linux-kernel - [tip:locking/core] fork: Fix task

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Message-ID: <tip-95cb64c1fe61e70685a95f6260c8e9cd219fe08c@git.kernel.org>
Date:   Mon, 20 Feb 2017 02:25:09 -0800
From:   tip-bot for Peter Zijlstra <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, fengguang.wu@...el.com, tglx@...utronix.de,
        torvalds@...ux-foundation.org, peterz@...radead.org,
        linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: [tip:locking/core] fork: Fix task_struct alignment

Commit-ID:  95cb64c1fe61e70685a95f6260c8e9cd219fe08c
Gitweb:     http://git.kernel.org/tip/95cb64c1fe61e70685a95f6260c8e9cd219fe08c
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Sat, 18 Feb 2017 15:26:45 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 20 Feb 2017 11:22:37 +0100

fork: Fix task_struct alignment

Stupid bug that wrecked the alignment of task_struct and causes WARN()s
in the x86 FPU code on some platforms.

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Tested-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: e274795ea7b7 ("locking/mutex: Fix mutex handoff")
Link: http://lkml.kernel.org/r/20170218142645.GH6500@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/fork.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index a90510d..ea33f8a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -434,7 +434,7 @@ void __init fork_init(void)
 #ifndef ARCH_MIN_TASKALIGN
 #define ARCH_MIN_TASKALIGN	0
 #endif
-	int align = min_t(int, L1_CACHE_BYTES, ARCH_MIN_TASKALIGN);
+	int align = max_t(int, L1_CACHE_BYTES, ARCH_MIN_TASKALIGN);
 
 	/* create a slab on which task_structs can be allocated */
 	task_struct_cachep = kmem_cache_create("task_struct",