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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-01-04 22:19:04 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-01-05 00:39:58 +0100 |
| commit | 1e5476815fd7f98b888e01a0f9522b63085f96c9 (patch) | |
| tree | 1c05ffeeba8b8e6c3058b8dcb88646b186ea8433 | |
| parent | 42f3bdc5dd962a5958bc024c1e1444248a6b8b4a (diff) | |
| download | linux-stable-1e5476815fd7f98b888e01a0f9522b63085f96c9.tar.gz linux-stable-1e5476815fd7f98b888e01a0f9522b63085f96c9.tar.bz2 linux-stable-1e5476815fd7f98b888e01a0f9522b63085f96c9.zip | |
x86/tlb: Drop the _GPL from the cpu_tlbstate export
The recent changes for PTI touch cpu_tlbstate from various tlb_flush
inlines. cpu_tlbstate is exported as GPL symbol, so this causes a
regression when building out of tree drivers for certain graphics cards.
Aside of that the export was wrong since it was introduced as it should
have been EXPORT_PER_CPU_SYMBOL_GPL().
Use the correct PER_CPU export and drop the _GPL to restore the previous
state which allows users to utilize the cards they payed for.
As always I'm really thrilled to make this kind of change to support the
#friends (or however the hot hashtag of today is spelled) from that closet
sauce graphics corp.
Fixes: 1e02ce4cccdc ("x86: Store a per-cpu shadow copy of CR4")
Fixes: 6fd166aae78c ("x86/mm: Use/Fix PCID to optimize user/kernel switches")
Reported-by: Kees Cook <keescook@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: stable@vger.kernel.org
| -rw-r--r-- | arch/x86/mm/init.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 80259ad8c386..6b462a472a7b 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -870,7 +870,7 @@ __visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) = { .next_asid = 1, .cr4 = ~0UL, /* fail hard if we screw up cr4 shadow initialization */ }; -EXPORT_SYMBOL_GPL(cpu_tlbstate); +EXPORT_PER_CPU_SYMBOL(cpu_tlbstate); void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache) { |