linux-kernel - [PATCH] x86/arch_prctl/64: restore accidentally removed put_cpu in ARCH_SET

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Date:	Tue, 10 May 2016 22:56:43 +0200
From:	Mateusz Guzik <mguzik@...hat.com>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH] x86/arch_prctl/64: restore accidentally removed put_cpu in ARCH_SET_GS

This fixes 731e33e39a5b95ad770 "Remove FSBASE/GSBASE < 4G optimization"

Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
---
 arch/x86/kernel/process_64.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 4285f6a..6b16c36 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -541,6 +541,7 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
 			load_gs_index(0);
 			ret = wrmsrl_safe(MSR_KERNEL_GS_BASE, addr);
 		}
+		put_cpu();
 		break;
 	case ARCH_SET_FS:
 		/* Not strictly needed for fs, but do it for symmetry
-- 
1.8.3.1