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authorMarc Zyngier <marc.zyngier@arm.com>2019-04-08 18:49:01 +0300
committerWill Deacon <will.deacon@arm.com>2019-04-30 18:09:07 +0300
commit1f5b62f09f6b314c8d70b9de5182dae4de1f94da (patch)
tree08a776abbfc1dad82ae646b908fc8ad28f100c59 /arch
parent6989303a3b2d864fd8e17d3fa3365d3e9649a598 (diff)
downloadlinux-1f5b62f09f6b314c8d70b9de5182dae4de1f94da.tar.xz
ARM: vdso: Remove dependency with the arch_timer driver internals
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/cp15.h2
-rw-r--r--arch/arm/vdso/vgettimeofday.c5
2 files changed, 5 insertions, 2 deletions
diff --git a/arch/arm/include/asm/cp15.h b/arch/arm/include/asm/cp15.h
index 07e27f212dc7..d2453e2d3f1f 100644
--- a/arch/arm/include/asm/cp15.h
+++ b/arch/arm/include/asm/cp15.h
@@ -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)
diff --git a/arch/arm/vdso/vgettimeofday.c b/arch/arm/vdso/vgettimeofday.c
index a9dd619c6c29..7bdbf5d5c47d 100644
--- a/arch/arm/vdso/vgettimeofday.c
+++ b/arch/arm/vdso/vgettimeofday.c
@@ -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;