[PATCH RT 0/2] Linux v5.10.194-rt95-rc1

[PATCH RT 0/2] Linux v5.10.194-rt95-rc1

[Luis Claudio R. Goncalves]

Dear RT Folks,

This is the RT stable review cycle of patch 5.10.194-rt95-rc1.

Please scream at me if I messed something up. Please test the patches
too.

The -rc release will be uploaded to kernel.org and will be deleted
when the final release is out. This is just a review release (or
release candidate).

The pre-releases will not be pushed to the git repository, only the
final release is.

If all goes well, this patch will be converted to the next main
release on 2023-09-21.

To build 5.10.194-rt95-rc1 directly, the following patches should be applied:

  https://www.kernel.org/pub/linux/kernel/v5.x/linux-5.10.tar.xz

  https://www.kernel.org/pub/linux/kernel/v5.x/patch-5.10.194.xz

  https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patch-5.10.194-rt95-rc1.patch.xz

Signing key fingerprint:

  9354 0649 9972 8D31 D464  D140 F394 A423 F8E6 7C26

All keys used for the above files and repositories can be found on the
following git repository:

   git://git.kernel.org/pub/scm/docs/kernel/pgpkeys.git

Enjoy!
Luis

Changes from v5.10.194-rt94:


Luis Claudio R. Goncalves (1):
  Linux 5.10.194-rt95-rc1

Wang Yong (1):
  arm64: signal: Use ARCH_RT_DELAYS_SIGNAL_SEND

 arch/arm64/include/asm/signal.h | 12 ++++++++++++
 arch/arm64/kernel/signal.c      |  9 +++++++++
 localversion-rt                 |  2 +-
 3 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/include/asm/signal.h

-- 
2.41.0

[PATCH RT 1/2] arm64: signal: Use ARCH_RT_DELAYS_SIGNAL_SEND

[Luis Claudio R. Goncalves]

From: Wang Yong <wang.yong12@zte.com.cn>

v5.10.194-rt95-rc1 stable review patch.
If anyone has any objections, please let me know.

-----------


The ltp test prompts the following bug information under the 5.10 kernel:
BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:969
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 796, name: cat
Preemption disabled at:
[<ffffffe40f433980>] do_debug_exception+0x60/0x180
CPU: 3 PID: 796 Comm: cat Not tainted 5.10.59-rt52-KERNEL_VERSION #38
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x0/0x198
 show_stack+0x20/0x30
 dump_stack+0xf0/0x13c
 ___might_sleep+0x140/0x178
 rt_spin_lock+0x30/0x90
 force_sig_info_to_task+0x30/0xe0
 force_sig_fault_to_task+0x54/0x78
 force_sig_fault+0x1c/0x28
 arm64_force_sig_fault+0x48/0x78
 send_user_sigtrap+0x4c/0x80
 brk_handler+0x3c/0x68
 do_debug_exception+0xac/0x180
 el0_dbg+0x34/0x58
 el0_sync_handler+0x50/0xb8
 el0_sync+0x180/0x1c0

It has been fixed by
0c34700de5e7 ("arm64: signal: Use ARCH_RT_DELAYS_SIGNAL_SEND.") in
higher versions of the kernel. This patch needs to be compatible with 5.10.
5.10 kernel does not have signal.h file, so adding signal.h file to
define ARCH_RT_DELAYS_SIGNAL_SEND.

Link: https://lore.kernel.org/r/202309121514283793475@zte.com.cn
Signed-off-by: Wang Yong <wang.yong12@zte.com.cn>
Cc: Xuexin Jiang <jiang.xuexin@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: Xiaokai Ran <ran.xiaokai@zte.com.cn>
Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
---
 arch/arm64/include/asm/signal.h | 12 ++++++++++++
 arch/arm64/kernel/signal.c      |  9 +++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 arch/arm64/include/asm/signal.h

diff --git a/arch/arm64/include/asm/signal.h b/arch/arm64/include/asm/signal.h
new file mode 100644
index 000000000000..0fb418cf4c17
--- /dev/null
+++ b/arch/arm64/include/asm/signal.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ARM64_ASM_SIGNAL_H
+#define __ARM64_ASM_SIGNAL_H
+
+#include <uapi/asm/signal.h>
+#include <uapi/asm/siginfo.h>
+
+#if defined(CONFIG_PREEMPT_RT)
+#define ARCH_RT_DELAYS_SIGNAL_SEND
+#endif
+
+#endif
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index 94eed0dc3afc..5b08f55ec85d 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -929,6 +929,15 @@ asmlinkage void do_notify_resume(struct pt_regs *regs,
 		} else {
 			local_daif_restore(DAIF_PROCCTX);
 
+#ifdef ARCH_RT_DELAYS_SIGNAL_SEND
+			if (unlikely(current->forced_info.si_signo)) {
+				struct task_struct *t = current;
+
+				force_sig_info(&t->forced_info);
+				t->forced_info.si_signo = 0;
+			}
+#endif
+
 			if (thread_flags & _TIF_UPROBE)
 				uprobe_notify_resume(regs);
 
-- 
2.41.0

[PATCH RT 2/2] Linux 5.10.194-rt95-rc1

[Luis Claudio R. Goncalves]

v5.10.194-rt95-rc1 stable review patch.
If anyone has any objections, please let me know.

-----------


Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
---
 localversion-rt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/localversion-rt b/localversion-rt
index 8d02a9bac500..fe529ae51f64 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt94
+-rt95-rc1
-- 
2.41.0