Merge tag 'efi-efivars-removal-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi
Merge commit. Changes below are compared with the first parent: 97a77ab1.
Changes
18 files changed · +781 −1762
| File | Status | Add | Del | Content |
|---|---|---|---|---|
| Documentation/x86/x86_64/uefi.rst | modified | +1 | −1 | View file |
| arch/arm/configs/milbeaut_m10v_defconfig | modified | +0 | −1 | View file |
| arch/ia64/configs/bigsur_defconfig | modified | +0 | −1 | View file |
| arch/ia64/configs/generic_defconfig | modified | +0 | −1 | View file |
| arch/ia64/configs/gensparse_defconfig | modified | +0 | −1 | View file |
| arch/ia64/configs/tiger_defconfig | modified | +0 | −1 | View file |
| arch/ia64/configs/zx1_defconfig | modified | +0 | −1 | View file |
| arch/x86/configs/i386_defconfig | modified | +0 | −1 | View file |
| arch/x86/configs/x86_64_defconfig | modified | +0 | −1 | View file |
| drivers/firmware/efi/Kconfig | modified | +0 | −12 | View file |
| drivers/firmware/efi/Makefile | modified | +0 | −1 | View file |
| drivers/firmware/efi/efi.c | modified | +1 | −0 | View file |
| drivers/firmware/efi/efivars.c | deleted | +0 | −660 | View before deletion |
| drivers/firmware/efi/vars.c | modified | +0 | −1023 | View file |
| fs/efivarfs/Makefile | modified | +1 | −1 | View file |
| fs/efivarfs/internal.h | modified | +40 | −0 | View file |
| fs/efivarfs/vars.c | added | +738 | −0 | View file |
| include/linux/efi.h | modified | +0 | −56 | View file |
Only the first 600 diff lines are shown. Download the complete patch.
Documentation/x86/x86_64/uefi.rst
View filediff --git a/Documentation/x86/x86_64/uefi.rst b/Documentation/x86/x86_64/uefi.rst
index 3b89410..fbc30c9 100644
--- a/Documentation/x86/x86_64/uefi.rst
+++ b/Documentation/x86/x86_64/uefi.rst
@@ -29,7 +29,7 @@ Mechanics
be selected::
CONFIG_EFI=y
- CONFIG_EFI_VARS=y or m # optional
+ CONFIG_EFIVAR_FS=y or m # optional
- Create a VFAT partition on the disk
- Copy the following to the VFAT partition:
arch/arm/configs/milbeaut_m10v_defconfig
View filediff --git a/arch/arm/configs/milbeaut_m10v_defconfig b/arch/arm/configs/milbeaut_m10v_defconfig
index 37739b6..58810e9 100644
--- a/arch/arm/configs/milbeaut_m10v_defconfig
+++ b/arch/arm/configs/milbeaut_m10v_defconfig
@@ -44,7 +44,6 @@ CONFIG_ARM_CPUIDLE=y
CONFIG_VFP=y
CONFIG_NEON=y
CONFIG_KERNEL_MODE_NEON=y
-CONFIG_EFI_VARS=m
CONFIG_ARM_CRYPTO=y
CONFIG_CRYPTO_SHA1_ARM_NEON=m
CONFIG_CRYPTO_SHA1_ARM_CE=m
arch/ia64/configs/bigsur_defconfig
View filediff --git a/arch/ia64/configs/bigsur_defconfig b/arch/ia64/configs/bigsur_defconfig
index 0341a67..a372488 100644
--- a/arch/ia64/configs/bigsur_defconfig
+++ b/arch/ia64/configs/bigsur_defconfig
@@ -10,7 +10,6 @@ CONFIG_SMP=y
CONFIG_NR_CPUS=2
CONFIG_PREEMPT=y
CONFIG_IA64_PALINFO=y
-CONFIG_EFI_VARS=y
CONFIG_BINFMT_MISC=m
CONFIG_ACPI_BUTTON=m
CONFIG_ACPI_FAN=m
arch/ia64/configs/generic_defconfig
View filediff --git a/arch/ia64/configs/generic_defconfig b/arch/ia64/configs/generic_defconfig
index 8916a28..a3dff48 100644
--- a/arch/ia64/configs/generic_defconfig
+++ b/arch/ia64/configs/generic_defconfig
@@ -21,7 +21,6 @@ CONFIG_IA64_MCA_RECOVERY=y
CONFIG_IA64_PALINFO=y
CONFIG_KEXEC=y
CONFIG_CRASH_DUMP=y
-CONFIG_EFI_VARS=y
CONFIG_BINFMT_MISC=m
CONFIG_ACPI_BUTTON=m
CONFIG_ACPI_FAN=m
arch/ia64/configs/gensparse_defconfig
View filediff --git a/arch/ia64/configs/gensparse_defconfig b/arch/ia64/configs/gensparse_defconfig
index 281eb9c..4cd4610 100644
--- a/arch/ia64/configs/gensparse_defconfig
+++ b/arch/ia64/configs/gensparse_defconfig
@@ -18,7 +18,6 @@ CONFIG_HOTPLUG_CPU=y
CONFIG_SPARSEMEM_MANUAL=y
CONFIG_IA64_MCA_RECOVERY=y
CONFIG_IA64_PALINFO=y
-CONFIG_EFI_VARS=y
CONFIG_BINFMT_MISC=m
CONFIG_ACPI_BUTTON=m
CONFIG_ACPI_FAN=m
arch/ia64/configs/tiger_defconfig
View filediff --git a/arch/ia64/configs/tiger_defconfig b/arch/ia64/configs/tiger_defconfig
index b4f9819..a2045d7 100644
--- a/arch/ia64/configs/tiger_defconfig
+++ b/arch/ia64/configs/tiger_defconfig
@@ -23,7 +23,6 @@ CONFIG_FORCE_CPEI_RETARGET=y
CONFIG_IA64_MCA_RECOVERY=y
CONFIG_IA64_PALINFO=y
CONFIG_KEXEC=y
-CONFIG_EFI_VARS=y
CONFIG_BINFMT_MISC=m
CONFIG_ACPI_BUTTON=m
CONFIG_ACPI_FAN=m
arch/ia64/configs/zx1_defconfig
View filediff --git a/arch/ia64/configs/zx1_defconfig b/arch/ia64/configs/zx1_defconfig
index 851d859..99f8b2a 100644
--- a/arch/ia64/configs/zx1_defconfig
+++ b/arch/ia64/configs/zx1_defconfig
@@ -12,7 +12,6 @@ CONFIG_FLATMEM_MANUAL=y
CONFIG_IA64_MCA_RECOVERY=y
CONFIG_IA64_PALINFO=y
CONFIG_CRASH_DUMP=y
-CONFIG_EFI_VARS=y
CONFIG_BINFMT_MISC=y
CONFIG_HOTPLUG_PCI=y
CONFIG_HOTPLUG_PCI_ACPI=y
arch/x86/configs/i386_defconfig
View filediff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig
index 98a4852..7207219 100644
--- a/arch/x86/configs/i386_defconfig
+++ b/arch/x86/configs/i386_defconfig
@@ -135,7 +135,6 @@ CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_DEBUG_DEVRES=y
CONFIG_CONNECTOR=y
-CONFIG_EFI_VARS=y
CONFIG_EFI_CAPSULE_LOADER=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_VIRTIO_BLK=y
arch/x86/configs/x86_64_defconfig
View filediff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig
index 6978450..5ce67b7 100644
--- a/arch/x86/configs/x86_64_defconfig
+++ b/arch/x86/configs/x86_64_defconfig
@@ -134,7 +134,6 @@ CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_DEBUG_DEVRES=y
CONFIG_CONNECTOR=y
-CONFIG_EFI_VARS=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_VIRTIO_BLK=y
CONFIG_BLK_DEV_SD=y
drivers/firmware/efi/Kconfig
View filediff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index 7fe8b5c..6cb7384 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -2,18 +2,6 @@
menu "EFI (Extensible Firmware Interface) Support"
depends on EFI
-config EFI_VARS
- tristate "EFI Variable Support via sysfs"
- depends on EFI && (X86 || IA64)
- default n
- help
- If you say Y here, you are able to get EFI (Extensible Firmware
- Interface) variable information via sysfs. You may read,
- write, create, and destroy EFI variables through this interface.
- Note that this driver is only retained for compatibility with
- legacy users: new users should use the efivarfs filesystem
- instead.
-
config EFI_ESRT
bool
depends on EFI && !IA64
drivers/firmware/efi/Makefile
View filediff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index c02ff25..8d151e3 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -17,7 +17,6 @@ ifneq ($(CONFIG_EFI_CAPSULE_LOADER),)
obj-$(CONFIG_EFI) += capsule.o
endif
obj-$(CONFIG_EFI_PARAMS_FROM_FDT) += fdtparams.o
-obj-$(CONFIG_EFI_VARS) += efivars.o
obj-$(CONFIG_EFI_ESRT) += esrt.o
obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
obj-$(CONFIG_UEFI_CPER) += cper.o
drivers/firmware/efi/efi.c
View filediff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 7f06065..e4080ad 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -899,6 +899,7 @@ int efi_status_to_err(efi_status_t status)
return err;
}
+EXPORT_SYMBOL_GPL(efi_status_to_err);
static DEFINE_SPINLOCK(efi_mem_reserve_persistent_lock);
static struct linux_efi_memreserve *efi_memreserve_root __ro_after_init;
drivers/firmware/efi/efivars.c
View before deletiondiff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
deleted file mode 100644
index 801a655..0000000
--- a/drivers/firmware/efi/efivars.c
+++ /dev/null
@@ -1,660 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Originally from efivars.c,
- *
- * Copyright (C) 2001,2003,2004 Dell <[email protected]>
- * Copyright (C) 2004 Intel Corporation <[email protected]>
- *
- * This code takes all variables accessible from EFI runtime and
- * exports them via sysfs
- */
-
-#include <linux/efi.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/ucs2_string.h>
-#include <linux/compat.h>
-
-#define EFIVARS_VERSION "0.08"
-#define EFIVARS_DATE "2004-May-17"
-
-MODULE_AUTHOR("Matt Domsch <[email protected]>");
-MODULE_DESCRIPTION("sysfs interface to EFI Variables");
-MODULE_LICENSE("GPL");
-MODULE_VERSION(EFIVARS_VERSION);
-
-static LIST_HEAD(efivar_sysfs_list);
-
-static struct kset *efivars_kset;
-
-static struct bin_attribute *efivars_new_var;
-static struct bin_attribute *efivars_del_var;
-
-struct compat_efi_variable {
- efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];
- efi_guid_t VendorGuid;
- __u32 DataSize;
- __u8 Data[1024];
- __u32 Status;
- __u32 Attributes;
-} __packed;
-
-struct efivar_attribute {
- struct attribute attr;
- ssize_t (*show) (struct efivar_entry *entry, char *buf);
- ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count);
-};
-
-#define EFIVAR_ATTR(_name, _mode, _show, _store) \
-struct efivar_attribute efivar_attr_##_name = { \
- .attr = {.name = __stringify(_name), .mode = _mode}, \
- .show = _show, \
- .store = _store, \
-};
-
-#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr)
-#define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj)
-
-/*
- * Prototype for sysfs creation function
- */
-static int
-efivar_create_sysfs_entry(struct efivar_entry *new_var);
-
-static ssize_t
-efivar_guid_read(struct efivar_entry *entry, char *buf)
-{
- struct efi_variable *var = &entry->var;
- char *str = buf;
-
- if (!entry || !buf)
- return 0;
-
- efi_guid_to_str(&var->VendorGuid, str);
- str += strlen(str);
- str += sprintf(str, "\n");
-
- return str - buf;
-}
-
-static ssize_t
-efivar_attr_read(struct efivar_entry *entry, char *buf)
-{
- struct efi_variable *var = &entry->var;
- unsigned long size = sizeof(var->Data);
- char *str = buf;
- int ret;
-
- if (!entry || !buf)
- return -EINVAL;
-
- ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
- var->DataSize = size;
- if (ret)
- return -EIO;
-
- if (var->Attributes & EFI_VARIABLE_NON_VOLATILE)
- str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n");
- if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS)
- str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n");
- if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS)
- str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n");
- if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD)
- str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n");
- if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS)
- str += sprintf(str,
- "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n");
- if (var->Attributes &
- EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)
- str += sprintf(str,
- "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n");
- if (var->Attributes & EFI_VARIABLE_APPEND_WRITE)
- str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n");
- return str - buf;
-}
-
-static ssize_t
-efivar_size_read(struct efivar_entry *entry, char *buf)
-{
- struct efi_variable *var = &entry->var;
- unsigned long size = sizeof(var->Data);
- char *str = buf;
- int ret;
-
- if (!entry || !buf)
- return -EINVAL;
-
- ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
- var->DataSize = size;
- if (ret)
- return -EIO;
-
- str += sprintf(str, "0x%lx\n", var->DataSize);
- return str - buf;
-}
-
-static ssize_t
-efivar_data_read(struct efivar_entry *entry, char *buf)
-{
- struct efi_variable *var = &entry->var;
- unsigned long size = sizeof(var->Data);
- int ret;
-
- if (!entry || !buf)
- return -EINVAL;
-
- ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
- var->DataSize = size;
- if (ret)
- return -EIO;
-
- memcpy(buf, var->Data, var->DataSize);
- return var->DataSize;
-}
-
-static inline int
-sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor,
- unsigned long size, u32 attributes, u8 *data)
-{
- /*
- * If only updating the variable data, then the name
- * and guid should remain the same
- */
- if (memcmp(name, var->VariableName, sizeof(var->VariableName)) ||
- efi_guidcmp(vendor, var->VendorGuid)) {
- printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
- return -EINVAL;
- }
-
- if ((size <= 0) || (attributes == 0)){
- printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
- return -EINVAL;
- }
-
- if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
- efivar_validate(vendor, name, data, size) == false) {
- printk(KERN_ERR "efivars: Malformed variable content\n");
- return -EINVAL;
- }
-
- return 0;
-}
-
-static void
-copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src)
-{
- memcpy(dst->VariableName, src->VariableName, EFI_VAR_NAME_LEN);
- memcpy(dst->Data, src->Data, sizeof(src->Data));
-
- dst->VendorGuid = src->VendorGuid;
- dst->DataSize = src->DataSize;
- dst->Attributes = src->Attributes;
-}
-
-/*
- * We allow each variable to be edited via rewriting the
- * entire efi variable structure.
- */
-static ssize_t
-efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
-{
- struct efi_variable *new_var, *var = &entry->var;
- efi_char16_t *name;
- unsigned long size;
- efi_guid_t vendor;
- u32 attributes;
- u8 *data;
- int err;
-
- if (!entry || !buf)
- return -EINVAL;
-
- if (in_compat_syscall()) {
- struct compat_efi_variable *compat;
-
- if (count != sizeof(*compat))
- return -EINVAL;
-
- compat = (struct compat_efi_variable *)buf;
- attributes = compat->Attributes;
- vendor = compat->VendorGuid;
- name = compat->VariableName;
- size = compat->DataSize;
- data = compat->Data;
-
- err = sanity_check(var, name, vendor, size, attributes, data);
- if (err)
- return err;
-
- copy_out_compat(&entry->var, compat);
- } else {
- if (count != sizeof(struct efi_variable))
- return -EINVAL;
-
- new_var = (struct efi_variable *)buf;
-
- attributes = new_var->Attributes;
- vendor = new_var->VendorGuid;
- name = new_var->VariableName;
- size = new_var->DataSize;
- data = new_var->Data;
-
- err = sanity_check(var, name, vendor, size, attributes, data);
- if (err)
- return err;
-
- memcpy(&entry->var, new_var, count);
- }
-
- err = efivar_entry_set(entry, attributes, size, data, NULL);
- if (err) {
- printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err);
- return -EIO;
- }
-
- return count;
-}
-
-static ssize_t
-efivar_show_raw(struct efivar_entry *entry, char *buf)
-{
- struct efi_variable *var = &entry->var;
- struct compat_efi_variable *compat;
- unsigned long datasize = sizeof(var->Data);
- size_t size;
- int ret;
-
- if (!entry || !buf)
- return 0;
-
- ret = efivar_entry_get(entry, &var->Attributes, &datasize, var->Data);
- var->DataSize = datasize;
- if (ret)
- return -EIO;
-
- if (in_compat_syscall()) {
- compat = (struct compat_efi_variable *)buf;
-
- size = sizeof(*compat);
- memcpy(compat->VariableName, var->VariableName,
- EFI_VAR_NAME_LEN);
- memcpy(compat->Data, var->Data, sizeof(compat->Data));
-
- compat->VendorGuid = var->VendorGuid;
- compat->DataSize = var->DataSize;
- compat->Attributes = var->Attributes;
- } else {
- size = sizeof(*var);
- memcpy(buf, var, size);
- }
-
- return size;
-}
-
-/*
- * Generic read/write functions that call the specific functions of
- * the attributes...
- */
-static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- struct efivar_entry *var = to_efivar_entry(kobj);
- struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
- ssize_t ret = -EIO;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
-
- if (efivar_attr->show) {
- ret = efivar_attr->show(var, buf);
- }
- return ret;
-}
-
-static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr,
- const char *buf, size_t count)
-{
- struct efivar_entry *var = to_efivar_entry(kobj);
- struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
- ssize_t ret = -EIO;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
-
- if (efivar_attr->store)
- ret = efivar_attr->store(var, buf, count);
-
- return ret;
-}
-
-static const struct sysfs_ops efivar_attr_ops = {
- .show = efivar_attr_show,
- .store = efivar_attr_store,
-};
-
-static void efivar_release(struct kobject *kobj)
-{
- struct efivar_entry *var = to_efivar_entry(kobj);
- kfree(var);
-}
-
-static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL);
-static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL);
-static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL);
-static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL);
-static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw);
-
-static struct attribute *def_attrs[] = {
- &efivar_attr_guid.attr,
- &efivar_attr_size.attr,
- &efivar_attr_attributes.attr,
- &efivar_attr_data.attr,
- &efivar_attr_raw_var.attr,
- NULL,
-};
-ATTRIBUTE_GROUPS(def);
-
-static struct kobj_type efivar_ktype = {
- .release = efivar_release,
- .sysfs_ops = &efivar_attr_ops,
- .default_groups = def_groups,
-};
-
-static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t pos, size_t count)
-{
- struct compat_efi_variable *compat = (struct compat_efi_variable *)buf;
- struct efi_variable *new_var = (struct efi_variable *)buf;
- struct efivar_entry *new_entry;
- bool need_compat = in_compat_syscall();
- efi_char16_t *name;
- unsigned long size;
- u32 attributes;
- u8 *data;
- int err;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
-
- if (need_compat) {
- if (count != sizeof(*compat))
- return -EINVAL;
-
- attributes = compat->Attributes;
- name = compat->VariableName;
- size = compat->DataSize;
- data = compat->Data;
- } else {
- if (count != sizeof(*new_var))
- return -EINVAL;
-
- attributes = new_var->Attributes;
- name = new_var->VariableName;
- size = new_var->DataSize;
- data = new_var->Data;
- }
-
- if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
- efivar_validate(new_var->VendorGuid, name, data,
- size) == false) {
- printk(KERN_ERR "efivars: Malformed variable content\n");
- return -EINVAL;
- }
-
- new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL);
- if (!new_entry)
- return -ENOMEM;
-
- if (need_compat)
- copy_out_compat(&new_entry->var, compat);
- else
- memcpy(&new_entry->var, new_var, sizeof(*new_var));
-
- err = efivar_entry_set(new_entry, attributes, size,
- data, &efivar_sysfs_list);
- if (err) {
- if (err == -EEXIST)
- err = -EINVAL;
- goto out;
- }
-
- if (efivar_create_sysfs_entry(new_entry)) {
- printk(KERN_WARNING "efivars: failed to create sysfs entry.\n");
- kfree(new_entry);
- }
- return count;
-
-out:
- kfree(new_entry);
- return err;
-}
-
-static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t pos, size_t count)
-{
- struct efi_variable *del_var = (struct efi_variable *)buf;
- struct compat_efi_variable *compat;
This diff is incomplete. Download the complete patch.
drivers/firmware/efi/vars.c
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fs/efivarfs/Makefile
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fs/efivarfs/internal.h
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fs/efivarfs/vars.c
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include/linux/efi.h
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