[patch 23/38] alpha: Select ARCH_HAS_RANDOM_ENTROPY

Thomas Gleixner
2026-04-10T12:20:28Z

The only remaining usage of get_cycles() is to provide
random_get_entropy().

Switch alpha over to the new scheme of selecting ARCH_HAS_RANDOM_ENTROPY
and providing random_get_entropy() in asm/random.h.

Remove asm/timex.h as it has no functionality anymore.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: linux-alpha@vger.kernel.org
---
arch/alpha/Kconfig | 1 +
arch/alpha/include/asm/random.h | 14 ++++++++++++++
arch/alpha/include/asm/timex.h | 26 --------------------------
3 files changed, 15 insertions(+), 26 deletions(-)

--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -5,6 +5,7 @@ config ALPHA
select ARCH_32BIT_USTAT_F_TINODE
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DMA_OPS if PCI
+ select ARCH_HAS_RANDOM_ENTROPY
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
select ARCH_MODULE_NEEDS_WEAK_PER_CPU if SMP
--- /dev/null
+++ b/arch/alpha/include/asm/random.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASMALPHA_RANDOM_H
+#define _ASMALPHA_RANDOM_H
+
+/* Use the cycle counter for entropy. */
+static inline unsigned long random_get_entropy(void)
+{
+ unsigned long ret;
+
+ __asm__ __volatile__ ("rpcc %0" : "=r"(ret));
+ return ret;
+}
+
+#endif
--- a/arch/alpha/include/asm/timex.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * linux/include/asm-alpha/timex.h
- *
- * ALPHA architecture timex specifications
- */
-#ifndef _ASMALPHA_TIMEX_H
-#define _ASMALPHA_TIMEX_H
-
-/*
- * Standard way to access the cycle counter.
- * Currently only used on SMP for scheduling.
- *
- * Only the low 32 bits are available as a continuously counting entity.
- * But this only means we'll force a reschedule every 8 seconds or so,
- * which isn't an evil thing.
- */
-static inline cycles_t get_cycles (void)
-{
- cycles_t ret;
- __asm__ __volatile__ ("rpcc %0" : "=r"(ret));
- return ret;
-}
-#define get_cycles get_cycles
-
-#endif