[PATCH v2 1/3] RISC-V: Fix hartid mask handling for hartid 31 and up

[Geert Uytterhoeven]

Jessica reports that using "1 << hartid" causes undefined behavior for
hartid 31 and up.

Fix this by using the BIT() helper instead of an explicit shift.

Reported-by: Jessica Clarke <jrtc27 at jrtc27.com>
Fixes: 26fb751ca37846c9 ("RISC-V: Do not use cpumask data structure for hartid bitmap")
Signed-off-by: Geert Uytterhoeven <geert at linux-m68k.org>
Reviewed-by: Atish Patra <atishp at rivosinc.com>
Tested-by: Emil Renner Berthing <kernel at esmil.dk>
---
v2:
  - Add Reviewed-by, Tested-by.
---
 arch/riscv/kernel/sbi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
index f72527fcb34709a6..f93bc75f2bc43c8e 100644
--- a/arch/riscv/kernel/sbi.c
+++ b/arch/riscv/kernel/sbi.c
@@ -5,6 +5,7 @@
  * Copyright (c) 2020 Western Digital Corporation or its affiliates.
  */
 
+#include <linux/bits.h>
 #include <linux/init.h>
 #include <linux/pm.h>
 #include <linux/reboot.h>
@@ -85,7 +86,7 @@ static unsigned long __sbi_v01_cpumask_to_hartmask(const struct cpumask *cpu_mas
 			pr_warn("Unable to send any request to hartid > BITS_PER_LONG for SBI v0.1\n");
 			break;
 		}
-		hmask |= 1 << hartid;
+		hmask |= BIT(hartid);
 	}
 
 	return hmask;
@@ -268,7 +269,7 @@ static int __sbi_send_ipi_v02(const struct cpumask *cpu_mask)
 		}
 		if (!hmask)
 			hbase = hartid;
-		hmask |= 1UL << (hartid - hbase);
+		hmask |= BIT(hartid - hbase);
 	}
 
 	if (hmask) {
@@ -362,7 +363,7 @@ static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask,
 		}
 		if (!hmask)
 			hbase = hartid;
-		hmask |= 1UL << (hartid - hbase);
+		hmask |= BIT(hartid - hbase);
 	}
 
 	if (hmask) {
-- 
2.25.1