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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
This commit is contained in:
Thomas Gleixner 2021-06-23 14:02:08 +02:00 committed by Borislav Petkov
parent 8a1dc55a3f
commit 739e2eec0f
1 changed files with 2 additions and 0 deletions
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2
arch/x86/include/asm/pkru.h
View File

@ -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)