linux-kernel - [PATCH] x86: MCA removal: garbage collect sys_desc

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Date:	Fri, 10 Jul 2015 16:48:17 +0200
From:	Paolo Pisati <p.pisati@...il.com>
To:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	josh@...htriplett.org, linux-kernel@...r.kernel.org
Subject: [PATCH] x86: MCA removal: garbage collect sys_desc_table

[resend adding Josh Triplett since he was interested in MCA removal for the
kernel tinification project]

Is sys_desc_table still used anywhere? It seems not:

arch/x86/boot/mca.c::query_mca()
...
    copy_from_fs(&boot_params.sys_desc_table, oreg.bx, len);
...

arch/x86/kernel/setup.c::setup_arch()
...
    if (boot_params.sys_desc_table.length != 0) {
        machine_id = boot_params.sys_desc_table.table[0];
        machine_submodel_id = boot_params.sys_desc_table.table[1];
        BIOS_revision = boot_params.sys_desc_table.table[2];
    }
...

$ git grep machine_id
...
arch/x86/include/asm/processor.h:extern unsigned int            machine_id;
arch/x86/kernel/setup.c:unsigned int machine_id;
arch/x86/kernel/setup.c:                machine_id = boot_params.sys_desc_table.table[0];
...

$ git grep machine_submodel_id
arch/x86/include/asm/processor.h:extern unsigned int machine_submodel_id;
arch/x86/kernel/setup.c:unsigned int machine_submodel_id;
arch/x86/kernel/setup.c:                machine_submodel_id = boot_params.sys_desc_table.table[1];

$ git grep BIOS_revision
arch/x86/include/asm/processor.h:extern unsigned int            BIOS_revision;
arch/x86/kernel/setup.c:unsigned int BIOS_revision;
arch/x86/kernel/setup.c:                BIOS_revision = boot_params.sys_desc_table.table[2];

Compile tested with i386_defconfig, x86_64_defconfig and allyesconfig.

Paolo Pisati (1):
  x86: MCA: garbage collect sys_desc_table

 Documentation/x86/zero-page.txt       |  1 -
 arch/x86/boot/Makefile                |  2 +-
 arch/x86/boot/boot.h                  |  3 ---
 arch/x86/boot/compressed/eboot.c      |  4 ----
 arch/x86/boot/main.c                  |  3 ---
 arch/x86/boot/mca.c                   | 38 -----------------------------------
 arch/x86/include/asm/processor.h      |  8 --------
 arch/x86/include/uapi/asm/bootparam.h | 19 +++++++-----------
 arch/x86/kernel/kexec-bzimage64.c     |  3 ---
 arch/x86/kernel/setup.c               |  5 -----
 10 files changed, 8 insertions(+), 78 deletions(-)
 delete mode 100644 arch/x86/boot/mca.c

-- 
2.1.4

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