From: Leonardo Bras <leonardo@linux.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Leonardo Bras <leonardo@linux.ibm.com>,
Allison Randal <allison@lohutok.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH 1/1] ppc/smp: Replace unnecessary 'while' by 'if'
Date: Thu, 26 Mar 2020 17:37:52 -0300 [thread overview]
Message-ID: <20200326203752.497029-1-leonardo@linux.ibm.com> (raw)
spin_until_cond() will wait until nmi_ipi_busy == false, and
nmi_ipi_lock_start() does not seem to change nmi_ipi_busy, so there is
no way this while will ever repeat.
Replace this 'while' by an 'if', so it does not look like it can repeat.
Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
---
arch/powerpc/kernel/smp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index ea6adbf6a221..7c904d6fb4d2 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -473,7 +473,7 @@ static int __smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *),
return 0;
nmi_ipi_lock_start(&flags);
- while (nmi_ipi_busy) {
+ if (nmi_ipi_busy) {
nmi_ipi_unlock_end(&flags);
spin_until_cond(!nmi_ipi_busy);
nmi_ipi_lock_start(&flags);
--
2.24.1
next reply other threads:[~2020-03-26 20:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 20:37 Leonardo Bras [this message]
2020-03-26 21:40 ` [RFC PATCH 1/1] ppc/smp: Replace unnecessary 'while' by 'if' Paul Mackerras
2020-03-26 21:40 ` Paul Mackerras
2020-03-26 22:05 ` Leonardo Bras
2020-03-26 22:05 ` Leonardo Bras
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