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-rw-r--r--lib/Kconfig3
-rw-r--r--lib/Makefile2
-rw-r--r--lib/atomic64_test.c2
-rw-r--r--lib/dynamic_debug.c2
-rw-r--r--lib/genalloc.c1
-rw-r--r--lib/idr.c4
-rw-r--r--lib/lmb.c541
-rw-r--r--lib/rbtree.c116
8 files changed, 76 insertions, 595 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 170d8ca901d8..5b916bc0fbae 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -181,9 +181,6 @@ config HAS_DMA
181config CHECK_SIGNATURE 181config CHECK_SIGNATURE
182 bool 182 bool
183 183
184config HAVE_LMB
185 boolean
186
187config CPUMASK_OFFSTACK 184config CPUMASK_OFFSTACK
188 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 185 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
189 help 186 help
diff --git a/lib/Makefile b/lib/Makefile
index 3f1062cbbff4..0bfabba1bb32 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -89,8 +89,6 @@ obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o
89 89
90lib-$(CONFIG_GENERIC_BUG) += bug.o 90lib-$(CONFIG_GENERIC_BUG) += bug.o
91 91
92obj-$(CONFIG_HAVE_LMB) += lmb.o
93
94obj-$(CONFIG_HAVE_ARCH_TRACEHOOK) += syscall.o 92obj-$(CONFIG_HAVE_ARCH_TRACEHOOK) += syscall.o
95 93
96obj-$(CONFIG_DYNAMIC_DEBUG) += dynamic_debug.o 94obj-$(CONFIG_DYNAMIC_DEBUG) += dynamic_debug.o
diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index 250ed11d3ed2..44524cc8c32a 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -114,7 +114,7 @@ static __init int test_atomic64(void)
114 BUG_ON(v.counter != r); 114 BUG_ON(v.counter != r);
115 115
116#if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \ 116#if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \
117 defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) 117 defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) || defined(CONFIG_ARM)
118 INIT(onestwos); 118 INIT(onestwos);
119 BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1)); 119 BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
120 r -= one; 120 r -= one;
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 3df8eb17a607..02afc2533728 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -692,7 +692,7 @@ static void ddebug_table_free(struct ddebug_table *dt)
692 * Called in response to a module being unloaded. Removes 692 * Called in response to a module being unloaded. Removes
693 * any ddebug_table's which point at the module. 693 * any ddebug_table's which point at the module.
694 */ 694 */
695int ddebug_remove_module(char *mod_name) 695int ddebug_remove_module(const char *mod_name)
696{ 696{
697 struct ddebug_table *dt, *nextdt; 697 struct ddebug_table *dt, *nextdt;
698 int ret = -ENOENT; 698 int ret = -ENOENT;
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 736c3b06398e..1923f1490e72 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -128,7 +128,6 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
128 chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk); 128 chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
129 129
130 end_bit = (chunk->end_addr - chunk->start_addr) >> order; 130 end_bit = (chunk->end_addr - chunk->start_addr) >> order;
131 end_bit -= nbits + 1;
132 131
133 spin_lock_irqsave(&chunk->lock, flags); 132 spin_lock_irqsave(&chunk->lock, flags);
134 start_bit = bitmap_find_next_zero_area(chunk->bits, end_bit, 0, 133 start_bit = bitmap_find_next_zero_area(chunk->bits, end_bit, 0,
diff --git a/lib/idr.c b/lib/idr.c
index c1a206901761..7f1a4f0acf50 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -602,7 +602,7 @@ void *idr_get_next(struct idr *idp, int *nextidp)
602 /* find first ent */ 602 /* find first ent */
603 n = idp->layers * IDR_BITS; 603 n = idp->layers * IDR_BITS;
604 max = 1 << n; 604 max = 1 << n;
605 p = rcu_dereference(idp->top); 605 p = rcu_dereference_raw(idp->top);
606 if (!p) 606 if (!p)
607 return NULL; 607 return NULL;
608 608
@@ -610,7 +610,7 @@ void *idr_get_next(struct idr *idp, int *nextidp)
610 while (n > 0 && p) { 610 while (n > 0 && p) {
611 n -= IDR_BITS; 611 n -= IDR_BITS;
612 *paa++ = p; 612 *paa++ = p;
613 p = rcu_dereference(p->ary[(id >> n) & IDR_MASK]); 613 p = rcu_dereference_raw(p->ary[(id >> n) & IDR_MASK]);
614 } 614 }
615 615
616 if (p) { 616 if (p) {
diff --git a/lib/lmb.c b/lib/lmb.c
deleted file mode 100644
index b1fc52606524..000000000000
--- a/lib/lmb.c
+++ /dev/null
@@ -1,541 +0,0 @@
1/*
2 * Procedures for maintaining information about logical memory blocks.
3 *
4 * Peter Bergner, IBM Corp. June 2001.
5 * Copyright (C) 2001 Peter Bergner.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/bitops.h>
16#include <linux/lmb.h>
17
18#define LMB_ALLOC_ANYWHERE 0
19
20struct lmb lmb;
21
22static int lmb_debug;
23
24static int __init early_lmb(char *p)
25{
26 if (p && strstr(p, "debug"))
27 lmb_debug = 1;
28 return 0;
29}
30early_param("lmb", early_lmb);
31
32static void lmb_dump(struct lmb_region *region, char *name)
33{
34 unsigned long long base, size;
35 int i;
36
37 pr_info(" %s.cnt = 0x%lx\n", name, region->cnt);
38
39 for (i = 0; i < region->cnt; i++) {
40 base = region->region[i].base;
41 size = region->region[i].size;
42
43 pr_info(" %s[0x%x]\t0x%016llx - 0x%016llx, 0x%llx bytes\n",
44 name, i, base, base + size - 1, size);
45 }
46}
47
48void lmb_dump_all(void)
49{
50 if (!lmb_debug)
51 return;
52
53 pr_info("LMB configuration:\n");
54 pr_info(" rmo_size = 0x%llx\n", (unsigned long long)lmb.rmo_size);
55 pr_info(" memory.size = 0x%llx\n", (unsigned long long)lmb.memory.size);
56
57 lmb_dump(&lmb.memory, "memory");
58 lmb_dump(&lmb.reserved, "reserved");
59}
60
61static unsigned long lmb_addrs_overlap(u64 base1, u64 size1, u64 base2,
62 u64 size2)
63{
64 return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
65}
66
67static long lmb_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2)
68{
69 if (base2 == base1 + size1)
70 return 1;
71 else if (base1 == base2 + size2)
72 return -1;
73
74 return 0;
75}
76
77static long lmb_regions_adjacent(struct lmb_region *rgn,
78 unsigned long r1, unsigned long r2)
79{
80 u64 base1 = rgn->region[r1].base;
81 u64 size1 = rgn->region[r1].size;
82 u64 base2 = rgn->region[r2].base;
83 u64 size2 = rgn->region[r2].size;
84
85 return lmb_addrs_adjacent(base1, size1, base2, size2);
86}
87
88static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
89{
90 unsigned long i;
91
92 for (i = r; i < rgn->cnt - 1; i++) {
93 rgn->region[i].base = rgn->region[i + 1].base;
94 rgn->region[i].size = rgn->region[i + 1].size;
95 }
96 rgn->cnt--;
97}
98
99/* Assumption: base addr of region 1 < base addr of region 2 */
100static void lmb_coalesce_regions(struct lmb_region *rgn,
101 unsigned long r1, unsigned long r2)
102{
103 rgn->region[r1].size += rgn->region[r2].size;
104 lmb_remove_region(rgn, r2);
105}
106
107void __init lmb_init(void)
108{
109 /* Create a dummy zero size LMB which will get coalesced away later.
110 * This simplifies the lmb_add() code below...
111 */
112 lmb.memory.region[0].base = 0;
113 lmb.memory.region[0].size = 0;
114 lmb.memory.cnt = 1;
115
116 /* Ditto. */
117 lmb.reserved.region[0].base = 0;
118 lmb.reserved.region[0].size = 0;
119 lmb.reserved.cnt = 1;
120}
121
122void __init lmb_analyze(void)
123{
124 int i;
125
126 lmb.memory.size = 0;
127
128 for (i = 0; i < lmb.memory.cnt; i++)
129 lmb.memory.size += lmb.memory.region[i].size;
130}
131
132static long lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
133{
134 unsigned long coalesced = 0;
135 long adjacent, i;
136
137 if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
138 rgn->region[0].base = base;
139 rgn->region[0].size = size;
140 return 0;
141 }
142
143 /* First try and coalesce this LMB with another. */
144 for (i = 0; i < rgn->cnt; i++) {
145 u64 rgnbase = rgn->region[i].base;
146 u64 rgnsize = rgn->region[i].size;
147
148 if ((rgnbase == base) && (rgnsize == size))
149 /* Already have this region, so we're done */
150 return 0;
151
152 adjacent = lmb_addrs_adjacent(base, size, rgnbase, rgnsize);
153 if (adjacent > 0) {
154 rgn->region[i].base -= size;
155 rgn->region[i].size += size;
156 coalesced++;
157 break;
158 } else if (adjacent < 0) {
159 rgn->region[i].size += size;
160 coalesced++;
161 break;
162 }
163 }
164
165 if ((i < rgn->cnt - 1) && lmb_regions_adjacent(rgn, i, i+1)) {
166 lmb_coalesce_regions(rgn, i, i+1);
167 coalesced++;
168 }
169
170 if (coalesced)
171 return coalesced;
172 if (rgn->cnt >= MAX_LMB_REGIONS)
173 return -1;
174
175 /* Couldn't coalesce the LMB, so add it to the sorted table. */
176 for (i = rgn->cnt - 1; i >= 0; i--) {
177 if (base < rgn->region[i].base) {
178 rgn->region[i+1].base = rgn->region[i].base;
179 rgn->region[i+1].size = rgn->region[i].size;
180 } else {
181 rgn->region[i+1].base = base;
182 rgn->region[i+1].size = size;
183 break;
184 }
185 }
186
187 if (base < rgn->region[0].base) {
188 rgn->region[0].base = base;
189 rgn->region[0].size = size;
190 }
191 rgn->cnt++;
192
193 return 0;
194}
195
196long lmb_add(u64 base, u64 size)
197{
198 struct lmb_region *_rgn = &lmb.memory;
199
200 /* On pSeries LPAR systems, the first LMB is our RMO region. */
201 if (base == 0)
202 lmb.rmo_size = size;
203
204 return lmb_add_region(_rgn, base, size);
205
206}
207
208static long __lmb_remove(struct lmb_region *rgn, u64 base, u64 size)
209{
210 u64 rgnbegin, rgnend;
211 u64 end = base + size;
212 int i;
213
214 rgnbegin = rgnend = 0; /* supress gcc warnings */
215
216 /* Find the region where (base, size) belongs to */
217 for (i=0; i < rgn->cnt; i++) {
218 rgnbegin = rgn->region[i].base;
219 rgnend = rgnbegin + rgn->region[i].size;
220
221 if ((rgnbegin <= base) && (end <= rgnend))
222 break;
223 }
224
225 /* Didn't find the region */
226 if (i == rgn->cnt)
227 return -1;
228
229 /* Check to see if we are removing entire region */
230 if ((rgnbegin == base) && (rgnend == end)) {
231 lmb_remove_region(rgn, i);
232 return 0;
233 }
234
235 /* Check to see if region is matching at the front */
236 if (rgnbegin == base) {
237 rgn->region[i].base = end;
238 rgn->region[i].size -= size;
239 return 0;
240 }
241
242 /* Check to see if the region is matching at the end */
243 if (rgnend == end) {
244 rgn->region[i].size -= size;
245 return 0;
246 }
247
248 /*
249 * We need to split the entry - adjust the current one to the
250 * beginging of the hole and add the region after hole.
251 */
252 rgn->region[i].size = base - rgn->region[i].base;
253 return lmb_add_region(rgn, end, rgnend - end);
254}
255
256long lmb_remove(u64 base, u64 size)
257{
258 return __lmb_remove(&lmb.memory, base, size);
259}
260
261long __init lmb_free(u64 base, u64 size)
262{
263 return __lmb_remove(&lmb.reserved, base, size);
264}
265
266long __init lmb_reserve(u64 base, u64 size)
267{
268 struct lmb_region *_rgn = &lmb.reserved;
269
270 BUG_ON(0 == size);
271
272 return lmb_add_region(_rgn, base, size);
273}
274
275long lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
276{
277 unsigned long i;
278
279 for (i = 0; i < rgn->cnt; i++) {
280 u64 rgnbase = rgn->region[i].base;
281 u64 rgnsize = rgn->region[i].size;
282 if (lmb_addrs_overlap(base, size, rgnbase, rgnsize))
283 break;
284 }
285
286 return (i < rgn->cnt) ? i : -1;
287}
288
289static u64 lmb_align_down(u64 addr, u64 size)
290{
291 return addr & ~(size - 1);
292}
293
294static u64 lmb_align_up(u64 addr, u64 size)
295{
296 return (addr + (size - 1)) & ~(size - 1);
297}
298
299static u64 __init lmb_alloc_nid_unreserved(u64 start, u64 end,
300 u64 size, u64 align)
301{
302 u64 base, res_base;
303 long j;
304
305 base = lmb_align_down((end - size), align);
306 while (start <= base) {
307 j = lmb_overlaps_region(&lmb.reserved, base, size);
308 if (j < 0) {
309 /* this area isn't reserved, take it */
310 if (lmb_add_region(&lmb.reserved, base, size) < 0)
311 base = ~(u64)0;
312 return base;
313 }
314 res_base = lmb.reserved.region[j].base;
315 if (res_base < size)
316 break;
317 base = lmb_align_down(res_base - size, align);
318 }
319
320 return ~(u64)0;
321}
322
323static u64 __init lmb_alloc_nid_region(struct lmb_property *mp,
324 u64 (*nid_range)(u64, u64, int *),
325 u64 size, u64 align, int nid)
326{
327 u64 start, end;
328
329 start = mp->base;
330 end = start + mp->size;
331
332 start = lmb_align_up(start, align);
333 while (start < end) {
334 u64 this_end;
335 int this_nid;
336
337 this_end = nid_range(start, end, &this_nid);
338 if (this_nid == nid) {
339 u64 ret = lmb_alloc_nid_unreserved(start, this_end,
340 size, align);
341 if (ret != ~(u64)0)
342 return ret;
343 }
344 start = this_end;
345 }
346
347 return ~(u64)0;
348}
349
350u64 __init lmb_alloc_nid(u64 size, u64 align, int nid,
351 u64 (*nid_range)(u64 start, u64 end, int *nid))
352{
353 struct lmb_region *mem = &lmb.memory;
354 int i;
355
356 BUG_ON(0 == size);
357
358 size = lmb_align_up(size, align);
359
360 for (i = 0; i < mem->cnt; i++) {
361 u64 ret = lmb_alloc_nid_region(&mem->region[i],
362 nid_range,
363 size, align, nid);
364 if (ret != ~(u64)0)
365 return ret;
366 }
367
368 return lmb_alloc(size, align);
369}
370
371u64 __init lmb_alloc(u64 size, u64 align)
372{
373 return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
374}
375
376u64 __init lmb_alloc_base(u64 size, u64 align, u64 max_addr)
377{
378 u64 alloc;
379
380 alloc = __lmb_alloc_base(size, align, max_addr);
381
382 if (alloc == 0)
383 panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
384 (unsigned long long) size, (unsigned long long) max_addr);
385
386 return alloc;
387}
388
389u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr)
390{
391 long i, j;
392 u64 base = 0;
393 u64 res_base;
394
395 BUG_ON(0 == size);
396
397 size = lmb_align_up(size, align);
398
399 /* On some platforms, make sure we allocate lowmem */
400 /* Note that LMB_REAL_LIMIT may be LMB_ALLOC_ANYWHERE */
401 if (max_addr == LMB_ALLOC_ANYWHERE)
402 max_addr = LMB_REAL_LIMIT;
403
404 for (i = lmb.memory.cnt - 1; i >= 0; i--) {
405 u64 lmbbase = lmb.memory.region[i].base;
406 u64 lmbsize = lmb.memory.region[i].size;
407
408 if (lmbsize < size)
409 continue;
410 if (max_addr == LMB_ALLOC_ANYWHERE)
411 base = lmb_align_down(lmbbase + lmbsize - size, align);
412 else if (lmbbase < max_addr) {
413 base = min(lmbbase + lmbsize, max_addr);
414 base = lmb_align_down(base - size, align);
415 } else
416 continue;
417
418 while (base && lmbbase <= base) {
419 j = lmb_overlaps_region(&lmb.reserved, base, size);
420 if (j < 0) {
421 /* this area isn't reserved, take it */
422 if (lmb_add_region(&lmb.reserved, base, size) < 0)
423 return 0;
424 return base;
425 }
426 res_base = lmb.reserved.region[j].base;
427 if (res_base < size)
428 break;
429 base = lmb_align_down(res_base - size, align);
430 }
431 }
432 return 0;
433}
434
435/* You must call lmb_analyze() before this. */
436u64 __init lmb_phys_mem_size(void)
437{
438 return lmb.memory.size;
439}
440
441u64 lmb_end_of_DRAM(void)
442{
443 int idx = lmb.memory.cnt - 1;
444
445 return (lmb.memory.region[idx].base + lmb.memory.region[idx].size);
446}
447
448/* You must call lmb_analyze() after this. */
449void __init lmb_enforce_memory_limit(u64 memory_limit)
450{
451 unsigned long i;
452 u64 limit;
453 struct lmb_property *p;
454
455 if (!memory_limit)
456 return;
457
458 /* Truncate the lmb regions to satisfy the memory limit. */
459 limit = memory_limit;
460 for (i = 0; i < lmb.memory.cnt; i++) {
461 if (limit > lmb.memory.region[i].size) {
462 limit -= lmb.memory.region[i].size;
463 continue;
464 }
465
466 lmb.memory.region[i].size = limit;
467 lmb.memory.cnt = i + 1;
468 break;
469 }
470
471 if (lmb.memory.region[0].size < lmb.rmo_size)
472 lmb.rmo_size = lmb.memory.region[0].size;
473
474 memory_limit = lmb_end_of_DRAM();
475
476 /* And truncate any reserves above the limit also. */
477 for (i = 0; i < lmb.reserved.cnt; i++) {
478 p = &lmb.reserved.region[i];
479
480 if (p->base > memory_limit)
481 p->size = 0;
482 else if ((p->base + p->size) > memory_limit)
483 p->size = memory_limit - p->base;
484
485 if (p->size == 0) {
486 lmb_remove_region(&lmb.reserved, i);
487 i--;
488 }
489 }
490}
491
492int __init lmb_is_reserved(u64 addr)
493{
494 int i;
495
496 for (i = 0; i < lmb.reserved.cnt; i++) {
497 u64 upper = lmb.reserved.region[i].base +
498 lmb.reserved.region[i].size - 1;
499 if ((addr >= lmb.reserved.region[i].base) && (addr <= upper))
500 return 1;
501 }
502 return 0;
503}
504
505int lmb_is_region_reserved(u64 base, u64 size)
506{
507 return lmb_overlaps_region(&lmb.reserved, base, size);
508}
509
510/*
511 * Given a <base, len>, find which memory regions belong to this range.
512 * Adjust the request and return a contiguous chunk.
513 */
514int lmb_find(struct lmb_property *res)
515{
516 int i;
517 u64 rstart, rend;
518
519 rstart = res->base;
520 rend = rstart + res->size - 1;
521
522 for (i = 0; i < lmb.memory.cnt; i++) {
523 u64 start = lmb.memory.region[i].base;
524 u64 end = start + lmb.memory.region[i].size - 1;
525
526 if (start > rend)
527 return -1;
528
529 if ((end >= rstart) && (start < rend)) {
530 /* adjust the request */
531 if (rstart < start)
532 rstart = start;
533 if (rend > end)
534 rend = end;
535 res->base = rstart;
536 res->size = rend - rstart + 1;
537 return 0;
538 }
539 }
540 return -1;
541}
diff --git a/lib/rbtree.c b/lib/rbtree.c
index 15e10b1afdd2..4693f79195d3 100644
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -44,11 +44,6 @@ static void __rb_rotate_left(struct rb_node *node, struct rb_root *root)
44 else 44 else
45 root->rb_node = right; 45 root->rb_node = right;
46 rb_set_parent(node, right); 46 rb_set_parent(node, right);
47
48 if (root->augment_cb) {
49 root->augment_cb(node);
50 root->augment_cb(right);
51 }
52} 47}
53 48
54static void __rb_rotate_right(struct rb_node *node, struct rb_root *root) 49static void __rb_rotate_right(struct rb_node *node, struct rb_root *root)
@@ -72,20 +67,12 @@ static void __rb_rotate_right(struct rb_node *node, struct rb_root *root)
72 else 67 else
73 root->rb_node = left; 68 root->rb_node = left;
74 rb_set_parent(node, left); 69 rb_set_parent(node, left);
75
76 if (root->augment_cb) {
77 root->augment_cb(node);
78 root->augment_cb(left);
79 }
80} 70}
81 71
82void rb_insert_color(struct rb_node *node, struct rb_root *root) 72void rb_insert_color(struct rb_node *node, struct rb_root *root)
83{ 73{
84 struct rb_node *parent, *gparent; 74 struct rb_node *parent, *gparent;
85 75
86 if (root->augment_cb)
87 root->augment_cb(node);
88
89 while ((parent = rb_parent(node)) && rb_is_red(parent)) 76 while ((parent = rb_parent(node)) && rb_is_red(parent))
90 { 77 {
91 gparent = rb_parent(parent); 78 gparent = rb_parent(parent);
@@ -240,15 +227,12 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
240 else 227 else
241 { 228 {
242 struct rb_node *old = node, *left; 229 struct rb_node *old = node, *left;
243 int old_parent_cb = 0;
244 int successor_parent_cb = 0;
245 230
246 node = node->rb_right; 231 node = node->rb_right;
247 while ((left = node->rb_left) != NULL) 232 while ((left = node->rb_left) != NULL)
248 node = left; 233 node = left;
249 234
250 if (rb_parent(old)) { 235 if (rb_parent(old)) {
251 old_parent_cb = 1;
252 if (rb_parent(old)->rb_left == old) 236 if (rb_parent(old)->rb_left == old)
253 rb_parent(old)->rb_left = node; 237 rb_parent(old)->rb_left = node;
254 else 238 else
@@ -263,10 +247,8 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
263 if (parent == old) { 247 if (parent == old) {
264 parent = node; 248 parent = node;
265 } else { 249 } else {
266 successor_parent_cb = 1;
267 if (child) 250 if (child)
268 rb_set_parent(child, parent); 251 rb_set_parent(child, parent);
269
270 parent->rb_left = child; 252 parent->rb_left = child;
271 253
272 node->rb_right = old->rb_right; 254 node->rb_right = old->rb_right;
@@ -277,24 +259,6 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
277 node->rb_left = old->rb_left; 259 node->rb_left = old->rb_left;
278 rb_set_parent(old->rb_left, node); 260 rb_set_parent(old->rb_left, node);
279 261
280 if (root->augment_cb) {
281 /*
282 * Here, three different nodes can have new children.
283 * The parent of the successor node that was selected
284 * to replace the node to be erased.
285 * The node that is getting erased and is now replaced
286 * by its successor.
287 * The parent of the node getting erased-replaced.
288 */
289 if (successor_parent_cb)
290 root->augment_cb(parent);
291
292 root->augment_cb(node);
293
294 if (old_parent_cb)
295 root->augment_cb(rb_parent(old));
296 }
297
298 goto color; 262 goto color;
299 } 263 }
300 264
@@ -303,19 +267,15 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
303 267
304 if (child) 268 if (child)
305 rb_set_parent(child, parent); 269 rb_set_parent(child, parent);
306 270 if (parent)
307 if (parent) { 271 {
308 if (parent->rb_left == node) 272 if (parent->rb_left == node)
309 parent->rb_left = child; 273 parent->rb_left = child;
310 else 274 else
311 parent->rb_right = child; 275 parent->rb_right = child;
312
313 if (root->augment_cb)
314 root->augment_cb(parent);
315
316 } else {
317 root->rb_node = child;
318 } 276 }
277 else
278 root->rb_node = child;
319 279
320 color: 280 color:
321 if (color == RB_BLACK) 281 if (color == RB_BLACK)
@@ -323,6 +283,74 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
323} 283}
324EXPORT_SYMBOL(rb_erase); 284EXPORT_SYMBOL(rb_erase);
325 285
286static void rb_augment_path(struct rb_node *node, rb_augment_f func, void *data)
287{
288 struct rb_node *parent;
289
290up:
291 func(node, data);
292 parent = rb_parent(node);
293 if (!parent)
294 return;
295
296 if (node == parent->rb_left && parent->rb_right)
297 func(parent->rb_right, data);
298 else if (parent->rb_left)
299 func(parent->rb_left, data);
300
301 node = parent;
302 goto up;
303}
304
305/*
306 * after inserting @node into the tree, update the tree to account for
307 * both the new entry and any damage done by rebalance
308 */
309void rb_augment_insert(struct rb_node *node, rb_augment_f func, void *data)
310{
311 if (node->rb_left)
312 node = node->rb_left;
313 else if (node->rb_right)
314 node = node->rb_right;
315
316 rb_augment_path(node, func, data);
317}
318
319/*
320 * before removing the node, find the deepest node on the rebalance path
321 * that will still be there after @node gets removed
322 */
323struct rb_node *rb_augment_erase_begin(struct rb_node *node)
324{
325 struct rb_node *deepest;
326
327 if (!node->rb_right && !node->rb_left)
328 deepest = rb_parent(node);
329 else if (!node->rb_right)
330 deepest = node->rb_left;
331 else if (!node->rb_left)
332 deepest = node->rb_right;
333 else {
334 deepest = rb_next(node);
335 if (deepest->rb_right)
336 deepest = deepest->rb_right;
337 else if (rb_parent(deepest) != node)
338 deepest = rb_parent(deepest);
339 }
340
341 return deepest;
342}
343
344/*
345 * after removal, update the tree to account for the removed entry
346 * and any rebalance damage.
347 */
348void rb_augment_erase_end(struct rb_node *node, rb_augment_f func, void *data)
349{
350 if (node)
351 rb_augment_path(node, func, data);
352}
353
326/* 354/*
327 * This function returns the first node (in sort order) of the tree. 355 * This function returns the first node (in sort order) of the tree.
328 */ 356 */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-04 14:15:02 -0500