riscv: pgtable: Use riscv_has_extension_unlikely

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Use riscv_has_extension_unlikely() to check for RISCV_ISA_EXT_SVVPTC,
replacing the use of asm goto with ALTERNATIVE.

The "unlikely" variant is used to match the behavior of the original
implementation using ALTERNATIVE("nop", "j %l[svvptc]", ...).

Note that this makes the check for RISCV_ISA_EXT_SVVPTC a runtime one if
RISCV_ALTERNATIVE=n, but it should still be worthwhile to do so given
that TLB flushes are relatively slow.

Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>
Link: https://patch.msgid.link/20251020-riscv-altn-helper-wip-v4-1-ef941c87669a@iscas.ac.cn
Signed-off-by: Paul Walmsley <pjw@kernel.org>

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This commit is contained in:

Vivian Wang 2025-11-17 21:19:21 -07:00 • committed by Paul Walmsley

parent c9a7161044

commit 0a067ae21b

2 changed files with 17 additions and 20 deletions

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15

arch/riscv/include/asm/pgtable.h

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22

arch/riscv/mm/pgtable.c

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