_task.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Subject: scripts/gdb: fix aarch64 userspace detection in get_current_task
Date: Fri, 10 Jan 2025 11:36:33 +0100
At least recent gdb releases (seen with 14.2) return SP_EL0 as signed long
which lets the right-shift always return 0.
Link: https://lkml.kernel.org/r/dcd2fabc-9131-4b48-8419-6444e2d67454@xxxxxxxxxxx
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Cc: Barry Song <baohua@xxxxxxxxxx>
Cc: Kieran Bingham <kbingham@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/cpus.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/scripts/gdb/linux/cpus.py~scripts-gdb-fix-aarch64-userspace-detection-in-get_current_task
+++ a/scripts/gdb/linux/cpus.py
@@ -167,7 +167,7 @@ def get_current_task(cpu):
var_ptr = gdb.parse_and_eval("&pcpu_hot.current_task")
return per_cpu(var_ptr, cpu).dereference()
elif utils.is_target_arch("aarch64"):
- current_task_addr = gdb.parse_and_eval("$SP_EL0")
+ current_task_addr = gdb.parse_and_eval("(unsigned long)$SP_EL0")
if (current_task_addr >> 63) != 0:
current_task = current_task_addr.cast(task_ptr_type)
return current_task.dereference()
_
Patches currently in -mm which might be from jan.kiszka@xxxxxxxxxxx are
scripts-gdb-fix-aarch64-userspace-detection-in-get_current_task.patch
