From: Andy Lutomirski <luto@kernel.org>
Date: Mon, 22 May 2017 15:30:02 -0700
Subject: x86/mm: Reduce indentation in flush_tlb_func()
Git-commit: b3b90e5af7976e46541f5029a369c9c38c5e4cea
Patch-mainline: v4.13-rc1
References: bsc#1068032 CVE-2017-5754

The leave_mm() case can just exit the function early so we don't
need to indent the entire remainder of the function.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/97901ddcc9821d7bc7b296d2918d1179f08aaf22.1495492063.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/mm/tlb.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index fe6471132ea3..4d303864b310 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -237,24 +237,26 @@ static void flush_tlb_func(void *info)
 		return;
 
 	count_vm_tlb_event(NR_TLB_REMOTE_FLUSH_RECEIVED);
-	if (this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK) {
-		if (f->flush_end == TLB_FLUSH_ALL) {
-			local_flush_tlb();
-			trace_tlb_flush(TLB_REMOTE_SHOOTDOWN, TLB_FLUSH_ALL);
-		} else {
-			unsigned long addr;
-			unsigned long nr_pages =
-				(f->flush_end - f->flush_start) / PAGE_SIZE;
-			addr = f->flush_start;
-			while (addr < f->flush_end) {
-				__flush_tlb_single(addr);
-				addr += PAGE_SIZE;
-			}
-			trace_tlb_flush(TLB_REMOTE_SHOOTDOWN, nr_pages);
-		}
-	} else
+
+	if (this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK) {
 		leave_mm(smp_processor_id());
+		return;
+	}
 
+	if (f->flush_end == TLB_FLUSH_ALL) {
+		local_flush_tlb();
+		trace_tlb_flush(TLB_REMOTE_SHOOTDOWN, TLB_FLUSH_ALL);
+	} else {
+		unsigned long addr;
+		unsigned long nr_pages =
+			(f->flush_end - f->flush_start) / PAGE_SIZE;
+		addr = f->flush_start;
+		while (addr < f->flush_end) {
+			__flush_tlb_single(addr);
+			addr += PAGE_SIZE;
+		}
+		trace_tlb_flush(TLB_REMOTE_SHOOTDOWN, nr_pages);
+	}
 }
 
 void native_flush_tlb_others(const struct cpumask *cpumask,