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ANDROID: cfi: switch to synchronize_rcu_expedited()

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Use synchronize_rcu_expedited() to avoid RCU stalls when updating
the shadow while loading modules.

Bug: 178005287
Change-Id: I2a1235070bf8eb24fe4eabdc523a96c29adb04a1
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen
2021-02-08 09:23:38 -08:00
committed by Alistair Delva
parent 4bc01268f9
commit 56fec23950
1 changed files with 1 additions and 1 deletions
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2
kernel/cfi.c
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@@ -214,7 +214,7 @@ static void update_shadow(struct module *mod, unsigned long base_addr,
rcu_assign_pointer(cfi_shadow, next);
mutex_unlock(&shadow_update_lock);
synchronize_rcu();
synchronize_rcu_expedited();
if (prev) {
set_memory_rw((unsigned long)prev, SHADOW_PAGES);