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linux-next/arch/mips/sgi-ip27/ip27-klnuma.c
Andrea Righi 27ac792ca0 PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures
On 32-bit architectures PAGE_ALIGN() truncates 64-bit values to the 32-bit
boundary. For example:

	u64 val = PAGE_ALIGN(size);

always returns a value < 4GB even if size is greater than 4GB.

The problem resides in PAGE_MASK definition (from include/asm-x86/page.h for
example):

#define PAGE_SHIFT      12
#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK       (~(PAGE_SIZE-1))
...
#define PAGE_ALIGN(addr)       (((addr)+PAGE_SIZE-1)&PAGE_MASK)

The "~" is performed on a 32-bit value, so everything in "and" with
PAGE_MASK greater than 4GB will be truncated to the 32-bit boundary.
Using the ALIGN() macro seems to be the right way, because it uses
typeof(addr) for the mask.

Also move the PAGE_ALIGN() definitions out of include/asm-*/page.h in
include/linux/mm.h.

See also lkml discussion: http://lkml.org/lkml/2008/6/11/237

[akpm@linux-foundation.org: fix drivers/media/video/uvc/uvc_queue.c]
[akpm@linux-foundation.org: fix v850]
[akpm@linux-foundation.org: fix powerpc]
[akpm@linux-foundation.org: fix arm]
[akpm@linux-foundation.org: fix mips]
[akpm@linux-foundation.org: fix drivers/media/video/pvrusb2/pvrusb2-dvb.c]
[akpm@linux-foundation.org: fix drivers/mtd/maps/uclinux.c]
[akpm@linux-foundation.org: fix powerpc]
Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-24 10:47:21 -07:00

137 lines
3.7 KiB
C

/*
* Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00.
* Copyright 2000 - 2001 Silicon Graphics, Inc.
* Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com)
*/
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/kernel.h>
#include <linux/nodemask.h>
#include <linux/string.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <asm/sn/types.h>
#include <asm/sn/arch.h>
#include <asm/sn/gda.h>
#include <asm/sn/hub.h>
#include <asm/sn/mapped_kernel.h>
#include <asm/sn/sn_private.h>
static cpumask_t ktext_repmask;
/*
* XXX - This needs to be much smarter about where it puts copies of the
* kernel. For example, we should never put a copy on a headless node,
* and we should respect the topology of the machine.
*/
void __init setup_replication_mask(void)
{
/* Set only the master cnode's bit. The master cnode is always 0. */
cpus_clear(ktext_repmask);
cpu_set(0, ktext_repmask);
#ifdef CONFIG_REPLICATE_KTEXT
#ifndef CONFIG_MAPPED_KERNEL
#error Kernel replication works with mapped kernel support. No calias support.
#endif
{
cnodeid_t cnode;
for_each_online_node(cnode) {
if (cnode == 0)
continue;
/* Advertise that we have a copy of the kernel */
cpu_set(cnode, ktext_repmask);
}
}
#endif
/* Set up a GDA pointer to the replication mask. */
GDA->g_ktext_repmask = &ktext_repmask;
}
static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
{
cnodeid_t client_cnode;
kern_vars_t *kvp;
client_cnode = NASID_TO_COMPACT_NODEID(client_nasid);
kvp = &hub_data(client_nasid)->kern_vars;
KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
kvp->kv_magic = KV_MAGIC;
kvp->kv_ro_nasid = server_nasid;
kvp->kv_rw_nasid = master_nasid;
kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
}
/* XXX - When the BTE works, we should use it instead of this. */
static __init void copy_kernel(nasid_t dest_nasid)
{
unsigned long dest_kern_start, source_start, source_end, kern_size;
source_start = (unsigned long) _stext;
source_end = (unsigned long) _etext;
kern_size = source_end - source_start;
dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
dest_nasid);
memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
}
void __init replicate_kernel_text()
{
cnodeid_t cnode;
nasid_t client_nasid;
nasid_t server_nasid;
server_nasid = master_nasid;
/* Record where the master node should get its kernel text */
set_ktext_source(master_nasid, master_nasid);
for_each_online_node(cnode) {
if (cnode == 0)
continue;
client_nasid = COMPACT_TO_NASID_NODEID(cnode);
/* Check if this node should get a copy of the kernel */
if (cpu_isset(cnode, ktext_repmask)) {
server_nasid = client_nasid;
copy_kernel(server_nasid);
}
/* Record where this node should get its kernel text */
set_ktext_source(client_nasid, server_nasid);
}
}
/*
* Return pfn of first free page of memory on a node. PROM may allocate
* data structures on the first couple of pages of the first slot of each
* node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
*/
pfn_t node_getfirstfree(cnodeid_t cnode)
{
unsigned long loadbase = REP_BASE;
nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
unsigned long offset;
#ifdef CONFIG_MAPPED_KERNEL
loadbase += 16777216;
#endif
offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask)))
return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
else
return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
PAGE_SHIFT);
}