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ARM: vdso: Remove dependency with the arch_timer driver internals

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The VDSO code uses the kernel helper that was originally designed
to abstract the access between 32 and 64bit systems. It worked so
far because this function is declared as 'inline'.

As we're about to revamp that part of the code, the VDSO would
break. Let's fix it by doing what should have been done from
the start, a proper system register access.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Marc Zyngier 2019-04-08 16:49:01 +01:00 committed by Will Deacon
parent 6989303a3b
commit 1f5b62f09f
2 changed files with 5 additions and 2 deletions
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2
arch/arm/include/asm/cp15.h
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@ -68,6 +68,8 @@
#define BPIALL __ACCESS_CP15(c7, 0, c5, 6)
#define ICIALLU __ACCESS_CP15(c7, 0, c5, 0)
#define CNTVCT __ACCESS_CP15_64(1, c14)
extern unsigned long cr_alignment; /* defined in entry-armv.S */
static inline unsigned long get_cr(void)

5
arch/arm/vdso/vgettimeofday.c
View File

@ -18,9 +18,9 @@
#include <linux/compiler.h>
#include <linux/hrtimer.h>
#include <linux/time.h>
#include <asm/arch_timer.h>
#include <asm/barrier.h>
#include <asm/bug.h>
#include <asm/cp15.h>
#include <asm/page.h>
#include <asm/unistd.h>
#include <asm/vdso_datapage.h>
@ -123,7 +123,8 @@ static notrace u64 get_ns(struct vdso_data *vdata)
u64 cycle_now;
u64 nsec;
cycle_now = arch_counter_get_cntvct();
isb();
cycle_now = read_sysreg(CNTVCT);
cycle_delta = (cycle_now - vdata->cs_cycle_last) & vdata->cs_mask;