From 9ca5fbcb63a8dcaee0527f96afb91dc4b4bd8fa9 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 22 Nov 2023 01:08:11 +0000
Subject: [PATCH] add ip1811 driver
---
kernel/arch/x86/platform/efi/efi_64.c | 10 ++++------
1 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/kernel/arch/x86/platform/efi/efi_64.c b/kernel/arch/x86/platform/efi/efi_64.c
index 77d05b5..cd7e4bf 100644
--- a/kernel/arch/x86/platform/efi/efi_64.c
+++ b/kernel/arch/x86/platform/efi/efi_64.c
@@ -619,18 +619,16 @@
/*
* Makes the calling thread switch to/from efi_mm context. Can be used
- * for SetVirtualAddressMap() i.e. current->active_mm == init_mm as well
- * as during efi runtime calls i.e current->active_mm == current_mm.
- * We are not mm_dropping()/mm_grabbing() any mm, because we are not
- * losing/creating any references.
+ * in a kernel thread and user context. Preemption needs to remain disabled
+ * while the EFI-mm is borrowed. mmgrab()/mmdrop() is not used because the mm
+ * can not change under us.
+ * It should be ensured that there are no concurent calls to this function.
*/
void efi_switch_mm(struct mm_struct *mm)
{
- task_lock(current);
efi_scratch.prev_mm = current->active_mm;
current->active_mm = mm;
switch_mm(efi_scratch.prev_mm, mm, NULL);
- task_unlock(current);
}
#ifdef CONFIG_EFI_MIXED
--
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