+ ubsan-no-need-to-unset-panic_on_warn-in-ubsan_epilogue.patch added to -mm tree

+ ubsan-no-need-to-unset-panic_on_warn-in-ubsan_epilogue.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: ubsan: no need to unset panic_on_warn in ubsan_epilogue()
has been added to the -mm tree.  Its filename is
     ubsan-no-need-to-unset-panic_on_warn-in-ubsan_epilogue.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/ubsan-no-need-to-unset-panic_on_warn-in-ubsan_epilogue.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/ubsan-no-need-to-unset-panic_on_warn-in-ubsan_epilogue.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Tiezhu Yang <yangtiezhu@loongson.cn>
Subject: ubsan: no need to unset panic_on_warn in ubsan_epilogue()

panic_on_warn is unset inside panic(), so no need to unset it before
calling panic() in ubsan_epilogue().

Link: https://lkml.kernel.org/r/1644324666-15947-5-git-send-email-yangtiezhu@loongson.cn
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Xuefeng Li <lixuefeng@loongson.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/ubsan.c |   10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

--- a/lib/ubsan.c~ubsan-no-need-to-unset-panic_on_warn-in-ubsan_epilogue
+++ a/lib/ubsan.c
@@ -154,16 +154,8 @@ static void ubsan_epilogue(void)
 
 	current->in_ubsan--;
 
-	if (panic_on_warn) {
-		/*
-		 * This thread may hit another WARN() in the panic path.
-		 * Resetting this prevents additional WARN() from panicking the
-		 * system on this thread.  Other threads are blocked by the
-		 * panic_mutex in panic().
-		 */
-		panic_on_warn = 0;
+	if (panic_on_warn)
 		panic("panic_on_warn set ...\n");
-	}
 }
 
 void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
_

Patches currently in -mm which might be from yangtiezhu@loongson.cn are

docs-kdump-update-description-about-sysfs-file-system-support.patch
docs-kdump-add-scp-example-to-write-out-the-dump-file.patch
panic-unset-panic_on_warn-inside-panic.patch
ubsan-no-need-to-unset-panic_on_warn-in-ubsan_epilogue.patch
kasan-no-need-to-unset-panic_on_warn-in-end_report.patch