Merge tag 'timers-vdso-2026-06-13' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip

Pull vdso updates from Thomas Gleixner:

 - Remove the redundant CONFIG_GENERIC_TIME_VSYSCALL after converting
   the remaining users over.

 - Rework and sanitize the MIPS VDSO handling, so it does not handle the
   time related VDSO if there is no VDSO capable clocksource available.
   Also stop mapping VDSO data pages unconditionally even if there is no
   usage possible.

* tag 'timers-vdso-2026-06-13' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip:
  MIPS: VDSO: Fold MIPS_CLOCK_VSYSCALL into MIPS_GENERIC_GETTIMEOFDAY
  MIPS: VDSO: Gate microMIPS restriction on GCC version
  MIPS: VDSO: Fold MIPS_DISABLE_VDSO into MIPS_GENERIC_GETTIMEOFDAY
  clocksource/drivers/mips-gic-timer: Only use VDSO_CLOCKMODE_GIC when it is a available
  MIPS: csrc-r4k: Only use VDSO_CLOCKMODE_R4K when it is a available
  MIPS: VDSO: Only map the data pages when the vDSO is used
  MIPS: Introduce Kconfig MIPS_GENERIC_GETTIMEOFDAY
  vdso/datastore: Always provide symbol declarations
  MAINTAINERS: Add include/linux/vdso_datastore.h to vDSO block
  vdso/gettimeofday: Rename __arch_get_vdso_u_timens_data()
  vdso/treewide: Drop GENERIC_TIME_VSYSCALL
  vdso/vsyscall: Gate update_vsyscall() behind CONFIG_GENERIC_GETTIMEOFDAY
  riscv: vdso: Drop CONFIG_GENERIC_TIME_VSYSCALL guard around syscall fallbacks

MAINTAINERS

@@ -10873,6 +10873,7 @@ L:	linux-kernel@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso
 F:	include/asm-generic/vdso/vsyscall.h
+F:	include/linux/vdso_datastore.h
 F:	include/vdso/
 F:	kernel/time/namespace_vdso.c
 F:	kernel/time/vsyscall.c

arch/arm/mm/Kconfig

@@ -925,7 +925,6 @@ config VDSO
 	depends on AEABI && MMU && CPU_V7
 	default y if ARM_ARCH_TIMER
 	select HAVE_GENERIC_VDSO
-	select GENERIC_TIME_VSYSCALL
 	select GENERIC_GETTIMEOFDAY
 	help
 	  Place in the process address space an ELF shared object

arch/arm64/Kconfig

@@ -140,7 +140,6 @@ config ARM64
 	select GENERIC_PCI_IOMAP
 	select GENERIC_SCHED_CLOCK
 	select GENERIC_SMP_IDLE_THREAD
-	select GENERIC_TIME_VSYSCALL
 	select GENERIC_GETTIMEOFDAY
 	select HARDIRQS_SW_RESEND
 	select HAS_IOPORT

arch/loongarch/Kconfig

@@ -110,7 +110,6 @@ config LOONGARCH
 	select GENERIC_PCI_IOMAP
 	select GENERIC_SCHED_CLOCK
 	select GENERIC_SMP_IDLE_THREAD
-	select GENERIC_TIME_VSYSCALL if GENERIC_GETTIMEOFDAY
 	select GPIOLIB
 	select HAS_IOPORT
 	select HAVE_ALIGNED_STRUCT_PAGE if 64BIT

arch/mips/Kconfig

@@ -38,7 +38,6 @@ config MIPS
 	select GENERIC_BUILTIN_DTB if BUILTIN_DTB
 	select GENERIC_CMOS_UPDATE
 	select GENERIC_CPU_AUTOPROBE
-	select GENERIC_GETTIMEOFDAY
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW
 	select GENERIC_ISA_DMA if EISA
@@ -51,7 +50,6 @@ config MIPS
 	select GENERIC_SCHED_CLOCK if !CAVIUM_OCTEON_SOC
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_IDLE_POLL_SETUP
-	select GENERIC_TIME_VSYSCALL
 	select GUP_GET_PXX_LOW_HIGH if CPU_MIPS32 && PHYS_ADDR_T_64BIT
 	select HAS_IOPORT if !NO_IOPORT_MAP || ISA
 	select HAVE_ARCH_COMPILER_H
@@ -76,7 +74,6 @@ config MIPS
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER
 	select HAVE_GCC_PLUGINS
-	select HAVE_GENERIC_VDSO
 	select HAVE_IOREMAP_PROT
 	select HAVE_IRQ_EXIT_ON_IRQ_STACK
 	select HAVE_IRQ_TIME_ACCOUNTING
@@ -1136,9 +1133,6 @@ config CSRC_R4K
 config CSRC_SB1250
 	bool
 
-config MIPS_CLOCK_VSYSCALL
-	def_bool CSRC_R4K || CLKSRC_MIPS_GIC
-
 config GPIO_TXX9
 	select GPIOLIB
 	bool
@@ -3170,6 +3164,16 @@ endmenu
 config MIPS_EXTERNAL_TIMER
 	bool
 
+config MIPS_GENERIC_GETTIMEOFDAY
+	def_bool y
+	select GENERIC_GETTIMEOFDAY
+	select HAVE_GENERIC_VDSO
+	depends on CSRC_R4K || CLKSRC_MIPS_GIC
+	# GCC (at least up to version 9.2) appears to emit function calls that make use
+	# of the GOT when targeting microMIPS, which we can't use in the VDSO due to
+	# the lack of relocations. As such, we disable the VDSO for microMIPS builds.
+	depends on !(CPU_MICROMIPS && CC_IS_GCC && GCC_VERSION < 90300)
+
 menu "CPU Power Management"
 
 if CPU_SUPPORTS_CPUFREQ && MIPS_EXTERNAL_TIMER
@@ -3181,5 +3185,3 @@ source "drivers/cpuidle/Kconfig"
 endmenu
 
 source "arch/mips/kvm/Kconfig"
-
-source "arch/mips/vdso/Kconfig"

arch/mips/kernel/csrc-r4k.c

@@ -126,12 +126,14 @@ int __init init_r4k_clocksource(void)
 	clocksource_mips.rating = 200;
 	clocksource_mips.rating += clamp(mips_hpt_frequency / 10000000, 0, 99);
 
+#ifdef CONFIG_GENERIC_GETTIMEOFDAY
 	/*
 	 * R2 onwards makes the count accessible to user mode so it can be used
 	 * by the VDSO (HWREna is configured by configure_hwrena()).
 	 */
 	if (cpu_has_mips_r2_r6 && rdhwr_count_usable())
 		clocksource_mips.vdso_clock_mode = VDSO_CLOCKMODE_R4K;
+#endif
 
 	clocksource_register_hz(&clocksource_mips, mips_hpt_frequency);
 

arch/mips/kernel/vdso.c

@@ -129,7 +129,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 	 * This ensures that when the kernel updates the VDSO data userland
 	 * will observe it without requiring cache invalidations.
 	 */
-	if (cpu_has_dc_aliases) {
+	if (cpu_has_dc_aliases && IS_ENABLED(CONFIG_HAVE_GENERIC_VDSO)) {
 		base = __ALIGN_MASK(base, shm_align_mask);
 		base += ((unsigned long)vdso_k_time_data - gic_size) & shm_align_mask;
 	}
@@ -137,10 +137,12 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 	data_addr = base + gic_size;
 	vdso_addr = data_addr + VDSO_NR_PAGES * PAGE_SIZE;
 
-	vma = vdso_install_vvar_mapping(mm, data_addr);
-	if (IS_ERR(vma)) {
-		ret = PTR_ERR(vma);
-		goto out;
+	if (IS_ENABLED(CONFIG_HAVE_GENERIC_VDSO)) {
+		vma = vdso_install_vvar_mapping(mm, data_addr);
+		if (IS_ERR(vma)) {
+			ret = PTR_ERR(vma);
+			goto out;
+		}
 	}
 
 	/* Map GIC user page. */

arch/mips/vdso/Kconfig

@@ -1,6 +0,0 @@
-# GCC (at least up to version 9.2) appears to emit function calls that make use
-# of the GOT when targeting microMIPS, which we can't use in the VDSO due to
-# the lack of relocations. As such, we disable the VDSO for microMIPS builds.
-
-config MIPS_DISABLE_VDSO
-	def_bool CPU_MICROMIPS

arch/mips/vdso/Makefile

@@ -4,7 +4,7 @@
 # Include the generic Makefile to check the built vdso.
 include $(srctree)/lib/vdso/Makefile.include
 
-obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
+obj-vdso-y := elf.o sigreturn.o
 
 # Common compiler flags between ABIs.
 ccflags-vdso := \
@@ -36,6 +36,7 @@ aflags-vdso := $(ccflags-vdso) \
 	-D__ASSEMBLY__ -Wa,-gdwarf-2
 
 ifneq ($(c-gettimeofday-y),)
+obj-vdso-y += vgettimeofday.o
 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
 
 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
@@ -47,10 +48,6 @@ endif
 
 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
 
-ifdef CONFIG_MIPS_DISABLE_VDSO
-  obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
-endif
-
 # VDSO linker flags.
 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
 	$(filter -E%,$(KBUILD_CFLAGS)) -shared \

arch/mips/vdso/vdso.lds.S

@@ -94,12 +94,10 @@ PHDRS
 VERSION
 {
 	LINUX_2.6 {
-#ifndef CONFIG_MIPS_DISABLE_VDSO
+#ifdef CONFIG_GENERIC_GETTIMEOFDAY
 	global:
 		__vdso_clock_gettime;
-#ifdef CONFIG_MIPS_CLOCK_VSYSCALL
 		__vdso_gettimeofday;
-#endif
 		__vdso_clock_getres;
 #if _MIPS_SIM != _MIPS_SIM_ABI64
 		__vdso_clock_gettime64;

arch/mips/vdso/vgettimeofday.c

@@ -18,22 +18,12 @@ int __vdso_clock_gettime(clockid_t clock,
 	return __cvdso_clock_gettime32(clock, ts);
 }
 
-#ifdef CONFIG_MIPS_CLOCK_VSYSCALL
-
-/*
- * This is behind the ifdef so that we don't provide the symbol when there's no
- * possibility of there being a usable clocksource, because there's nothing we
- * can do without it. When libc fails the symbol lookup it should fall back on
- * the standard syscall path.
- */
 int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
 			struct timezone *tz)
 {
 	return __cvdso_gettimeofday(tv, tz);
 }
 
-#endif /* CONFIG_MIPS_CLOCK_VSYSCALL */
-
 int __vdso_clock_getres(clockid_t clock_id,
 			struct old_timespec32 *res)
 {
@@ -59,22 +49,12 @@ int __vdso_clock_gettime(clockid_t clock,
 	return __cvdso_clock_gettime(clock, ts);
 }
 
-#ifdef CONFIG_MIPS_CLOCK_VSYSCALL
-
-/*
- * This is behind the ifdef so that we don't provide the symbol when there's no
- * possibility of there being a usable clocksource, because there's nothing we
- * can do without it. When libc fails the symbol lookup it should fall back on
- * the standard syscall path.
- */
 int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
 			struct timezone *tz)
 {
 	return __cvdso_gettimeofday(tv, tz);
 }
 
-#endif /* CONFIG_MIPS_CLOCK_VSYSCALL */
-
 int __vdso_clock_getres(clockid_t clock_id,
 			struct __kernel_timespec *res)
 {

arch/powerpc/Kconfig

@@ -213,7 +213,6 @@ config PPC
 	select GENERIC_IRQ_SHOW_LEVEL
 	select GENERIC_PCI_IOMAP		if PCI
 	select GENERIC_SMP_IDLE_THREAD
-	select GENERIC_TIME_VSYSCALL
 	select HAS_IOPORT			if PCI
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_HUGE_VMALLOC		if HAVE_ARCH_HUGE_VMAP

arch/riscv/Kconfig

@@ -122,7 +122,6 @@ config RISCV
 	select GENERIC_PCI_IOMAP
 	select GENERIC_SCHED_CLOCK
 	select GENERIC_SMP_IDLE_THREAD
-	select GENERIC_TIME_VSYSCALL if GENERIC_GETTIMEOFDAY
 	select HARDIRQS_SW_RESEND
 	select HAS_IOPORT if MMU
 	select HAVE_ALIGNED_STRUCT_PAGE

arch/riscv/include/asm/vdso/gettimeofday.h

@@ -9,12 +9,6 @@
 #include <asm/csr.h>
 #include <uapi/linux/time.h>
 
-/*
- * 32-bit land is lacking generic time vsyscalls as well as the legacy 32-bit
- * time syscalls like gettimeofday. Skip these definitions since on 32-bit.
- */
-#ifdef CONFIG_GENERIC_TIME_VSYSCALL
-
 #define VDSO_HAS_CLOCK_GETRES	1
 
 static __always_inline
@@ -66,8 +60,6 @@ int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
 	return ret;
 }
 
-#endif /* CONFIG_GENERIC_TIME_VSYSCALL */
-
 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
 						 const struct vdso_time_data *vd)
 {

arch/s390/Kconfig

@@ -174,7 +174,6 @@ config S390
 	select GENERIC_ENTRY
 	select GENERIC_GETTIMEOFDAY
 	select GENERIC_SMP_IDLE_THREAD
-	select GENERIC_TIME_VSYSCALL
 	select GENERIC_IOREMAP if PCI
 	select HAVE_ALIGNED_STRUCT_PAGE
 	select HAVE_ARCH_AUDITSYSCALL

arch/sparc/Kconfig

@@ -103,7 +103,6 @@ config SPARC64
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
-	select GENERIC_TIME_VSYSCALL
 	select ARCH_HAS_PTE_SPECIAL
 	select PCI_DOMAINS if PCI
 	select ARCH_HAS_GIGANTIC_PAGE

arch/x86/Kconfig

@@ -178,7 +178,6 @@ config X86
 	select GENERIC_IRQ_SHOW
 	select GENERIC_PENDING_IRQ		if SMP
 	select GENERIC_SMP_IDLE_THREAD
-	select GENERIC_TIME_VSYSCALL
 	select GENERIC_GETTIMEOFDAY
 	select GENERIC_VDSO_OVERFLOW_PROTECT
 	select GUP_GET_PXX_LOW_HIGH		if X86_PAE

drivers/clocksource/mips-gic-timer.c

@@ -198,7 +198,9 @@ static struct clocksource gic_clocksource = {
 	.name			= "GIC",
 	.read			= gic_hpt_read,
 	.flags			= CLOCK_SOURCE_IS_CONTINUOUS,
+#ifdef CONFIG_GENERIC_GETTIMEOFDAY
 	.vdso_clock_mode	= VDSO_CLOCKMODE_GIC,
+#endif
 };
 
 static void gic_clocksource_unstable(char *reason)

include/linux/timekeeper_internal.h

@@ -190,7 +190,7 @@ struct timekeeper {
 	s32			tai_offset;
 };
 
-#ifdef CONFIG_GENERIC_TIME_VSYSCALL
+#ifdef CONFIG_GENERIC_GETTIMEOFDAY
 
 extern void update_vsyscall(struct timekeeper *tk);
 extern void update_vsyscall_tz(void);

include/linux/vdso_datastore.h

@@ -2,12 +2,12 @@
 #ifndef _LINUX_VDSO_DATASTORE_H
 #define _LINUX_VDSO_DATASTORE_H
 
-#ifdef CONFIG_HAVE_GENERIC_VDSO
 #include <linux/mm_types.h>
 
 extern const struct vm_special_mapping vdso_vvar_mapping;
 struct vm_area_struct *vdso_install_vvar_mapping(struct mm_struct *mm, unsigned long addr);
 
+#ifdef CONFIG_HAVE_GENERIC_VDSO
 void __init vdso_setup_data_pages(void);
 #else /* !CONFIG_HAVE_GENERIC_VDSO */
 static inline void vdso_setup_data_pages(void) { }

kernel/time/Kconfig

@@ -16,10 +16,6 @@ config ARCH_CLOCKSOURCE_INIT
 config ARCH_WANTS_CLOCKSOURCE_READ_INLINE
 	bool
 
-# Timekeeping vsyscall support
-config GENERIC_TIME_VSYSCALL
-	bool
-
 # The generic clock events infrastructure
 config GENERIC_CLOCKEVENTS
 	def_bool !LEGACY_TIMER_TICK

lib/vdso/gettimeofday.c

@@ -126,7 +126,7 @@ bool vdso_get_timestamp(const struct vdso_time_data *vd, const struct vdso_clock
 }
 
 static __always_inline
-const struct vdso_time_data *__arch_get_vdso_u_timens_data(const struct vdso_time_data *vd)
+const struct vdso_time_data *vdso_timens_data(const struct vdso_time_data *vd)
 {
 	return (void *)vd + PAGE_SIZE;
 }
@@ -135,7 +135,7 @@ static __always_inline
 bool do_hres_timens(const struct vdso_time_data *vdns, const struct vdso_clock *vcns,
 		    clockid_t clk, struct __kernel_timespec *ts)
 {
-	const struct vdso_time_data *vd = __arch_get_vdso_u_timens_data(vdns);
+	const struct vdso_time_data *vd = vdso_timens_data(vdns);
 	const struct timens_offset *offs = &vcns->offset[clk];
 	const struct vdso_clock *vc = vd->clock_data;
 	u32 seq;
@@ -191,7 +191,7 @@ static __always_inline
 bool do_coarse_timens(const struct vdso_time_data *vdns, const struct vdso_clock *vcns,
 		      clockid_t clk, struct __kernel_timespec *ts)
 {
-	const struct vdso_time_data *vd = __arch_get_vdso_u_timens_data(vdns);
+	const struct vdso_time_data *vd = vdso_timens_data(vdns);
 	const struct timens_offset *offs = &vcns->offset[clk];
 	const struct vdso_clock *vc = vd->clock_data;
 	const struct vdso_timestamp *vdso_ts;
@@ -250,7 +250,7 @@ bool do_aux(const struct vdso_time_data *vd, clockid_t clock, struct __kernel_ti
 	do {
 		while (vdso_read_begin_timens(vc, &seq)) {
 			/* Re-read from the real time data page, reload seq by looping */
-			vd = __arch_get_vdso_u_timens_data(vd);
+			vd = vdso_timens_data(vd);
 			vc = &vd->aux_clock_data[idx];
 		}
 
@@ -360,7 +360,7 @@ __cvdso_gettimeofday_data(const struct vdso_time_data *vd,
 
 	if (unlikely(tz != NULL)) {
 		if (vdso_is_timens_clock(vc))
-			vd = __arch_get_vdso_u_timens_data(vd);
+			vd = vdso_timens_data(vd);
 
 		tz->tz_minuteswest = vd[CS_HRES_COARSE].tz_minuteswest;
 		tz->tz_dsttime = vd[CS_HRES_COARSE].tz_dsttime;
@@ -383,7 +383,7 @@ __cvdso_time_data(const struct vdso_time_data *vd, __kernel_old_time_t *time)
 	__kernel_old_time_t t;
 
 	if (vdso_is_timens_clock(vc)) {
-		vd = __arch_get_vdso_u_timens_data(vd);
+		vd = vdso_timens_data(vd);
 		vc = vd->clock_data;
 	}
 
@@ -414,7 +414,7 @@ bool __cvdso_clock_getres_common(const struct vdso_time_data *vd, clockid_t cloc
 		return false;
 
 	if (vdso_is_timens_clock(vc))
-		vd = __arch_get_vdso_u_timens_data(vd);
+		vd = vdso_timens_data(vd);
 
 	/*
 	 * Convert the clockid to a bitmask and use it to check which