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RISC-V: Fix handling of empty cpu masks

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The cpumask rework slightly changed the behavior of the code.  Fix this
by treating an empty cpumask as meaning all online CPUs.

Extracted from a patch by Atish Patra <atishp@rivosinc.com>.

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>
This commit is contained in:
Geert Uytterhoeven
2022-01-31 14:26:21 +01:00
committed by Palmer Dabbelt
parent 12f4a665cc
commit 2b35d5b7d1
1 changed files with 4 additions and 4 deletions
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8
arch/riscv/kernel/sbi.c
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@ -161,7 +161,7 @@ static int __sbi_send_ipi_v01(const struct cpumask *cpu_mask)
{
unsigned long hart_mask;
if (!cpu_mask)
if (!cpu_mask || cpumask_empty(cpu_mask))
cpu_mask = cpu_online_mask;
hart_mask = __sbi_v01_cpumask_to_hartmask(cpu_mask);
@ -177,7 +177,7 @@ static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_mask,
int result = 0;
unsigned long hart_mask;
if (!cpu_mask)
if (!cpu_mask || cpumask_empty(cpu_mask))
cpu_mask = cpu_online_mask;
hart_mask = __sbi_v01_cpumask_to_hartmask(cpu_mask);
@ -254,7 +254,7 @@ static int __sbi_send_ipi_v02(const struct cpumask *cpu_mask)
struct sbiret ret = {0};
int result;
if (!cpu_mask)
if (!cpu_mask || cpumask_empty(cpu_mask))
cpu_mask = cpu_online_mask;
for_each_cpu(cpuid, cpu_mask) {
@ -348,7 +348,7 @@ static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask,
unsigned long hartid, cpuid, hmask = 0, hbase = 0;
int result;
if (!cpu_mask)
if (!cpu_mask || cpumask_empty(cpu_mask))
cpu_mask = cpu_online_mask;
for_each_cpu(cpuid, cpu_mask) {