The generic vDSO provides a lot common functionality shared between different architectures. SPARC is the last architecture not using it, preventing some necessary code cleanup.
Make use of the generic infrastructure. Follow-up to and replacement for Arnd's SPARC vDSO removal patches: https://lore.kernel.org/lkml/[email protected]/ SPARC64 can not map .bss into userspace, so the vDSO datapages are switched over to be allocated dynamically. Tested on a Niagara T4 and QEMU. This has emantic conflicts with * "vdso: Reject absolute relocations during build" [0] * "vDSO: Respect COMPAT_32BIT_TIME" [1] But I expect both other serieses to need more discussions. [0] https://lore.kernel.org/lkml/[email protected]/ [1] https://lore.kernel.org/lkml/[email protected]/ Signed-off-by: Thomas Weißschuh <[email protected]> --- Changes in v6: - Provide statically allocated during early boot to avoid canges to the rng core - Use non-compound data pages - Reword commit messages - Rebase on v7.0-rc1 - Link to v5: https://lore.kernel.org/r/[email protected] Changes in v5: - Merge the patches for 'struct page' mapping and dynamic allocation - Zero out newly-allocated data pages - Pick up review tags - Link to v4: https://lore.kernel.org/r/[email protected] Changes in v4: - Rebase on v6.18-rc1. - Keep inclusion of asm/clocksource.h from linux/clocksource.h - Reword description of "s390/time: Set up vDSO datapage later" - Link to v3: https://lore.kernel.org/r/[email protected] Changes in v3: - Allocate vDSO data pages dynamically (and lots of preparations for that) - Drop clock_getres() - Fix 32bit clock_gettime() syscall fallback - Link to v2: https://lore.kernel.org/r/[email protected] Changes in v2: - Rebase on v6.17-rc1 - Drop RFC state - Fix typo in commit message - Drop duplicate 'select GENERIC_TIME_VSYSCALL' - Merge "sparc64: time: Remove architecture-specific clocksource data" into the main conversion patch. It violated the check in __clocksource_register_scale() - Link to v1: https://lore.kernel.org/r/[email protected] --- Arnd Bergmann (1): clocksource: remove ARCH_CLOCKSOURCE_DATA Thomas Weißschuh (13): vdso/datastore: Reduce scope of some variables in vvar_fault() vdso/datastore: Drop inclusion of linux/mmap_lock.h vdso/datastore: Allocate data pages dynamically sparc64: vdso: Link with -z noexecstack sparc64: vdso: Remove obsolete "fake section table" reservation sparc64: vdso: Replace code patching with runtime conditional sparc64: vdso: Move hardware counter read into header sparc64: vdso: Move syscall fallbacks into header sparc64: vdso: Introduce vdso/processor.h sparc64: vdso: Switch to the generic vDSO library sparc64: vdso2c: Drop sym_vvar_start handling sparc64: vdso2c: Remove symbol handling sparc64: vdso: Implement clock_gettime64() arch/sparc/Kconfig | 3 +- arch/sparc/include/asm/clocksource.h | 9 - arch/sparc/include/asm/processor.h | 3 + arch/sparc/include/asm/processor_32.h | 2 - arch/sparc/include/asm/processor_64.h | 25 -- arch/sparc/include/asm/vdso.h | 2 - arch/sparc/include/asm/vdso/clocksource.h | 10 + arch/sparc/include/asm/vdso/gettimeofday.h | 184 ++++++++++++++ arch/sparc/include/asm/vdso/processor.h | 41 ++++ arch/sparc/include/asm/vdso/vsyscall.h | 10 + arch/sparc/include/asm/vvar.h | 75 ------ arch/sparc/kernel/Makefile | 1 - arch/sparc/kernel/time_64.c | 6 +- arch/sparc/kernel/vdso.c | 69 ------ arch/sparc/vdso/Makefile | 8 +- arch/sparc/vdso/vclock_gettime.c | 380 ++--------------------------- arch/sparc/vdso/vdso-layout.lds.S | 26 +- arch/sparc/vdso/vdso.lds.S | 2 - arch/sparc/vdso/vdso2c.c | 24 -- arch/sparc/vdso/vdso2c.h | 45 +--- arch/sparc/vdso/vdso32/vdso32.lds.S | 4 +- arch/sparc/vdso/vma.c | 274 ++------------------- include/linux/clocksource.h | 6 +- include/linux/vdso_datastore.h | 6 + init/main.c | 2 + kernel/time/Kconfig | 4 - lib/vdso/datastore.c | 97 +++++--- 27 files changed, 375 insertions(+), 943 deletions(-) --- base-commit: f02e02079ac56b44ff89d4c2189cf7185ab794f3 change-id: 20250722-vdso-sparc64-generic-2-25f2e058e92c Best regards, -- Thomas Weißschuh <[email protected]>
