[PATCH 01/11] vdso/datastore: Gate time data behind CONFIG_GENERIC_GETTIMEOFDAY
From: Thomas Weißschuh <hidden>
Date: 2025-08-26 06:18:20
Also in:
linux-arch, linux-arm-kernel, linux-kselftest, linux-mips, linux-riscv, linux-s390, lkml, loongarch
Subsystem:
generic vdso library, library code, the rest · Maintainers:
Andy Lutomirski, Thomas Gleixner, Vincenzo Frascino, Andrew Morton, Linus Torvalds
When the generic vDSO does not provide time functions, as for example on
riscv32, then the time data store is not necessary.
Avoid allocating these time data pages when not used.
Fixes: df7fcbefa710 ("vdso: Add generic time data storage")
Signed-off-by: Thomas Weißschuh <redacted>
---
lib/vdso/datastore.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/lib/vdso/datastore.c b/lib/vdso/datastore.c
index 3693c6caf2c4d41a526613d5fb746cb3a981ea2e..a565c30c71a04ff4116c14f43f4450210eba99c5 100644
--- a/lib/vdso/datastore.c
+++ b/lib/vdso/datastore.c@@ -11,14 +11,14 @@ /* * The vDSO data page. */ -#ifdef CONFIG_HAVE_GENERIC_VDSO +#ifdef CONFIG_GENERIC_GETTIMEOFDAY static union { struct vdso_time_data data; u8 page[PAGE_SIZE]; } vdso_time_data_store __page_aligned_data; struct vdso_time_data *vdso_k_time_data = &vdso_time_data_store.data; static_assert(sizeof(vdso_time_data_store) == PAGE_SIZE); -#endif /* CONFIG_HAVE_GENERIC_VDSO */ +#endif /* CONFIG_GENERIC_GETTIMEOFDAY */ #ifdef CONFIG_VDSO_GETRANDOM static union {
@@ -46,7 +46,7 @@ static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, switch (vmf->pgoff) { case VDSO_TIME_PAGE_OFFSET: - if (!IS_ENABLED(CONFIG_HAVE_GENERIC_VDSO)) + if (!IS_ENABLED(CONFIG_GENERIC_GETTIMEOFDAY)) return VM_FAULT_SIGBUS; pfn = __phys_to_pfn(__pa_symbol(vdso_k_time_data)); if (timens_page) {
--
2.50.1