riscv: vdso: Add symbols for the alternative section boundaries

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Currently the alternative sections are extracted from the vDSO
binaries at runtime. This has runtime overhead and also doesn't
work for the compat vDSO.

Extract the offsets of the alternative section during the build with the
existing symbol extraction machinery.

Also add dummy symbols as fallback.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Nam Cao <namcao@linutronix.de>
Link: https://patch.msgid.link/20260630-riscv-vdso32-alternative-v1-1-a32fd89b7b1c@linutronix.de
Signed-off-by: Paul Walmsley <pjw@kernel.org>

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Thomas Weißschuh 2026-08-07 19:24:33 -06:00 • committed by Paul Walmsley

parent f61959a3a8

commit 7f2a7bbcd9

2 changed files with 8 additions and 0 deletions

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6

arch/riscv/include/asm/vdso.h

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2

arch/riscv/kernel/vdso/vdso.lds.S

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