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ARM: use get_cr() rather than cr_alignment 

Rather than reading the cr_alignment variable, use get_cr() to read
directly from the hardware instead.  We have two places where this
occurs, neither of them are performance critical.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
hifive-unleashed-5.1
Russell King 2014-04-13 18:47:34 +01:00
parent 7668fd577b
commit 4585eaff63
3 changed files with 8 additions and 3 deletions
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7
arch/arm/include/asm/cp15.h
View File

@ -42,7 +42,7 @@
#ifndef __ASSEMBLY__
#if __LINUX_ARM_ARCH__ >= 4
#define vectors_high() (cr_alignment & CR_V)
#define vectors_high() (get_cr() & CR_V)
#else
#define vectors_high() (0)
#endif
@ -113,6 +113,11 @@ static inline void set_copro_access(unsigned int val)
#define cr_no_alignment UL(0)
#define cr_alignment UL(0)
static inline unsigned long get_cr(void)
{
return 0;
}
#endif /* ifdef CONFIG_CPU_CP15 / else */
#endif /* ifndef __ASSEMBLY__ */

2
arch/arm/kernel/setup.c
View File

@ -590,7 +590,7 @@ static void __init setup_processor(void)
pr_info("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
proc_arch[cpu_architecture()], cr_alignment);
proc_arch[cpu_architecture()], get_cr());
snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
list->arch_name, ENDIANNESS);

2
arch/arm/mm/alignment.c
View File

@ -91,7 +91,7 @@ core_param(alignment, ai_usermode, int, 0600);
/* Return true if and only if the ARMv6 unaligned access model is in use. */
static bool cpu_is_v6_unaligned(void)
{
return cpu_architecture() >= CPU_ARCH_ARMv6 && (cr_alignment & CR_U);
return cpu_architecture() >= CPU_ARCH_ARMv6 && get_cr() & CR_U;
}
static int safe_usermode(int new_usermode, bool warn)