From: Mathieu Malaterre <malat@debian.org>
Date: Wed, 28 Mar 2018 19:58:11 +0000 (+0200)
Subject: powerpc/kvm: Prefer fault_in_pages_readable function
X-Git-Tag: v4.18-rc1~12^2~1^2~55^2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=9f9eae5ce717f497812dfc1bda5219bc589b455d;p=linux.git

powerpc/kvm: Prefer fault_in_pages_readable function

Directly use fault_in_pages_readable instead of manual __get_user code. Fix
warning treated as error with W=1:

  arch/powerpc/kernel/kvm.c:675:6: error: variable ‘tmp’ set but not used [-Werror=unused-but-set-variable]

Suggested-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 9ad37f827a97..683b5b3805bd 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -25,6 +25,7 @@
 #include <linux/kvm_para.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/pagemap.h>
 
 #include <asm/reg.h>
 #include <asm/sections.h>
@@ -672,14 +673,13 @@ static void kvm_use_magic_page(void)
 {
 	u32 *p;
 	u32 *start, *end;
-	u32 tmp;
 	u32 features;
 
 	/* Tell the host to map the magic page to -4096 on all CPUs */
 	on_each_cpu(kvm_map_magic_page, &features, 1);
 
 	/* Quick self-test to see if the mapping works */
-	if (__get_user(tmp, (u32*)KVM_MAGIC_PAGE)) {
+	if (!fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) {
 		kvm_patching_worked = false;
 		return;
 	}