diff options
| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2022-01-31 14:26:20 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-02-14 12:27:38 -0800 |
| commit | 12f4a665cc3568328728e46c3162873b5b69cd27 (patch) | |
| tree | a094e398faaf8bb171303d8753fed50744d1ef36 /arch | |
| parent | 6df2a016c0c8a3d0933ef33dd192ea6606b115e3 (diff) | |
RISC-V: Fix hartid mask handling for hartid 31 and up
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@jrtc27.com>
Fixes: 26fb751ca37846c9 ("RISC-V: Do not use cpumask data structure for hartid bitmap")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/kernel/sbi.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c index f72527fcb347..f93bc75f2bc4 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) { |