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52338415cf
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: 44f57d788e ("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
44 lines
970 B
C
44 lines
970 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_GENERIC_VSYSCALL_H
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#define __ASM_GENERIC_VSYSCALL_H
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#ifndef __ASSEMBLY__
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#ifndef __arch_get_k_vdso_data
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static __always_inline struct vdso_data *__arch_get_k_vdso_data(void)
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{
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return NULL;
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}
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#endif /* __arch_get_k_vdso_data */
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#ifndef __arch_update_vdso_data
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static __always_inline int __arch_update_vdso_data(void)
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{
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return 0;
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}
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#endif /* __arch_update_vdso_data */
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#ifndef __arch_get_clock_mode
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static __always_inline int __arch_get_clock_mode(struct timekeeper *tk)
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{
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return 0;
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}
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#endif /* __arch_get_clock_mode */
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#ifndef __arch_update_vsyscall
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static __always_inline void __arch_update_vsyscall(struct vdso_data *vdata,
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struct timekeeper *tk)
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{
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}
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#endif /* __arch_update_vsyscall */
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#ifndef __arch_sync_vdso_data
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static __always_inline void __arch_sync_vdso_data(struct vdso_data *vdata)
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{
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}
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#endif /* __arch_sync_vdso_data */
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_GENERIC_VSYSCALL_H */
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