linux-kernel - [PATCH 0/5] x86: Cleanups around slow_down

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Message-ID: <20251126162018.5676-1-jgross@suse.com>
Date: Wed, 26 Nov 2025 17:20:13 +0100
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org,
	x86@...nel.org,
	virtualization@...ts.linux.dev,
	kvm@...r.kernel.org,
	linux-hwmon@...r.kernel.org,
	linux-block@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ajay Kaher <ajay.kaher@...adcom.com>,
	Alexey Makhalov <alexey.makhalov@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	xen-devel@...ts.xenproject.org,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Denis Efremov <efremov@...ux.com>,
	Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 0/5] x86: Cleanups around slow_down_io()

While looking at paravirt cleanups I stumbled over slow_down_io() and
the related REALLY_SLOW_IO define.

Especially REALLY_SLOW_IO is a mess, which is proven by 2 completely
wrong use cases.

Do several cleanups, resulting in a deletion of REALLY_SLOW_IO and the
io_delay() paravirt function hook.

Patches 2 and 3 are not changing any functionality, but maybe they
should? As the potential bug has been present for more than a decade
now, I went with just deleting the useless "#define REALLY_SLOW_IO".
The alternative would be to do something similar as in patch 5.

Juergen Gross (5):
  x86/paravirt: Replace io_delay() hook with a bool
  hwmon/lm78: Drop REALLY_SLOW_IO setting
  hwmon/w83781d: Drop REALLY_SLOW_IO setting
  block/floppy: Don't use REALLY_SLOW_IO for delays
  x86/io: Remove REALLY_SLOW_IO handling

 arch/x86/include/asm/floppy.h         | 27 ++++++++++++++++++++++-----
 arch/x86/include/asm/io.h             | 12 +++++-------
 arch/x86/include/asm/paravirt.h       | 11 +----------
 arch/x86/include/asm/paravirt_types.h |  3 +--
 arch/x86/kernel/cpu/vmware.c          |  2 +-
 arch/x86/kernel/kvm.c                 |  8 +-------
 arch/x86/kernel/paravirt.c            |  3 +--
 arch/x86/xen/enlighten_pv.c           |  6 +-----
 drivers/block/floppy.c                |  2 --
 drivers/hwmon/lm78.c                  |  5 +++--
 drivers/hwmon/w83781d.c               |  5 +++--
 11 files changed, 39 insertions(+), 45 deletions(-)

-- 
2.51.0