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timekeeping/vsyscall: Update VDSO data unconditionally

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The update of the VDSO data is depending on __arch_use_vsyscall() returning
True. This is a leftover from the attempt to map the features of various
architectures 1:1 into generic code.

The usage of __arch_use_vsyscall() in the actual vsyscall implementations
got dropped and replaced by the requirement for the architecture code to
return U64_MAX if the global clocksource is not usable in the VDSO.

But the __arch_use_vsyscall() check in the update code stayed which causes
the VDSO data to be stale or invalid when an architecture actually
implements that function and returns False when the current clocksource is
not usable in the VDSO.

As a consequence the VDSO implementations of clock_getres(), time(),
clock_gettime(CLOCK_.*_COARSE) operate on invalid data and return bogus
information.

Remove the __arch_use_vsyscall() check from the VDSO update function and
update the VDSO data unconditionally.

[ tglx: Massaged changelog and removed the now useless implementations in
  	asm-generic/ARM64/MIPS ]

Fixes: 44f57d788e7deecb50 ("timekeeping: Provide a generic update_vsyscall() implementation")
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1571887709-11447-1-git-send-email-chenhc@lemote.com
This commit is contained in:
Huacai Chen 2019-10-24 11:28:29 +08:00 committed by Thomas Gleixner
parent d7e8d149c5
commit 52338415cf
4 changed files with 3 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm64/include/asm/vdso/vsyscall.h
View File

@ -30,13 +30,6 @@ int __arm64_get_clock_mode(struct timekeeper *tk)
}
#define __arch_get_clock_mode __arm64_get_clock_mode
static __always_inline
int __arm64_use_vsyscall(struct vdso_data *vdata)
{
return !vdata[CS_HRES_COARSE].clock_mode;
}
#define __arch_use_vsyscall __arm64_use_vsyscall
static __always_inline
void __arm64_update_vsyscall(struct vdso_data *vdata, struct timekeeper *tk)
{

7
arch/mips/include/asm/vdso/vsyscall.h
View File

@ -28,13 +28,6 @@ int __mips_get_clock_mode(struct timekeeper *tk)
}
#define __arch_get_clock_mode __mips_get_clock_mode
static __always_inline
int __mips_use_vsyscall(struct vdso_data *vdata)
{
return (vdata[CS_HRES_COARSE].clock_mode != VDSO_CLOCK_NONE);
}
#define __arch_use_vsyscall __mips_use_vsyscall
/* The asm-generic header needs to be included after the definitions above */
#include <asm-generic/vdso/vsyscall.h>

7
include/asm-generic/vdso/vsyscall.h
View File

@ -25,13 +25,6 @@ static __always_inline int __arch_get_clock_mode(struct timekeeper *tk)
}
#endif /* __arch_get_clock_mode */
#ifndef __arch_use_vsyscall
static __always_inline int __arch_use_vsyscall(struct vdso_data *vdata)
{
return 1;
}
#endif /* __arch_use_vsyscall */
#ifndef __arch_update_vsyscall
static __always_inline void __arch_update_vsyscall(struct vdso_data *vdata,
struct timekeeper *tk)

9
kernel/time/vsyscall.c
View File

@ -110,8 +110,7 @@ void update_vsyscall(struct timekeeper *tk)
nsec = nsec + tk->wall_to_monotonic.tv_nsec;
vdso_ts->sec += __iter_div_u64_rem(nsec, NSEC_PER_SEC, &vdso_ts->nsec);
if (__arch_use_vsyscall(vdata))
update_vdso_data(vdata, tk);
update_vdso_data(vdata, tk);
__arch_update_vsyscall(vdata, tk);
@ -124,10 +123,8 @@ void update_vsyscall_tz(void)
{
struct vdso_data *vdata = __arch_get_k_vdso_data();
if (__arch_use_vsyscall(vdata)) {
vdata[CS_HRES_COARSE].tz_minuteswest = sys_tz.tz_minuteswest;
vdata[CS_HRES_COARSE].tz_dsttime = sys_tz.tz_dsttime;
}
vdata[CS_HRES_COARSE].tz_minuteswest = sys_tz.tz_minuteswest;
vdata[CS_HRES_COARSE].tz_dsttime = sys_tz.tz_dsttime;
__arch_sync_vdso_data(vdata);
}