linux-kernel - Re: unaligned accesses in SLAB etc.

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Message-Id: <20141018.142335.1935310766779155342.davem@davemloft.net>
Date:	Sat, 18 Oct 2014 14:23:35 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mroos@...ux.ee
Cc:	iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org, cl@...ux.com,
	penberg@...nel.org, rientjes@...gle.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, sparclinux@...r.kernel.org
Subject: Re: unaligned accesses in SLAB etc.

From: David Miller <davem@...emloft.net>
Date: Sat, 18 Oct 2014 13:59:07 -0400 (EDT)

> I don't want to define the array size of the fpregs save area
> explicitly and thereby placing an artificial limit there.

Nevermind, it seems we have a hard limit of 7 FPU save areas anyways.

Meelis, please try this patch:

diff --git a/arch/sparc/include/asm/thread_info_64.h b/arch/sparc/include/asm/thread_info_64.h
index f85dc85..cc6275c 100644
--- a/arch/sparc/include/asm/thread_info_64.h
+++ b/arch/sparc/include/asm/thread_info_64.h
@@ -63,7 +63,8 @@ struct thread_info {
 	struct pt_regs		*kern_una_regs;
 	unsigned int		kern_una_insn;
 
-	unsigned long		fpregs[0] __attribute__ ((aligned(64)));
+	unsigned long		fpregs[(7 * 256) / sizeof(unsigned long)]
+		__attribute__ ((aligned(64)));
 };
 
 #endif /* !(__ASSEMBLY__) */

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