linux-kernel - [tip:x86/asm] x86/arch_prctl/64: Restore accidentally removed put_cpu() in ARCH_SET

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Message-ID: <tip-4afd0565552c87f23834db9121dd9cf6955d0b43@git.kernel.org>
Date:	Fri, 13 May 2016 04:51:38 -0700
From:	tip-bot for Mateusz Guzik <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	alexander.shishkin@...ux.intel.com, mguzik@...hat.com,
	bp@...en8.de, vincent.weaver@...ne.edu, mingo@...nel.org,
	peterz@...radead.org, acme@...hat.com,
	torvalds@...ux-foundation.org, luto@...capital.net,
	dvlasenk@...hat.com, luto@...nel.org, jolsa@...hat.com,
	brgerst@...il.com, eranian@...gle.com
Subject: [tip:x86/asm] x86/arch_prctl/64: Restore accidentally removed
 put_cpu() in ARCH_SET_GS

Commit-ID:  4afd0565552c87f23834db9121dd9cf6955d0b43
Gitweb:     http://git.kernel.org/tip/4afd0565552c87f23834db9121dd9cf6955d0b43
Author:     Mateusz Guzik <mguzik@...hat.com>
AuthorDate: Tue, 10 May 2016 22:56:43 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 13 May 2016 13:50:15 +0200

x86/arch_prctl/64: Restore accidentally removed put_cpu() in ARCH_SET_GS

This fixes an oversight in:

	731e33e39a5b95 ("Remove FSBASE/GSBASE < 4G optimization")

Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Link: http://lkml.kernel.org/r/1462913803-29634-1-git-send-email-mguzik@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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