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| author | Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2025-02-04 13:05:37 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-02-21 09:54:01 +0100 |
| commit | df7fcbefa71090a276fb841ffe19b8e5f12b4767 (patch) | |
| tree | efa7b1e59e09024b989e5911914df9070906c37c /kernel | |
| parent | vdso: Rename included Makefile (diff) | |
| download | linux-df7fcbefa71090a276fb841ffe19b8e5f12b4767.tar.gz linux-df7fcbefa71090a276fb841ffe19b8e5f12b4767.zip | |
vdso: Add generic time data storage
Historically each architecture defined their own way to store the vDSO
data page. Add a generic mechanism to provide storage for that page.
Furthermore this generic storage will be extended to also provide
uniform storage for *non*-time-related data, like the random state or
architecture-specific data. These will have their own pages and data
structures, so rename 'vdso_data' into 'vdso_time_data' to make that
split clear from the name.
Also introduce a new consistent naming scheme for the symbols related to
the vDSO, which makes it clear if the symbol is accessible from
userspace or kernel space and the type of data behind the symbol.
The generic fault handler contains an optimization to prefault the vvar
page when the timens page is accessed. This was lifted from s390 and x86.
Co-developed-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-5-13a4669dfc8c@linutronix.de
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/vsyscall.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/time/vsyscall.c b/kernel/time/vsyscall.c index 05d383143165..09c1e39a6dd8 100644 --- a/kernel/time/vsyscall.c +++ b/kernel/time/vsyscall.c @@ -77,7 +77,7 @@ static inline void update_vdso_data(struct vdso_data *vdata, void update_vsyscall(struct timekeeper *tk) { - struct vdso_data *vdata = __arch_get_k_vdso_data(); + struct vdso_data *vdata = vdso_k_time_data; struct vdso_timestamp *vdso_ts; s32 clock_mode; u64 nsec; @@ -128,7 +128,7 @@ void update_vsyscall(struct timekeeper *tk) void update_vsyscall_tz(void) { - struct vdso_data *vdata = __arch_get_k_vdso_data(); + struct vdso_data *vdata = vdso_k_time_data; vdata[CS_HRES_COARSE].tz_minuteswest = sys_tz.tz_minuteswest; vdata[CS_HRES_COARSE].tz_dsttime = sys_tz.tz_dsttime; @@ -150,7 +150,7 @@ void update_vsyscall_tz(void) */ unsigned long vdso_update_begin(void) { - struct vdso_data *vdata = __arch_get_k_vdso_data(); + struct vdso_data *vdata = vdso_k_time_data; unsigned long flags = timekeeper_lock_irqsave(); vdso_write_begin(vdata); @@ -167,7 +167,7 @@ unsigned long vdso_update_begin(void) */ void vdso_update_end(unsigned long flags) { - struct vdso_data *vdata = __arch_get_k_vdso_data(); + struct vdso_data *vdata = vdso_k_time_data; vdso_write_end(vdata); __arch_sync_vdso_data(vdata); |