From: Ira Weiny <[email protected]> Avoid open coding shift and mask operations by defining and using helper macros for PKey operations.
Signed-off-by: Ira Weiny <[email protected]> --- arch/x86/include/asm/pkeys_common.h | 6 +++++- arch/x86/include/asm/pkru.h | 6 ++---- arch/x86/mm/pkeys.c | 8 +++----- 3 files changed, 10 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/pkeys_common.h b/arch/x86/include/asm/pkeys_common.h index f3277717faeb..8a3c6d2e6a8a 100644 --- a/arch/x86/include/asm/pkeys_common.h +++ b/arch/x86/include/asm/pkeys_common.h @@ -6,6 +6,10 @@ #define PKR_WD_BIT 0x2 #define PKR_BITS_PER_PKEY 2 -#define PKR_AD_KEY(pkey) (PKR_AD_BIT << ((pkey) * PKR_BITS_PER_PKEY)) +#define PKR_PKEY_SHIFT(pkey) (pkey * PKR_BITS_PER_PKEY) +#define PKR_PKEY_MASK(pkey) (((1 << PKR_BITS_PER_PKEY) - 1) << PKR_PKEY_SHIFT(pkey)) + +#define PKR_AD_KEY(pkey) (PKR_AD_BIT << PKR_PKEY_SHIFT(pkey)) +#define PKR_WD_KEY(pkey) (PKR_WD_BIT << PKR_PKEY_SHIFT(pkey)) #endif /*_ASM_X86_PKEYS_COMMON_H */ diff --git a/arch/x86/include/asm/pkru.h b/arch/x86/include/asm/pkru.h index a74325b0d1df..fb44ff542028 100644 --- a/arch/x86/include/asm/pkru.h +++ b/arch/x86/include/asm/pkru.h @@ -15,15 +15,13 @@ extern u32 init_pkru_value; static inline bool __pkru_allows_read(u32 pkru, u16 pkey) { - int pkru_pkey_bits = pkey * PKR_BITS_PER_PKEY; - return !(pkru & (PKR_AD_BIT << pkru_pkey_bits)); + return !(pkru & PKR_AD_KEY(pkey)); } static inline bool __pkru_allows_write(u32 pkru, u16 pkey) { - int pkru_pkey_bits = pkey * PKR_BITS_PER_PKEY; /* Access-disable disables writes too so check both bits here. */ - return !(pkru & ((PKR_AD_BIT|PKR_WD_BIT) << pkru_pkey_bits)); + return !(pkru & (PKR_AD_KEY(pkey) | PKR_WD_KEY(pkey))); } static inline u32 read_pkru(void) diff --git a/arch/x86/mm/pkeys.c b/arch/x86/mm/pkeys.c index ca2e20b18645..75437aa8fc56 100644 --- a/arch/x86/mm/pkeys.c +++ b/arch/x86/mm/pkeys.c @@ -200,16 +200,14 @@ __setup("init_pkru=", setup_init_pkru); */ u32 update_pkey_val(u32 pk_reg, int pkey, unsigned int flags) { - int pkey_shift = pkey * PKR_BITS_PER_PKEY; - /* Mask out old bit values */ - pk_reg &= ~(((1 << PKR_BITS_PER_PKEY) - 1) << pkey_shift); + pk_reg &= ~PKR_PKEY_MASK(pkey); /* Or in new values */ if (flags & PKEY_DISABLE_ACCESS) - pk_reg |= PKR_AD_BIT << pkey_shift; + pk_reg |= PKR_AD_KEY(pkey); if (flags & PKEY_DISABLE_WRITE) - pk_reg |= PKR_WD_BIT << pkey_shift; + pk_reg |= PKR_WD_KEY(pkey); return pk_reg; } -- 2.28.0.rc0.12.gb6a658bd00c9
