From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 23 Jun 2021 12:02:08 +0000 (+0200)
Subject: x86/pkru: Provide pkru_get_init_value()
X-Git-Tag: accepted/tizen/unified/20230118.172025~6875^2~25
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=739e2eec0f4849eb411567407d61491f923db405;p=platform%2Fkernel%2Flinux-rpi.git

x86/pkru: Provide pkru_get_init_value()

When CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS is disabled then the following
code fails to compile:

     if (cpu_feature_enabled(X86_FEATURE_OSPKE)) {
     	u32 pkru = READ_ONCE(init_pkru_value);
	..
     }

because init_pkru_value is defined as '0' which makes READ_ONCE() upset.

Provide an accessor macro to avoid #ifdeffery all over the place.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121455.404880646@linutronix.de
---

diff --git a/arch/x86/include/asm/pkru.h b/arch/x86/include/asm/pkru.h
index ec8dd28..19d3d7b 100644
--- a/arch/x86/include/asm/pkru.h
+++ b/arch/x86/include/asm/pkru.h
@@ -10,8 +10,10 @@
 
 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
 extern u32 init_pkru_value;
+#define pkru_get_init_value()	READ_ONCE(init_pkru_value)
 #else
 #define init_pkru_value	0
+#define pkru_get_init_value()	0
 #endif
 
 static inline bool __pkru_allows_read(u32 pkru, u16 pkey)