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Re: [PATCH v2 0/5] x86: Cleanups around slow_down_io()
- To: linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Fri, 9 Jan 2026 13:07:57 +0100
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- Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>, Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>, Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Denis Efremov <efremov@xxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>
- Delivery-date: Fri, 09 Jan 2026 12:08:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Gentle ping.
On 16.12.25 14:41, Juergen Gross wrote:
While looking at paravirt cleanups I stumbled over slow_down_io() and
the related REALLY_SLOW_IO define.
Do several cleanups, resulting in a deletion of REALLY_SLOW_IO and the
io_delay() paravirt function hook.
Patch 4 is removing the config options for selecting the default delay
mechanism and sets the default to "no delay". This is in preparation of
removing the io_delay() functionality completely, as suggested by Ingo
Molnar.
Patch 5 is adding an additional config option allowing to avoid
building io_delay.c (default is still to build it).
Changes in V2:
- patches 2 and 3 of V1 have been applied
- new patches 4 and 5
Juergen Gross (5):
x86/paravirt: Replace io_delay() hook with a bool
block/floppy: Don't use REALLY_SLOW_IO for delays
x86/io: Remove REALLY_SLOW_IO handling
x86/io_delay: Switch io_delay() default mechanism to "none"
x86/io_delay: Add config option for controlling build of io_delay.
arch/x86/Kconfig | 8 +++
arch/x86/Kconfig.debug | 30 ----------
arch/x86/include/asm/floppy.h | 31 ++++++++--
arch/x86/include/asm/io.h | 17 +++---
arch/x86/include/asm/paravirt.h | 11 +---
arch/x86/include/asm/paravirt_types.h | 3 +-
arch/x86/kernel/Makefile | 3 +-
arch/x86/kernel/cpu/vmware.c | 2 +-
arch/x86/kernel/io_delay.c | 81 +--------------------------
arch/x86/kernel/kvm.c | 8 +--
arch/x86/kernel/paravirt.c | 3 +-
arch/x86/kernel/setup.c | 4 +-
arch/x86/xen/enlighten_pv.c | 6 +-
drivers/block/floppy.c | 2 -
14 files changed, 55 insertions(+), 154 deletions(-)
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