| slb.c (651a88798412e216f337d70181127e847f00a4b7) | slb.c (1fd02f6605b855b4af2883f29a2abc88bdf17857) |
|---|---|
| 1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * PowerPC64 SLB support. 4 * 5 * Copyright (C) 2004 David Gibson <dwg@au.ibm.com>, IBM 6 * Based on earlier code written by: 7 * Dave Engebretsen and Mike Corrigan {engebret|mikejc}@us.ibm.com 8 * Copyright (c) 2001 Dave Engebretsen --- 333 unchanged lines hidden (view full) --- 342 if (ti->slb_preload_nr + 2 > SLB_PRELOAD_NR) 343 return; 344 345 hard_irq_disable(); 346 347 /* 348 * We have no good place to clear the slb preload cache on exec, 349 * flush_thread is about the earliest arch hook but that happens | 1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * PowerPC64 SLB support. 4 * 5 * Copyright (C) 2004 David Gibson <dwg@au.ibm.com>, IBM 6 * Based on earlier code written by: 7 * Dave Engebretsen and Mike Corrigan {engebret|mikejc}@us.ibm.com 8 * Copyright (c) 2001 Dave Engebretsen --- 333 unchanged lines hidden (view full) --- 342 if (ti->slb_preload_nr + 2 > SLB_PRELOAD_NR) 343 return; 344 345 hard_irq_disable(); 346 347 /* 348 * We have no good place to clear the slb preload cache on exec, 349 * flush_thread is about the earliest arch hook but that happens |
| 350 * after we switch to the mm and have aleady preloaded the SLBEs. | 350 * after we switch to the mm and have already preloaded the SLBEs. |
| 351 * 352 * For the most part that's probably okay to use entries from the 353 * previous exec, they will age out if unused. It may turn out to 354 * be an advantage to clear the cache before switching to it, 355 * however. 356 */ 357 358 /* --- 251 unchanged lines hidden (view full) --- 610 * We have space in slb cache for optimized switch_slb(). 611 * Top 36 bits from esid_data as per ISA 612 */ 613 local_paca->slb_cache[slb_cache_index++] = esid_data >> SID_SHIFT; 614 local_paca->slb_cache_ptr++; 615 } else { 616 /* 617 * Our cache is full and the current cache content strictly | 351 * 352 * For the most part that's probably okay to use entries from the 353 * previous exec, they will age out if unused. It may turn out to 354 * be an advantage to clear the cache before switching to it, 355 * however. 356 */ 357 358 /* --- 251 unchanged lines hidden (view full) --- 610 * We have space in slb cache for optimized switch_slb(). 611 * Top 36 bits from esid_data as per ISA 612 */ 613 local_paca->slb_cache[slb_cache_index++] = esid_data >> SID_SHIFT; 614 local_paca->slb_cache_ptr++; 615 } else { 616 /* 617 * Our cache is full and the current cache content strictly |
| 618 * doesn't indicate the active SLB conents. Bump the ptr | 618 * doesn't indicate the active SLB contents. Bump the ptr |
| 619 * so that switch_slb() will ignore the cache. 620 */ 621 local_paca->slb_cache_ptr = SLB_CACHE_ENTRIES + 1; 622 } 623} 624 625static enum slb_index alloc_slb_index(bool kernel) 626{ --- 243 unchanged lines hidden --- | 619 * so that switch_slb() will ignore the cache. 620 */ 621 local_paca->slb_cache_ptr = SLB_CACHE_ENTRIES + 1; 622 } 623} 624 625static enum slb_index alloc_slb_index(bool kernel) 626{ --- 243 unchanged lines hidden --- |