[PATCH] riscv: limit sifive errata to CONFIG_64BIT

[PATCH] riscv: limit sifive errata to CONFIG_64BIT

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

There are two errata for this vendor, and they both individually depend on
CONFIG_64BIT already. However, an 32-bit allmodconfig produces this warning
from clang for a condition that can never be true.

arch/riscv/errata/sifive/errata.c:29:14: error: result of comparison of constant 9223372036854775815 with expression of type 'unsigned long' is always true [-Werror,-Wtautological-constant-out-of-range-compare]
   29 |         if (arch_id != 0x8000000000000007 ||
      |             ~~~~~~~ ^  ~~~~~~~~~~~~~~~~~~
arch/riscv/errata/sifive/errata.c:42:14: error: result of comparison of constant 9223372036854775815 with expression of type 'unsigned long' is always true [-Werror,-Wtautological-constant-out-of-range-compare]
   42 |         if (arch_id != 0x8000000000000007 && arch_id != 0x1)
      |             ~~~~~~~ ^  ~~~~~~~~~~~~~~~~~~

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/riscv/Kconfig.errata | 2 +-
 arch/riscv/Kconfig.socs   | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig.errata b/arch/riscv/Kconfig.errata
index 3c945d086c7d..38ade0ea4e9c 100644
--- a/arch/riscv/Kconfig.errata
+++ b/arch/riscv/Kconfig.errata
@@ -46,7 +46,7 @@ config ERRATA_MIPS_P8700_PAUSE_OPCODE
 
 config ERRATA_SIFIVE
 	bool "SiFive errata"
-	depends on RISCV_ALTERNATIVE
+	depends on RISCV_ALTERNATIVE && 64BIT
 	help
 	  All SiFive errata Kconfig depend on this Kconfig. Disabling
 	  this Kconfig will disable all SiFive errata. Please say "Y"
diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
index 429e07589306..cecbce0c4983 100644
--- a/arch/riscv/Kconfig.socs
+++ b/arch/riscv/Kconfig.socs
@@ -34,6 +34,7 @@ config ARCH_RENESAS
 config ARCH_SIFIVE
 	bool "SiFive SoCs"
 	select ERRATA_SIFIVE
+	depends on 64BIT
 	help
 	  This enables support for SiFive SoC platform hardware.
 
-- 
2.53.0

Re: [PATCH] riscv: limit sifive errata to CONFIG_64BIT

[Paul Walmsley]

On Wed, 16 Sep 2026, Arnd Bergmann wrote:

> From: Arnd Bergmann <arnd@arndb.de>
> 
> There are two errata for this vendor, and they both individually depend on
> CONFIG_64BIT already. However, an 32-bit allmodconfig produces this warning
> from clang for a condition that can never be true.
> 
> arch/riscv/errata/sifive/errata.c:29:14: error: result of comparison of constant 9223372036854775815 with expression of type 'unsigned long' is always true [-Werror,-Wtautological-constant-out-of-range-compare]
>    29 |         if (arch_id != 0x8000000000000007 ||
>       |             ~~~~~~~ ^  ~~~~~~~~~~~~~~~~~~
> arch/riscv/errata/sifive/errata.c:42:14: error: result of comparison of constant 9223372036854775815 with expression of type 'unsigned long' is always true [-Werror,-Wtautological-constant-out-of-range-compare]
>    42 |         if (arch_id != 0x8000000000000007 && arch_id != 0x1)
>       |             ~~~~~~~ ^  ~~~~~~~~~~~~~~~~~~
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>


Thanks, queued for v7.3-rc.


- Paul