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Message-ID: <aAp6u9ylKCpvMJRF@gmail.com>
Date: Thu, 24 Apr 2025 19:54:03 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Arnd Bergmann <arnd@...db.de>,
kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
kernel test robot <lkp@...el.com>, linux-kernel@...r.kernel.org,
John Stultz <jstultz@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Stephen Boyd <sboyd@...nel.org>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>
Subject: [RFC PATCH 0/15] x86: Remove support for TSC-less and CX8-less CPUs
* Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> I really get the feeling that it's time to leave i486 support behind.
> There's zero real reason for anybody to waste one second of
> development effort on this kind of issue.
Fully agreed!
And to turn this idea into code, here's a very raw RFC series that
starts removing non-TSC 586 and 486 code and related support code from
the x86 architecture, with the goal to make TSC and CX8 (CMPXCHG8B)
support unconditionally available:
git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git WIP.x86/cpu
The full diffstat is nice, primarily due to the removal of the math-emu
library:
83 files changed, 30 insertions(+), 14683 deletions(-)
But even without the math-emu/ removal and the drivers/ pruning it's a
substantial simplification:
20 files changed, 29 insertions(+), 629 deletions(-)
The patches most relevant to this discussion should be:
x86/cpu: Remove M486/M486SX/ELAN support
...
x86/cpu: Remove TSC-less CONFIG_M586 support
x86/cpu: Make CONFIG_X86_TSC unconditional
x86/cpu: Make CONFIG_X86_CX8 unconditional
x86/percpu: Remove !CONFIG_X86_CX8 methods
x86/atomics: Remove !CONFIG_X86_CX8 methods
If there's no big objections about the scope of removal I'll finish it
by removing the non-TSC complications as well, and send out the series
to lkml for further review.
( Note that some of the patches in there are still WIP, as the branch
name suggests. )
Thanks,
Ingo
================>
Ingo Molnar (17):
x86/cpu: Remove M486/M486SX/ELAN support
x86/cpu: Remove the CONFIG_X86_INVD_BUG quirk
x86/cpu, cpufreq: Remove AMD ELAN support
x86/fpu: Remove MATH_EMULATION and related glue code
x86/fpu: Remove the 'no387' boot option
x86/fpu: Remove the math-emu/ FPU emulation library
x86/platform: Remove CONFIG_X86_RDC321X support
arch/x86, gpio: Remove GPIO_RDC321X support
arch/x86, watchdog: Remove the RDC321X_WDT watchdog driver
arch/x86, mfd: Remove MFD_RDC321X support
x86/reboot: Remove the RDC321X reboot quirk
x86/cpu: Remove CPU_SUP_UMC_32 support
x86/cpu: Remove TSC-less CONFIG_M586 support
x86/cpu: Make CONFIG_X86_TSC unconditional
x86/cpu: Make CONFIG_X86_CX8 unconditional
x86/percpu: Remove !X86_CX8 methods
x86/atomics: Remove !CONFIG_X86_CX8 methods
Documentation/admin-guide/kernel-parameters.txt | 4 -
arch/x86/Kconfig | 71 +-
arch/x86/Kconfig.cpu | 73 +-
arch/x86/Kconfig.cpufeatures | 2 -
arch/x86/Makefile | 1 -
arch/x86/Makefile_32.cpu | 6 -
arch/x86/include/asm/asm-prototypes.h | 4 -
arch/x86/include/asm/atomic64_32.h | 17 +-
arch/x86/include/asm/cmpxchg_32.h | 86 +-
arch/x86/include/asm/fpu/api.h | 6 -
arch/x86/include/asm/percpu.h | 6 +-
arch/x86/include/asm/vermagic.h | 8 -
arch/x86/kernel/cpu/common.c | 7 -
arch/x86/kernel/cpu/umc.c | 26 -
arch/x86/kernel/fpu/core.c | 5 -
arch/x86/kernel/fpu/init.c | 9 +-
arch/x86/kernel/reboot_fixups_32.c | 14 -
arch/x86/kernel/traps.c | 21 -
arch/x86/lib/Makefile | 4 -
arch/x86/lib/atomic64_386_32.S | 195 ---
arch/x86/lib/cmpxchg8b_emu.S | 97 --
arch/x86/math-emu/Makefile | 30 -
arch/x86/math-emu/README | 427 ------
arch/x86/math-emu/control_w.h | 46 -
arch/x86/math-emu/div_Xsig.S | 367 -----
arch/x86/math-emu/div_small.S | 48 -
arch/x86/math-emu/errors.c | 686 ----------
arch/x86/math-emu/exception.h | 51 -
arch/x86/math-emu/fpu_arith.c | 153 ---
arch/x86/math-emu/fpu_asm.h | 32 -
arch/x86/math-emu/fpu_aux.c | 267 ----
arch/x86/math-emu/fpu_emu.h | 218 ---
arch/x86/math-emu/fpu_entry.c | 718 ----------
arch/x86/math-emu/fpu_etc.c | 136 --
arch/x86/math-emu/fpu_proto.h | 157 ---
arch/x86/math-emu/fpu_system.h | 130 --
arch/x86/math-emu/fpu_tags.c | 116 --
arch/x86/math-emu/fpu_trig.c | 1649 -----------------------
arch/x86/math-emu/get_address.c | 401 ------
arch/x86/math-emu/load_store.c | 322 -----
arch/x86/math-emu/mul_Xsig.S | 179 ---
arch/x86/math-emu/poly.h | 115 --
arch/x86/math-emu/poly_2xm1.c | 146 --
arch/x86/math-emu/poly_atan.c | 209 ---
arch/x86/math-emu/poly_l2.c | 245 ----
arch/x86/math-emu/poly_sin.c | 379 ------
arch/x86/math-emu/poly_tan.c | 213 ---
arch/x86/math-emu/polynom_Xsig.S | 137 --
arch/x86/math-emu/reg_add_sub.c | 334 -----
arch/x86/math-emu/reg_compare.c | 479 -------
arch/x86/math-emu/reg_constant.c | 123 --
arch/x86/math-emu/reg_constant.h | 26 -
arch/x86/math-emu/reg_convert.c | 47 -
arch/x86/math-emu/reg_divide.c | 183 ---
arch/x86/math-emu/reg_ld_str.c | 1220 -----------------
arch/x86/math-emu/reg_mul.c | 116 --
arch/x86/math-emu/reg_norm.S | 150 ---
arch/x86/math-emu/reg_round.S | 711 ----------
arch/x86/math-emu/reg_u_add.S | 169 ---
arch/x86/math-emu/reg_u_div.S | 474 -------
arch/x86/math-emu/reg_u_mul.S | 150 ---
arch/x86/math-emu/reg_u_sub.S | 274 ----
arch/x86/math-emu/round_Xsig.S | 142 --
arch/x86/math-emu/shr_Xsig.S | 89 --
arch/x86/math-emu/status_w.h | 68 -
arch/x86/math-emu/version.h | 12 -
arch/x86/math-emu/wm_shrx.S | 207 ---
arch/x86/math-emu/wm_sqrt.S | 472 -------
drivers/cpufreq/Kconfig.x86 | 26 -
drivers/cpufreq/Makefile | 2 -
drivers/cpufreq/elanfreq.c | 227 ----
drivers/cpufreq/sc520_freq.c | 137 --
drivers/gpio/Kconfig | 8 -
drivers/gpio/Makefile | 1 -
drivers/gpio/gpio-rdc321x.c | 197 ---
drivers/mfd/Kconfig | 9 -
drivers/mfd/Makefile | 1 -
drivers/mfd/rdc321x-southbridge.c | 96 --
drivers/watchdog/Kconfig | 11 -
drivers/watchdog/Makefile | 1 -
drivers/watchdog/rdc321x_wdt.c | 281 ----
include/linux/mfd/rdc321x.h | 27 -
lib/atomic64_test.c | 4 +-
83 files changed, 30 insertions(+), 14683 deletions(-)
delete mode 100644 arch/x86/kernel/cpu/umc.c
delete mode 100644 arch/x86/lib/atomic64_386_32.S
delete mode 100644 arch/x86/lib/cmpxchg8b_emu.S
delete mode 100644 arch/x86/math-emu/Makefile
delete mode 100644 arch/x86/math-emu/README
delete mode 100644 arch/x86/math-emu/control_w.h
delete mode 100644 arch/x86/math-emu/div_Xsig.S
delete mode 100644 arch/x86/math-emu/div_small.S
delete mode 100644 arch/x86/math-emu/errors.c
delete mode 100644 arch/x86/math-emu/exception.h
delete mode 100644 arch/x86/math-emu/fpu_arith.c
delete mode 100644 arch/x86/math-emu/fpu_asm.h
delete mode 100644 arch/x86/math-emu/fpu_aux.c
delete mode 100644 arch/x86/math-emu/fpu_emu.h
delete mode 100644 arch/x86/math-emu/fpu_entry.c
delete mode 100644 arch/x86/math-emu/fpu_etc.c
delete mode 100644 arch/x86/math-emu/fpu_proto.h
delete mode 100644 arch/x86/math-emu/fpu_system.h
delete mode 100644 arch/x86/math-emu/fpu_tags.c
delete mode 100644 arch/x86/math-emu/fpu_trig.c
delete mode 100644 arch/x86/math-emu/get_address.c
delete mode 100644 arch/x86/math-emu/load_store.c
delete mode 100644 arch/x86/math-emu/mul_Xsig.S
delete mode 100644 arch/x86/math-emu/poly.h
delete mode 100644 arch/x86/math-emu/poly_2xm1.c
delete mode 100644 arch/x86/math-emu/poly_atan.c
delete mode 100644 arch/x86/math-emu/poly_l2.c
delete mode 100644 arch/x86/math-emu/poly_sin.c
delete mode 100644 arch/x86/math-emu/poly_tan.c
delete mode 100644 arch/x86/math-emu/polynom_Xsig.S
delete mode 100644 arch/x86/math-emu/reg_add_sub.c
delete mode 100644 arch/x86/math-emu/reg_compare.c
delete mode 100644 arch/x86/math-emu/reg_constant.c
delete mode 100644 arch/x86/math-emu/reg_constant.h
delete mode 100644 arch/x86/math-emu/reg_convert.c
delete mode 100644 arch/x86/math-emu/reg_divide.c
delete mode 100644 arch/x86/math-emu/reg_ld_str.c
delete mode 100644 arch/x86/math-emu/reg_mul.c
delete mode 100644 arch/x86/math-emu/reg_norm.S
delete mode 100644 arch/x86/math-emu/reg_round.S
delete mode 100644 arch/x86/math-emu/reg_u_add.S
delete mode 100644 arch/x86/math-emu/reg_u_div.S
delete mode 100644 arch/x86/math-emu/reg_u_mul.S
delete mode 100644 arch/x86/math-emu/reg_u_sub.S
delete mode 100644 arch/x86/math-emu/round_Xsig.S
delete mode 100644 arch/x86/math-emu/shr_Xsig.S
delete mode 100644 arch/x86/math-emu/status_w.h
delete mode 100644 arch/x86/math-emu/version.h
delete mode 100644 arch/x86/math-emu/wm_shrx.S
delete mode 100644 arch/x86/math-emu/wm_sqrt.S
delete mode 100644 drivers/cpufreq/elanfreq.c
delete mode 100644 drivers/cpufreq/sc520_freq.c
delete mode 100644 drivers/gpio/gpio-rdc321x.c
delete mode 100644 drivers/mfd/rdc321x-southbridge.c
delete mode 100644 drivers/watchdog/rdc321x_wdt.c
delete mode 100644 include/linux/mfd/rdc321x.h
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