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powerpc/nohash: Remove DEBUG_MAP_CONSISTENCY 

mmu_context handling has been there for years, so we
would know if there was problems with maps.

DEBUG_MAP_CONSISTENCY is not user selectable, remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6fe2b88956db53f8d6ee221525b2c5dc6aec82c6.1622712515.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-06-03 09:29:05 +00:00 коммит произвёл Michael Ellerman
Родитель c13066e53a
Коммит dac3db1edf
1 изменённых файлов: 1 добавлений и 46 удалений
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47
arch/powerpc/mm/nohash/mmu_context.c
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@ -21,7 +21,6 @@
* also clear mm->cpu_vm_mask bits when processes are migrated
*/
//#define DEBUG_MAP_CONSISTENCY
//#define DEBUG_CLAMP_LAST_CONTEXT 31
//#define DEBUG_HARDER
@ -180,9 +179,6 @@ static unsigned int steal_all_contexts(void)
if (id != FIRST_CONTEXT) {
context_mm[id] = NULL;
__clear_bit(id, context_map);
#ifdef DEBUG_MAP_CONSISTENCY
mm->context.active = 0;
#endif
}
if (IS_ENABLED(CONFIG_SMP))
__clear_bit(id, stale_map[cpu]);
@ -224,37 +220,6 @@ static unsigned int steal_context_up(unsigned int id)
return id;
}
#ifdef DEBUG_MAP_CONSISTENCY
static void context_check_map(void)
{
unsigned int id, nrf, nact;
nrf = nact = 0;
for (id = FIRST_CONTEXT; id <= LAST_CONTEXT; id++) {
int used = test_bit(id, context_map);
if (!used)
nrf++;
if (used != (context_mm[id] != NULL))
pr_err("MMU: Context %d is %s and MM is %p !\n",
id, used ? "used" : "free", context_mm[id]);
if (context_mm[id] != NULL)
nact += context_mm[id]->context.active;
}
if (nrf != nr_free_contexts) {
pr_err("MMU: Free context count out of sync ! (%d vs %d)\n",
nr_free_contexts, nrf);
nr_free_contexts = nrf;
}
if (nact > num_online_cpus())
pr_err("MMU: More active contexts than CPUs ! (%d vs %d)\n",
nact, num_online_cpus());
if (FIRST_CONTEXT > 0 && !test_bit(0, context_map))
pr_err("MMU: Context 0 has been freed !!!\n");
}
#else
static void context_check_map(void) { }
#endif
static void set_context(unsigned long id, pgd_t *pgd)
{
if (IS_ENABLED(CONFIG_PPC_8xx)) {
@ -309,14 +274,8 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
/* If we already have a valid assigned context, skip all that */
id = next->context.id;
if (likely(id != MMU_NO_CONTEXT)) {
#ifdef DEBUG_MAP_CONSISTENCY
if (context_mm[id] != next)
pr_err("MMU: mm 0x%p has id %d but context_mm[%d] says 0x%p\n",
next, id, id, context_mm[id]);
#endif
if (likely(id != MMU_NO_CONTEXT))
goto ctxt_ok;
}
/* We really don't have a context, let's try to acquire one */
id = next_context;
@ -352,7 +311,6 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
next->context.id = id;
pr_hardcont(" | new id=%d,nrf=%d", id, nr_free_contexts);
context_check_map();
ctxt_ok:
/* If that context got marked stale on this CPU, then flush the
@ -421,9 +379,6 @@ void destroy_context(struct mm_struct *mm)
if (id != MMU_NO_CONTEXT) {
__clear_bit(id, context_map);
mm->context.id = MMU_NO_CONTEXT;
#ifdef DEBUG_MAP_CONSISTENCY
mm->context.active = 0;
#endif
context_mm[id] = NULL;
nr_free_contexts++;
}