linux-kernel - [tip: objtool/core] sched: Fix KCSAN noinstr violation

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Date:   Fri, 14 Apr 2023 14:47:57 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] sched: Fix KCSAN noinstr violation

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     e0b081d17a9f4e5c0cbb0e5fbeb1abe3de0f7e4e
Gitweb:        https://git.kernel.org/tip/e0b081d17a9f4e5c0cbb0e5fbeb1abe3de0f7e4e
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Wed, 12 Apr 2023 10:24:07 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 14 Apr 2023 16:08:26 +02:00

sched: Fix KCSAN noinstr violation

With KCSAN enabled, end_of_stack() can get out-of-lined.  Force it
inline.

Fixes the following warnings:

  vmlinux.o: warning: objtool: check_stackleak_irqoff+0x2b: call to end_of_stack() leaves .noinstr.text section

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/cc1b4d73d3a428a00d206242a68fdf99a934ca7b.1681320026.git.jpoimboe@kernel.org
---
 include/linux/sched/task_stack.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/sched/task_stack.h b/include/linux/sched/task_stack.h
index 5e799a4..f158b02 100644
--- a/include/linux/sched/task_stack.h
+++ b/include/linux/sched/task_stack.h
@@ -23,7 +23,7 @@ static __always_inline void *task_stack_page(const struct task_struct *task)
 
 #define setup_thread_stack(new,old)	do { } while(0)
 
-static inline unsigned long *end_of_stack(const struct task_struct *task)
+static __always_inline unsigned long *end_of_stack(const struct task_struct *task)
 {
 #ifdef CONFIG_STACK_GROWSUP
 	return (unsigned long *)((unsigned long)task->stack + THREAD_SIZE) - 1;