Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/mips/include/asm/vdso.h b/arch/mips/include/asm/vdso.h
index 91bf0c2..cc7b516 100644
--- a/arch/mips/include/asm/vdso.h
+++ b/arch/mips/include/asm/vdso.h
@@ -1,17 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2015 Imagination Technologies
* Author: Alex Smith <alex.smith@imgtec.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
*/
#ifndef __ASM_VDSO_H
#define __ASM_VDSO_H
#include <linux/mm_types.h>
+#include <vdso/datapage.h>
#include <asm/barrier.h>
@@ -53,84 +50,9 @@
extern struct mips_vdso_image vdso_image_n32;
#endif
-/**
- * union mips_vdso_data - Data provided by the kernel for the VDSO.
- * @xtime_sec: Current real time (seconds part).
- * @xtime_nsec: Current real time (nanoseconds part, shifted).
- * @wall_to_mono_sec: Wall-to-monotonic offset (seconds part).
- * @wall_to_mono_nsec: Wall-to-monotonic offset (nanoseconds part).
- * @seq_count: Counter to synchronise updates (odd = updating).
- * @cs_shift: Clocksource shift value.
- * @clock_mode: Clocksource to use for time functions.
- * @cs_mult: Clocksource multiplier value.
- * @cs_cycle_last: Clock cycle value at last update.
- * @cs_mask: Clocksource mask value.
- * @tz_minuteswest: Minutes west of Greenwich (from timezone).
- * @tz_dsttime: Type of DST correction (from timezone).
- *
- * This structure contains data needed by functions within the VDSO. It is
- * populated by the kernel and mapped read-only into user memory. The time
- * fields are mirrors of internal data from the timekeeping infrastructure.
- *
- * Note: Care should be taken when modifying as the layout must remain the same
- * for both 64- and 32-bit (for 32-bit userland on 64-bit kernel).
- */
union mips_vdso_data {
- struct {
- u64 xtime_sec;
- u64 xtime_nsec;
- u64 wall_to_mono_sec;
- u64 wall_to_mono_nsec;
- u32 seq_count;
- u32 cs_shift;
- u8 clock_mode;
- u32 cs_mult;
- u64 cs_cycle_last;
- u64 cs_mask;
- s32 tz_minuteswest;
- s32 tz_dsttime;
- };
-
+ struct vdso_data data[CS_BASES];
u8 page[PAGE_SIZE];
};
-static inline u32 vdso_data_read_begin(const union mips_vdso_data *data)
-{
- u32 seq;
-
- while (true) {
- seq = READ_ONCE(data->seq_count);
- if (likely(!(seq & 1))) {
- /* Paired with smp_wmb() in vdso_data_write_*(). */
- smp_rmb();
- return seq;
- }
-
- cpu_relax();
- }
-}
-
-static inline bool vdso_data_read_retry(const union mips_vdso_data *data,
- u32 start_seq)
-{
- /* Paired with smp_wmb() in vdso_data_write_*(). */
- smp_rmb();
- return unlikely(data->seq_count != start_seq);
-}
-
-static inline void vdso_data_write_begin(union mips_vdso_data *data)
-{
- ++data->seq_count;
-
- /* Ensure sequence update is written before other data page values. */
- smp_wmb();
-}
-
-static inline void vdso_data_write_end(union mips_vdso_data *data)
-{
- /* Ensure data values are written before updating sequence again. */
- smp_wmb();
- ++data->seq_count;
-}
-
#endif /* __ASM_VDSO_H */