[PATCH] riscv: enable HAVE_IOREMAP_PROT

[PATCH] riscv: enable HAVE_IOREMAP_PROT

[rom.wang]

From: Yufeng Wang <wangyufeng@kylinos.cn>

RISC-V has implemented pte_pgprot() and selects GENERIC_IOREMAP,
which provides a generic ioremap_prot() implementation. Enable
HAVE_IOREMAP_PROT to activate generic_access_phys() support, which
is useful for debugging (e.g., accessing /dev/mem via gdb).

Also update the architecture support documentation accordingly.

Signed-off-by: Yufeng Wang <wangyufeng@kylinos.cn>
---
 Documentation/features/vm/ioremap_prot/arch-support.txt | 2 +-
 arch/riscv/Kconfig                                      | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/features/vm/ioremap_prot/arch-support.txt b/Documentation/features/vm/ioremap_prot/arch-support.txt
index 1638c2cb17f1..c0a2d8f56046 100644
--- a/Documentation/features/vm/ioremap_prot/arch-support.txt
+++ b/Documentation/features/vm/ioremap_prot/arch-support.txt
@@ -20,7 +20,7 @@
     |    openrisc: | TODO |
     |      parisc: | TODO |
     |     powerpc: |  ok  |
-    |       riscv: | TODO |
+    |       riscv: |  ok  |
     |        s390: |  ok  |
     |          sh: |  ok  |
     |       sparc: | TODO |
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 90c531e6abf5..32b6aa8dece7 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -113,6 +113,7 @@ config RISCV
 	select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO && 64BIT
 	select GENERIC_IDLE_POLL_SETUP
 	select GENERIC_IOREMAP if MMU
+	select HAVE_IOREMAP_PROT if MMU
 	select GENERIC_IRQ_IPI if SMP
 	select GENERIC_IRQ_IPI_MUX if SMP
 	select GENERIC_IRQ_MULTI_HANDLER
-- 
2.34.1

Re: [PATCH] riscv: enable HAVE_IOREMAP_PROT

[Paul Walmsley]

On Fri, 6 Mar 2026, rom.wang wrote:

> From: Yufeng Wang <wangyufeng@kylinos.cn>
> 
> RISC-V has implemented pte_pgprot() and selects GENERIC_IOREMAP,
> which provides a generic ioremap_prot() implementation. Enable
> HAVE_IOREMAP_PROT to activate generic_access_phys() support, which
> is useful for debugging (e.g., accessing /dev/mem via gdb).
> 
> Also update the architecture support documentation accordingly.
> 
> Signed-off-by: Yufeng Wang <wangyufeng@kylinos.cn>

Thanks, queued for v7.1.


- Paul