From: Christoph Hellwig <hch@lst.de>
To: Palmer Dabbelt <palmer@sifive.com>,
Paul Walmsley <paul.walmsley@sifive.com>
Cc: Damien Le Moal <damien.lemoal@wdc.com>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
Atish Patra <atish.patra@wdc.com>
Subject: [PATCH 03/20] riscv: cleanup send_ipi_mask
Date: Tue, 3 Sep 2019 11:32:22 +0200 [thread overview]
Message-ID: <20190903093239.21278-4-hch@lst.de> (raw)
In-Reply-To: <20190903093239.21278-1-hch@lst.de>
Use the special barriers for atomic bitops to make the intention
a little more clear, and use riscv_cpuid_to_hartid_mask instead of
open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
---
arch/riscv/kernel/smp.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index 8cd730239613..2e21669aa068 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -80,17 +80,15 @@ static void ipi_stop(void)
static void send_ipi_mask(const struct cpumask *mask, enum ipi_message_type op)
{
- int cpuid, hartid;
struct cpumask hartid_mask;
+ int cpu;
- cpumask_clear(&hartid_mask);
- mb();
- for_each_cpu(cpuid, mask) {
- set_bit(op, &ipi_data[cpuid].bits);
- hartid = cpuid_to_hartid_map(cpuid);
- cpumask_set_cpu(hartid, &hartid_mask);
- }
- mb();
+ smp_mb__before_atomic();
+ for_each_cpu(cpu, mask)
+ set_bit(op, &ipi_data[cpu].bits);
+ smp_mb__after_atomic();
+
+ riscv_cpuid_to_hartid_mask(mask, &hartid_mask);
sbi_send_ipi(cpumask_bits(&hartid_mask));
}
--
2.20.1
next prev parent reply other threads:[~2019-09-03 9:32 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-03 9:32 RISC-V nommu support v4 Christoph Hellwig
2019-09-03 9:32 ` [PATCH 01/20] irqchip/sifive-plic: set max threshold for ignored handlers Christoph Hellwig
2019-09-03 9:32 ` [PATCH 02/20] riscv: refactor the IPI code Christoph Hellwig
2019-09-03 9:32 ` Christoph Hellwig [this message]
2019-09-03 9:32 ` [PATCH 04/20] riscv: optimize send_ipi_single Christoph Hellwig
2019-09-03 9:32 ` [PATCH 05/20] riscv: cleanup riscv_cpuid_to_hartid_mask Christoph Hellwig
2019-09-03 9:32 ` [PATCH 06/20] riscv: don't use the rdtime(h) pseudo-instructions Christoph Hellwig
2019-09-03 9:32 ` [PATCH 07/20] riscv: move the TLB flush logic out of line Christoph Hellwig
2019-09-03 9:32 ` [PATCH 08/20] riscv: abstract out CSR names for supervisor vs machine mode Christoph Hellwig
2019-10-16 2:07 ` Paul Walmsley
2019-10-17 16:20 ` Christoph Hellwig
2019-09-03 9:32 ` [PATCH 09/20] riscv: don't allow selecting SBI based drivers for M-mode Christoph Hellwig
2019-09-03 9:32 ` [PATCH 10/20] riscv: poison SBI calls " Christoph Hellwig
2019-09-03 9:32 ` [PATCH 11/20] riscv: cleanup the default power off implementation Christoph Hellwig
2019-09-03 9:32 ` [PATCH 12/20] riscv: implement remote sfence.i using IPIs Christoph Hellwig
2019-09-03 9:32 ` [PATCH 13/20] riscv: add support for MMIO access to the timer registers Christoph Hellwig
2019-09-03 9:32 ` [PATCH 14/20] riscv: provide native clint access for M-mode Christoph Hellwig
2019-09-03 9:32 ` [PATCH 15/20] riscv: read the hart ID from mhartid on boot Christoph Hellwig
2019-09-03 9:32 ` [PATCH 16/20] riscv: use the correct interrupt levels for M-mode Christoph Hellwig
2019-09-03 9:32 ` [PATCH 17/20] riscv: clear the instruction cache and all registers when booting Christoph Hellwig
2019-09-03 9:32 ` [PATCH 18/20] riscv: add nommu support Christoph Hellwig
2019-09-03 9:32 ` [PATCH 19/20] riscv: provide a flat image loader Christoph Hellwig
2019-09-03 9:32 ` [PATCH 20/20] riscv: disable the EFI PECOFF header for M-mode Christoph Hellwig
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