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Revision 36be57ffe39e03aab9fbe857f70c7a6a15bd9e08 authored by Paul Jackson on 20 May 2006, 22:00:10 UTC, committed by Linus Torvalds on 21 May 2006, 19:59:18 UTC
Update the kernel/cpuset.c:cpuset_zone_allowed() comment. The rule for when mm/page_alloc.c should call cpuset_zone_allowed() was intended to be: Don't call cpuset_zone_allowed() if you can't sleep, unless you pass in the __GFP_HARDWALL flag set in gfp_flag, which disables the code that might scan up ancestor cpusets and sleep. The explanation of this rule in the comment above cpuset_zone_allowed() was stale, as a result of a restructuring of some __alloc_pages() code in November 2005. Rewrite that comment ... Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent bdd804f
Tip revision: 36be57ffe39e03aab9fbe857f70c7a6a15bd9e08 authored by Paul Jackson on 20 May 2006, 22:00:10 UTC
[PATCH] cpuset: update cpuset_zones_allowed comment
[PATCH] cpuset: update cpuset_zones_allowed comment
Tip revision: 36be57f
compr_rtime.c
/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright (C) 2001-2003 Red Hat, Inc.
*
* Created by Arjan van de Ven <arjanv@redhat.com>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: compr_rtime.c,v 1.14 2004/06/23 16:34:40 havasi Exp $
*
*
* Very simple lz77-ish encoder.
*
* Theory of operation: Both encoder and decoder have a list of "last
* occurrences" for every possible source-value; after sending the
* first source-byte, the second byte indicated the "run" length of
* matches
*
* The algorithm is intended to only send "whole bytes", no bit-messing.
*
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/jffs2.h>
#include "compr.h"
/* _compress returns the compressed size, -1 if bigger */
static int jffs2_rtime_compress(unsigned char *data_in,
unsigned char *cpage_out,
uint32_t *sourcelen, uint32_t *dstlen,
void *model)
{
short positions[256];
int outpos = 0;
int pos=0;
memset(positions,0,sizeof(positions));
while (pos < (*sourcelen) && outpos <= (*dstlen)-2) {
int backpos, runlen=0;
unsigned char value;
value = data_in[pos];
cpage_out[outpos++] = data_in[pos++];
backpos = positions[value];
positions[value]=pos;
while ((backpos < pos) && (pos < (*sourcelen)) &&
(data_in[pos]==data_in[backpos++]) && (runlen<255)) {
pos++;
runlen++;
}
cpage_out[outpos++] = runlen;
}
if (outpos >= pos) {
/* We failed */
return -1;
}
/* Tell the caller how much we managed to compress, and how much space it took */
*sourcelen = pos;
*dstlen = outpos;
return 0;
}
static int jffs2_rtime_decompress(unsigned char *data_in,
unsigned char *cpage_out,
uint32_t srclen, uint32_t destlen,
void *model)
{
short positions[256];
int outpos = 0;
int pos=0;
memset(positions,0,sizeof(positions));
while (outpos<destlen) {
unsigned char value;
int backoffs;
int repeat;
value = data_in[pos++];
cpage_out[outpos++] = value; /* first the verbatim copied byte */
repeat = data_in[pos++];
backoffs = positions[value];
positions[value]=outpos;
if (repeat) {
if (backoffs + repeat >= outpos) {
while(repeat) {
cpage_out[outpos++] = cpage_out[backoffs++];
repeat--;
}
} else {
memcpy(&cpage_out[outpos],&cpage_out[backoffs],repeat);
outpos+=repeat;
}
}
}
return 0;
}
static struct jffs2_compressor jffs2_rtime_comp = {
.priority = JFFS2_RTIME_PRIORITY,
.name = "rtime",
.compr = JFFS2_COMPR_RTIME,
.compress = &jffs2_rtime_compress,
.decompress = &jffs2_rtime_decompress,
#ifdef JFFS2_RTIME_DISABLED
.disabled = 1,
#else
.disabled = 0,
#endif
};
int jffs2_rtime_init(void)
{
return jffs2_register_compressor(&jffs2_rtime_comp);
}
void jffs2_rtime_exit(void)
{
jffs2_unregister_compressor(&jffs2_rtime_comp);
}
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