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* [PATCH] x86/process: directly use try_get_task_stack() return value in get_wchan
@ 2021-08-03  8:48 Jisheng Zhang
  0 siblings, 0 replies; only message in thread
From: Jisheng Zhang @ 2021-08-03  8:48 UTC (permalink / raw)
  To: Thomas Gleixner, Ingo Molnar, Borislav Petkov
  Cc: x86, H. Peter Anvin, linux-kernel

try_get_task_stack() has already properly gets target task's stack,
no need to call task_stack_page() again.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 arch/x86/kernel/process.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 1d9463e3096b..d4a6503b3878 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -950,12 +950,9 @@ unsigned long get_wchan(struct task_struct *p)
 	if (p == current || task_is_running(p))
 		return 0;
 
-	if (!try_get_task_stack(p))
-		return 0;
-
-	start = (unsigned long)task_stack_page(p);
+	start = (unsigned long)try_get_task_stack(p);
 	if (!start)
-		goto out;
+		return 0;
 
 	/*
 	 * Layout of the stack page:
-- 
2.32.0


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2021-08-03  8:48 [PATCH] x86/process: directly use try_get_task_stack() return value in get_wchan Jisheng Zhang

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