linux-kernel - [PATCH] context_tracking: Use arch_atomic_*() in __ct_user_enter and __ct_user

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Date:   Thu, 10 Nov 2022 16:24:43 +0800
From:   Genjian <zhanggenjian123@...il.com>
To:     frederic@...nel.org, paulmck@...nel.org
Cc:     linux-kernel@...r.kernel.org, zhanggenjian123@...il.com,
        Genjian Zhang <zhanggenjian@...inos.cn>,
        k2ci <kernel-bot@...inos.cn>, kernel test robot <lkp@...el.com>
Subject: [PATCH] context_tracking: Use arch_atomic_*() in __ct_user_enter and __ct_user_exit

From: Genjian Zhang <zhanggenjian@...inos.cn>

vmlinux.o: warning: objtool: __ct_user_enter+0x45: call to
__kasan_check_write() leaves .noinstr.text section
vmlinux.o: warning: objtool: __ct_user_exit+0x3f: call to
__kasan_check_write() leaves .noinstr.text section

noinstr cannot have atomic_*() functions.because they have explicit
instrumentation.Switch to arch_ prefixed atomic operation functions to
avoid the explicit instrumentation.

Reported-by: k2ci <kernel-bot@...inos.cn>
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Genjian Zhang <zhanggenjian@...inos.cn>
---
 kernel/context_tracking.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 77978e372377..a09f1c19336a 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -510,7 +510,7 @@ void noinstr __ct_user_enter(enum ctx_state state)
 			 * In this we case we don't care about any concurrency/ordering.
 			 */
 			if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE))
-				atomic_set(&ct->state, state);
+				arch_atomic_set(&ct->state, state);
 		} else {
 			/*
 			 * Even if context tracking is disabled on this CPU, because it's outside
@@ -527,7 +527,7 @@ void noinstr __ct_user_enter(enum ctx_state state)
 			 */
 			if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE)) {
 				/* Tracking for vtime only, no concurrent RCU EQS accounting */
-				atomic_set(&ct->state, state);
+				arch_atomic_set(&ct->state, state);
 			} else {
 				/*
 				 * Tracking for vtime and RCU EQS. Make sure we don't race
@@ -535,7 +535,7 @@ void noinstr __ct_user_enter(enum ctx_state state)
 				 * RCU only requires RCU_DYNTICKS_IDX increments to be fully
 				 * ordered.
 				 */
-				atomic_add(state, &ct->state);
+				arch_atomic_add(state, &ct->state);
 			}
 		}
 	}
@@ -630,12 +630,12 @@ void noinstr __ct_user_exit(enum ctx_state state)
 			 * In this we case we don't care about any concurrency/ordering.
 			 */
 			if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE))
-				atomic_set(&ct->state, CONTEXT_KERNEL);
+				arch_atomic_set(&ct->state, CONTEXT_KERNEL);
 
 		} else {
 			if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE)) {
 				/* Tracking for vtime only, no concurrent RCU EQS accounting */
-				atomic_set(&ct->state, CONTEXT_KERNEL);
+				arch_atomic_set(&ct->state, CONTEXT_KERNEL);
 			} else {
 				/*
 				 * Tracking for vtime and RCU EQS. Make sure we don't race
@@ -643,7 +643,7 @@ void noinstr __ct_user_exit(enum ctx_state state)
 				 * RCU only requires RCU_DYNTICKS_IDX increments to be fully
 				 * ordered.
 				 */
-				atomic_sub(state, &ct->state);
+				arch_atomic_sub(state, &ct->state);
 			}
 		}
 	}
-- 
2.25.1