From: Peter Zijlstra <peterz@infradead.org>
Date: Sat, 18 Feb 2017 14:26:45 +0000 (+0100)
Subject: fork: Fix task_struct alignment
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=95cb64c1fe61e70685a95f6260c8e9cd219fe08c;p=openwrt%2Fstaging%2Fblogic.git

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@intel.com>
Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.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@kernel.org>
---

diff --git a/kernel/fork.c b/kernel/fork.c
index a90510d0bbf8..ea33f8adc032 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",