2018-01-08 09:58:15 +00:00
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From 2b75ea581156c7f6d53cf736167e2d32c7087af5 Mon Sep 17 00:00:00 2001
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2018-01-08 09:25:09 +00:00
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Thu, 4 Jan 2018 22:19:04 +0100
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2018-01-08 10:50:09 +00:00
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Subject: [PATCH 234/242] x86/tlb: Drop the _GPL from the cpu_tlbstate export
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2018-01-08 09:25:09 +00:00
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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commit 1e5476815fd7f98b888e01a0f9522b63085f96c9 upstream.
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The recent changes for PTI touch cpu_tlbstate from various tlb_flush
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inlines. cpu_tlbstate is exported as GPL symbol, so this causes a
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regression when building out of tree drivers for certain graphics cards.
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Aside of that the export was wrong since it was introduced as it should
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have been EXPORT_PER_CPU_SYMBOL_GPL().
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Use the correct PER_CPU export and drop the _GPL to restore the previous
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state which allows users to utilize the cards they payed for.
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As always I'm really thrilled to make this kind of change to support the
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#friends (or however the hot hashtag of today is spelled) from that closet
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sauce graphics corp.
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Fixes: 1e02ce4cccdc ("x86: Store a per-cpu shadow copy of CR4")
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Fixes: 6fd166aae78c ("x86/mm: Use/Fix PCID to optimize user/kernel switches")
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Reported-by: Kees Cook <keescook@google.com>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Andy Lutomirski <luto@kernel.org>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/mm/init.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
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index 80259ad8c386..6b462a472a7b 100644
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--- a/arch/x86/mm/init.c
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+++ b/arch/x86/mm/init.c
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@@ -870,7 +870,7 @@ __visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) = {
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.next_asid = 1,
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.cr4 = ~0UL, /* fail hard if we screw up cr4 shadow initialization */
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};
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-EXPORT_SYMBOL_GPL(cpu_tlbstate);
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+EXPORT_PER_CPU_SYMBOL(cpu_tlbstate);
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void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache)
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{
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--
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2.14.2
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