linux-kernel - [PATCH] x86/mm: fix an unused variable "tsk" warning

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Date:   Fri, 31 May 2019 16:38:26 -0400
From:   Qian Cai <cai@....pw>
To:     mingo@...hat.com, tglx@...utronix.de, bp@...en8.de
Cc:     dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH] x86/mm: fix an unused variable "tsk" warning

"tsk" is only used when MEMORY_FAILURE=y.

arch/x86/mm/fault.c: In function 'do_sigbus':
arch/x86/mm/fault.c:1017:22: warning: unused variable 'tsk'
[-Wunused-variable]

Signed-off-by: Qian Cai <cai@....pw>
---
 arch/x86/mm/fault.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 46df4c6aae46..a10e518dcdf8 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1015,7 +1015,9 @@ static inline bool bad_area_access_from_pkeys(unsigned long error_code,
 do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
 	  vm_fault_t fault)
 {
+#ifdef CONFIG_MEMORY_FAILURE
 	struct task_struct *tsk = current;
+#endif
 
 	/* Kernel mode? Handle exceptions or die: */
 	if (!(error_code & X86_PF_USER)) {
-- 
1.8.3.1