[PATCH v7 08/11] riscv: Add a getter for user PMLEN support
From: Guodong Xu <hidden>
Date: 2026-09-15 07:17:25
Also in:
linux-devicetree, linux-kselftest, linux-riscv, lkml, spacemit
Subsystem:
risc-v architecture, the rest · Maintainers:
Paul Walmsley, Palmer Dabbelt, Albert Ou, Linus Torvalds
From: Andrew Jones <redacted> Querying whether a given user PMLEN is supported is needed for RVA23U64 base detection from outside arch/riscv/kernel/process.c. Add riscv_have_user_pmlen() to expose this. Link: https://lore.kernel.org/linux-riscv/rfuwa7a3ebe76udmnwyrssjy7shkkgxntvhwzn6oquysj4tuyp@xzvpylcfhz53/ (local) Signed-off-by: Andrew Jones <redacted> [Guodong: replace exported booleans with getter per Andrew's suggestion] Signed-off-by: Guodong Xu <redacted> --- v7: No change. v6: No change. v5: No change. v4: No change. v3: No change. v2: Add a getter for user PMLEN. --- arch/riscv/include/asm/processor.h | 4 ++++ arch/riscv/kernel/process.c | 12 ++++++++++++ 2 files changed, 16 insertions(+)
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 49a386d74cd3f..da9089695ed6a 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h@@ -217,6 +217,10 @@ long set_tagged_addr_ctrl(struct task_struct *task, unsigned long arg); long get_tagged_addr_ctrl(struct task_struct *task); #define SET_TAGGED_ADDR_CTRL(arg) set_tagged_addr_ctrl(current, arg) #define GET_TAGGED_ADDR_CTRL() get_tagged_addr_ctrl(current) + +bool riscv_have_user_pmlen(u8 len); +#else +static inline bool riscv_have_user_pmlen(u8 len) { return false; } #endif #endif /* __ASSEMBLER__ */
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index b2df7f72241a5..5d9cb108a6232 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c@@ -302,6 +302,18 @@ enum { static bool have_user_pmlen_7; static bool have_user_pmlen_16; +bool riscv_have_user_pmlen(u8 len) +{ + switch (len) { + case PMLEN_7: + return have_user_pmlen_7; + case PMLEN_16: + return have_user_pmlen_16; + default: + return false; + } +} + /* * Control the relaxed ABI allowing tagged user addresses into the kernel. */
--
2.43.0