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* [PATCH 0/8] RFC: Remove 386 support
@ 2012-11-28 19:50 H. Peter Anvin
  2012-11-28 19:50 ` [PATCH 1/8] x86, 386 removal: Remove CONFIG_M386 from Kconfig H. Peter Anvin
                   ` (7 more replies)
  0 siblings, 8 replies; 35+ messages in thread
From: H. Peter Anvin @ 2012-11-28 19:50 UTC (permalink / raw)
  To: H. Peter Anvin, Ingo Molnar, Thomas Gleixner, Linus Torvalds
  Cc: Linux Kernel Mailing List, Mario Gzuk, H. Peter Anvin

From: "H. Peter Anvin" <hpa@linux.intel.com>

According to kernel bugzilla 44931:

    https://bugzilla.kernel.org/show_bug.cgi?id=44931

... the Linux kernel hasn't actually been compiling for 386 for three
releases now.  I have verified that it doesn't, because the 386
fallback code for not having cmpxchg doesn't actually build.

Given that, I thought I'd refresh my patchset for completely removing
386 support and am inviting comments.

The code savings aren't huge, just under 400 lines of code, but this
is all code that very few if any people still care about.

Note that I have no inclination to remove support for 486.  486 and
clones are widely used in embedded applications and there is enough
traffic about them that I am quite sure people do still care about
some versions of those.

Comments appreciated.

 arch/x86/Kconfig                  | 11 ++----
 arch/x86/Kconfig.cpu              | 73 +++++++++++----------------------------
 arch/x86/Makefile_32.cpu          |  1 -
 arch/x86/include/asm/atomic.h     | 16 ---------
 arch/x86/include/asm/cmpxchg_32.h | 55 -----------------------------
 arch/x86/include/asm/cpufeature.h |  6 ----
 arch/x86/include/asm/futex.h      | 12 -------
 arch/x86/include/asm/local.h      | 18 +---------
 arch/x86/include/asm/module.h     |  2 --
 arch/x86/include/asm/percpu.h     |  3 --
 arch/x86/include/asm/processor.h  | 29 ++++++++++------
 arch/x86/include/asm/swab.h       | 29 ++--------------
 arch/x86/include/asm/tlbflush.h   |  3 --
 arch/x86/include/asm/uaccess.h    | 42 ----------------------
 arch/x86/kernel/cpu/amd.c         |  3 --
 arch/x86/kernel/cpu/bugs.c        | 41 ++--------------------
 arch/x86/kernel/cpu/intel.c       |  4 ---
 arch/x86/lib/Makefile             |  1 -
 arch/x86/lib/cmpxchg.c            | 54 -----------------------------
 arch/x86/lib/usercopy_32.c        | 57 ------------------------------
 arch/x86/mm/init_32.c             |  5 +--
 arch/x86/mm/tlb.c                 |  8 ++---
 arch/x86/um/Kconfig               |  2 +-
 arch/x86/xen/Kconfig              |  2 +-
 24 files changed, 52 insertions(+), 425 deletions(-)

^ permalink raw reply	[flat|nested] 35+ messages in thread

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Thread overview: 35+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-11-28 19:50 [PATCH 0/8] RFC: Remove 386 support H. Peter Anvin
2012-11-28 19:50 ` [PATCH 1/8] x86, 386 removal: Remove CONFIG_M386 from Kconfig H. Peter Anvin
2012-12-01  0:34   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 2/8] x86, 386 removal: Remove CONFIG_CMPXCHG H. Peter Anvin
2012-12-01  0:35   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 3/8] x86, 386 removal: Remove CONFIG_XADD H. Peter Anvin
2012-11-28 20:30   ` Borislav Petkov
2012-12-01  0:36   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 4/8] x86, 386 removal: Remove CONFIG_BSWAP H. Peter Anvin
2012-12-01  0:37   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 5/8] x86, 386 removal: Remove CONFIG_INVLPG H. Peter Anvin
2012-12-01  0:38   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 6/8] x86, 386 removal: Remove CONFIG_X86_WP_WORKS_OK H. Peter Anvin
2012-11-28 20:52   ` Alan Cox
2012-11-28 23:11     ` H. Peter Anvin
2012-12-01  0:42     ` [tip:x86/nuke386] x86, 386 removal: Document Nx586 as a 386 and thus unsupported tip-bot for H. Peter Anvin
2012-12-01  0:39   ` [tip:x86/nuke386] x86, 386 removal: Remove CONFIG_X86_WP_WORKS_OK tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 7/8] x86, 386 removal: Remove CONFIG_X86_POPAD_OK H. Peter Anvin
2012-12-01  0:40   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 8/8] x86, cleanups: Simplify sync_core() in the case of no CPUID H. Peter Anvin
2012-11-28 20:41   ` Borislav Petkov
2012-11-29  0:14     ` H. Peter Anvin
2012-11-29  9:13       ` Borislav Petkov
2012-11-29 21:06         ` H. Peter Anvin
2012-11-29 21:18           ` Borislav Petkov
2012-11-29 21:20             ` H. Peter Anvin
2012-11-29 21:31               ` Borislav Petkov
2012-11-29 21:24     ` H. Peter Anvin
2012-11-29 21:34       ` Borislav Petkov
2012-11-30 17:01       ` Linus Torvalds
2012-11-30 17:28         ` Borislav Petkov
2012-11-30 18:03         ` H. Peter Anvin
2012-11-30 18:10           ` Borislav Petkov
2012-11-30 18:40             ` H. Peter Anvin
2012-12-01  0:41   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin

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