(cherry picked from url https://patchwork.kernel.org/patch/
10044545/)
Take an effort to recode the arm64 vdso code from assembler to C
previously submitted by Andrew Pinski <apinski@cavium.com>, rework
it for use in both arm and arm64, overlapping any optimizations
for each architecture. But instead of landing it in arm64, land the
result into lib/vdso and unify both implementations to simplify
future maintenance.
Add clock_getres vdso support to match up with existing support in
the arm64's vdso.
Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Cc: James Morse <james.morse@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Andrew Pinski <apinski@cavium.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Bug:
63737556
Bug:
20045882
Change-Id: Ie37bf76d2992027f06a2cdd001d8654a860d2aac
if (!cntvct_ok) {
vdso_nullpatch_one(&einfo, "__vdso_gettimeofday");
vdso_nullpatch_one(&einfo, "__vdso_clock_gettime");
if (!cntvct_ok) {
vdso_nullpatch_one(&einfo, "__vdso_gettimeofday");
vdso_nullpatch_one(&einfo, "__vdso_clock_gettime");
+ vdso_nullpatch_one(&einfo, "__vdso_clock_getres");
#include <asm/processor.h> /* for cpu_relax() */
#include <asm/unistd.h>
#include <linux/compiler.h>
#include <asm/processor.h> /* for cpu_relax() */
#include <asm/unistd.h>
#include <linux/compiler.h>
+#include <linux/hrtimer.h> /* for LOW_RES_NSEC and MONOTONIC_RES_NSEC */
#include <linux/time.h> /* for NSEC_PER_SEC */
#ifndef CONFIG_AEABI
#include <linux/time.h> /* for NSEC_PER_SEC */
#ifndef CONFIG_AEABI
global:
__vdso_clock_gettime;
__vdso_gettimeofday;
global:
__vdso_clock_gettime;
__vdso_gettimeofday;
DEFINE_FALLBACK(gettimeofday, struct timeval *, tv, struct timezone *, tz)
DEFINE_FALLBACK(clock_gettime, clockid_t, clock, struct timespec *, ts)
DEFINE_FALLBACK(gettimeofday, struct timeval *, tv, struct timezone *, tz)
DEFINE_FALLBACK(clock_gettime, clockid_t, clock, struct timespec *, ts)
+DEFINE_FALLBACK(clock_getres, clockid_t, clock, struct timespec *, ts)
static notrace u32 vdso_read_begin(const struct vdso_data *vd)
{
static notrace u32 vdso_read_begin(const struct vdso_data *vd)
{
+
+int __vdso_clock_getres(clockid_t clock, struct timespec *res)
+{
+ long nsec;
+
+ if (clock == CLOCK_REALTIME ||
+ clock == CLOCK_MONOTONIC ||
+ clock == CLOCK_MONOTONIC_RAW)
+ nsec = MONOTONIC_RES_NSEC;
+ else if (clock == CLOCK_REALTIME_COARSE ||
+ clock == CLOCK_MONOTONIC_COARSE)
+ nsec = LOW_RES_NSEC;
+ else
+ return clock_getres_fallback(clock, res);
+
+ if (likely(res != NULL)) {
+ res->tv_sec = 0;
+ res->tv_nsec = nsec;
+ }
+
+ return 0;
+}