From: Marc Gonzalez <marc.w.gonzalez@free.fr>
To: Matt Wagantall <mattw@codeaurora.org>,
Mitchel Humpherys <mitchelh@codeaurora.org>,
Will Deacon <will.deacon@arm.com>, Arnd Bergmann <arnd@arndb.de>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Bjorn Helgaas <helgaas@kernel.org>,
Douglas Anderson <dianders@chromium.org>
Subject: [PATCH v1] iopoll: Tweak readx_poll_timeout sleep range
Date: Thu, 13 Jun 2019 14:16:42 +0200 [thread overview]
Message-ID: <c2e6af51-5676-3715-6666-c3f18df7b992@free.fr> (raw)
Chopping max delay in 4 seems excessive. Let's just cut it in half.
Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
---
When max_us=100, old_min was 26 us; new_min would be 50 us
Was there a good reason for the 1/4th?
Is new_min=0 a problem? (for max=1)
---
include/linux/iopoll.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
index 3908353deec6..24a00d923c15 100644
--- a/include/linux/iopoll.h
+++ b/include/linux/iopoll.h
@@ -47,7 +47,7 @@
break; \
} \
if (__sleep_us) \
- usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
+ usleep_range(__sleep_us / 2, __sleep_us); \
} \
(cond) ? 0 : -ETIMEDOUT; \
})
--
2.17.1
next reply other threads:[~2019-06-13 15:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-13 12:16 Marc Gonzalez [this message]
2019-06-13 12:42 ` [PATCH v1] iopoll: Tweak readx_poll_timeout sleep range Arnd Bergmann
2019-06-13 16:04 ` Marc Gonzalez
2019-06-13 16:11 ` Doug Anderson
2019-06-13 16:36 ` Marc Gonzalez
2019-06-13 17:10 ` Doug Anderson
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