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Revision 74ca317c26a3f8543203b61d262c0ab2e30c384e authored by Vivek Goyal on 29 August 2014, 22:18:46 UTC, committed by Linus Torvalds on 29 August 2014, 23:28:16 UTC 
kexec: create a new config option CONFIG_KEXEC_FILE for new syscall
 
Currently new system call kexec_file_load() and all the associated code
compiles if CONFIG_KEXEC=y.  But new syscall also compiles purgatory
code which currently uses gcc option -mcmodel=large.  This option seems
to be available only gcc 4.4 onwards.

Hiding new functionality behind a new config option will not break
existing users of old gcc.  Those who wish to enable new functionality
will require new gcc.  Having said that, I am trying to figure out how
can I move away from using -mcmodel=large but that can take a while.

I think there are other advantages of introducing this new config
option.  As this option will be enabled only on x86_64, other arches
don't have to compile generic kexec code which will never be used.  This
new code selects CRYPTO=y and CRYPTO_SHA256=y.  And all other arches had
to do this for CONFIG_KEXEC.  Now with introduction of new config
option, we can remove crypto dependency from other arches.

Now CONFIG_KEXEC_FILE is available only on x86_64.  So whereever I had
CONFIG_X86_64 defined, I got rid of that.

For CONFIG_KEXEC_FILE, instead of doing select CRYPTO=y, I changed it to
"depends on CRYPTO=y".  This should be safer as "select" is not
recursive.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Tested-by: Shaun Ruffell <sruffell@digium.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent b38af47
Raw File
pci.c 
/*
 * Register PCI controller.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1996, 1997, 2004, 05 by Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2001, 2002, 2003 by Liam Davies (ldavies@agile.tv)
 *
 */
#include <linux/init.h>
#include <linux/pci.h>

#include <asm/gt64120.h>

extern struct pci_ops gt64xxx_pci0_ops;

static struct resource cobalt_mem_resource = {
	.start	= GT_DEF_PCI0_MEM0_BASE,
	.end	= GT_DEF_PCI0_MEM0_BASE + GT_DEF_PCI0_MEM0_SIZE - 1,
	.name	= "PCI memory",
	.flags	= IORESOURCE_MEM,
};

static struct resource cobalt_io_resource = {
	.start	= 0x1000,
	.end	= 0xffffffUL,
	.name	= "PCI I/O",
	.flags	= IORESOURCE_IO,
};

static struct pci_controller cobalt_pci_controller = {
	.pci_ops	= &gt64xxx_pci0_ops,
	.mem_resource	= &cobalt_mem_resource,
	.io_resource	= &cobalt_io_resource,
	.io_offset	= 0 - GT_DEF_PCI0_IO_BASE,
	.io_map_base	= CKSEG1ADDR(GT_DEF_PCI0_IO_BASE),
};

static int __init cobalt_pci_init(void)
{
	register_pci_controller(&cobalt_pci_controller);

	return 0;
}

arch_initcall(cobalt_pci_init);
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