On 18 January 2017 at 19:24, Bhupesh Sharma <bhsharma@xxxxxxxxxx> wrote:
> On Wed, Jan 18, 2017 at 7:30 PM, Ard Biesheuvel
> <ard.biesheuvel@xxxxxxxxxx> wrote:
>> On 18 January 2017 at 13:48, Dave Young <dyoung@xxxxxxxxxx> wrote:
>>> Before invoking the arch specific handler, efi_mem_reserve() reserves
>>> the given memory region through memblock.
>>>
>>> efi_bgrt_init will call efi_mem_reserve after mm_init(), at that time
>>> memblock is dead and it should not be used any more.
>>>
>>> efi bgrt code depend on acpi intialization to get the bgrt acpi table,
>>> moving bgrt parsing to acpi early boot code can make sure efi_mem_reserve
>>> in efi bgrt code still use memblock safely.
>>>
>>> Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
>>
>> This patch looks fine to me know
>>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
>>
>> but before applying it, I'd like
>>
>> - Bhupesh to confirm that this patch is a move in the right direction
>> with regard to enabling BGRT on arm64/ACPI,
>
> I gave the changes from Dave a try on top of the following combination:
> 4.10-rc3 + efi/next patches not available in 4.10-rc3 + Nicolai's patches
>
> and was able to get the BGRT table working properly with OVMF on a
> QEMU-x86_64 machine. So you can add my tested-by for this patch
> series.
>
> I think this is the right direction for the ARM64 BGRT handling
> patches as well and I will post a RFC in two phases as suggested by
> Ard, once Dave's patches are accepted (in efi/next?).
>
Thanks!
>
>> - an ack from the ACPI maintainers (cc'ed)
>>
Rafael, Len? Any objections?
If not, I will go ahead and queue this for v4.11
>>> --->>> v1->v2: efi_bgrt_init: check table length first before copying bgrt table
>>> error checking in drivers/acpi/bgrt.c
>>> v2->v3: drop #ifdef added before; efi-bgrt.h build warning fix
>>> since only changed this patch, so I just only resend this one.
>>> arch/x86/kernel/acpi/boot.c | 9 +++++
>>> arch/x86/platform/efi/efi-bgrt.c | 59 ++++++++++++++++-----------------------
>>> arch/x86/platform/efi/efi.c | 5 ---
>>> drivers/acpi/bgrt.c | 28 +++++++++++++-----
>>> include/linux/efi-bgrt.h | 11 +++----
>>> init/main.c | 1
>>> 6 files changed, 59 insertions(+), 54 deletions(-)
>>>
>>> --- linux-x86.orig/arch/x86/kernel/acpi/boot.c
>>> +++ linux-x86/arch/x86/kernel/acpi/boot.c
>>> @@ -35,6 +35,7 @@
>>> #include <linux/bootmem.h>
>>> #include <linux/ioport.h>
>>> #include <linux/pci.h>
>>> +#include <linux/efi-bgrt.h>
>>>
>>> #include <asm/irqdomain.h>
>>> #include <asm/pci_x86.h>
>>> @@ -1557,6 +1558,12 @@ int __init early_acpi_boot_init(void)
>>> return 0;
>>> }
>>>
>>> +static int __init acpi_parse_bgrt(struct acpi_table_header *table)
>>> +{
>>> + efi_bgrt_init(table);
>>> + return 0;
>>> +}
>>> +
>>> int __init acpi_boot_init(void)
>>> {
>>> /* those are executed after early-quirks are executed */
>>> @@ -1581,6 +1588,8 @@ int __init acpi_boot_init(void)
>>> acpi_process_madt();
>>>
>>> acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
>>> + if (IS_ENABLED(CONFIG_ACPI_BGRT))
>>> + acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
>>>
>>> if (!acpi_noirq)
>>> x86_init.pci.init = pci_acpi_init;
>>> --- linux-x86.orig/arch/x86/platform/efi/efi-bgrt.c
>>> +++ linux-x86/arch/x86/platform/efi/efi-bgrt.c
>>> @@ -19,8 +19,7 @@
>>> #include <linux/efi.h>
>>> #include <linux/efi-bgrt.h>
>>>
>>> -struct acpi_table_bgrt *bgrt_tab;
>>> -void *__initdata bgrt_image;
>>> +struct acpi_table_bgrt bgrt_tab;
>>> size_t __initdata bgrt_image_size;
>>>
>>> struct bmp_header {
>>> @@ -28,66 +27,58 @@ struct bmp_header {
>>> u32 size;
>>> } __packed;
>>>
>>> -void __init efi_bgrt_init(void)
>>> +void __init efi_bgrt_init(struct acpi_table_header *table)
>>> {
>>> - acpi_status status;
>>> void *image;
>>> struct bmp_header bmp_header;
>>> + struct acpi_table_bgrt *bgrt = &bgrt_tab;
>>>
>>> if (acpi_disabled)
>>> return;
>>>
>>> - status = acpi_get_table("BGRT", 0,
>>> - (struct acpi_table_header **)&bgrt_tab);
>>> - if (ACPI_FAILURE(status))
>>> - return;
>>> -
>>> - if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
>>> + if (table->length < sizeof(bgrt_tab)) {
>>> pr_notice("Ignoring BGRT: invalid length %u (expected %zu)\n",
>>> - bgrt_tab->header.length, sizeof(*bgrt_tab));
>>> + table->length, sizeof(bgrt_tab));
>>> return;
>>> }
>>> - if (bgrt_tab->version != 1) {
>>> + *bgrt = *(struct acpi_table_bgrt *)table;
>>> + if (bgrt->version != 1) {
>>> pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
>>> - bgrt_tab->version);
>>> - return;
>>> + bgrt->version);
>>> + goto out;
>>> }
>>> - if (bgrt_tab->status & 0xfe) {
>>> + if (bgrt->status & 0xfe) {
>>> pr_notice("Ignoring BGRT: reserved status bits are non-zero %u\n",
>>> - bgrt_tab->status);
>>> - return;
>>> + bgrt->status);
>>> + goto out;
>>> }
>>> - if (bgrt_tab->image_type != 0) {
>>> + if (bgrt->image_type != 0) {
>>> pr_notice("Ignoring BGRT: invalid image type %u (expected 0)\n",
>>> - bgrt_tab->image_type);
>>> - return;
>>> + bgrt->image_type);
>>> + goto out;
>>> }
>>> - if (!bgrt_tab->image_address) {
>>> + if (!bgrt->image_address) {
>>> pr_notice("Ignoring BGRT: null image address\n");
>>> - return;
>>> + goto out;
>>> }
>>>
>>> - image = memremap(bgrt_tab->image_address, sizeof(bmp_header), MEMREMAP_WB);
>>> + image = early_memremap(bgrt->image_address, sizeof(bmp_header));
>>> if (!image) {
>>> pr_notice("Ignoring BGRT: failed to map image header memory\n");
>>> - return;
>>> + goto out;
>>> }
>>>
>>> memcpy(&bmp_header, image, sizeof(bmp_header));
>>> - memunmap(image);
>>> + early_memunmap(image, sizeof(bmp_header));
>>> if (bmp_header.id != 0x4d42) {
>>> pr_notice("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
>>> bmp_header.id);
>>> - return;
>>> + goto out;
>>> }
>>> bgrt_image_size = bmp_header.size;
>>> + efi_mem_reserve(bgrt->image_address, bgrt_image_size);
>>>
>>> - bgrt_image = memremap(bgrt_tab->image_address, bmp_header.size, MEMREMAP_WB);
>>> - if (!bgrt_image) {
>>> - pr_notice("Ignoring BGRT: failed to map image memory\n");
>>> - bgrt_image = NULL;
>>> - return;
>>> - }
>>> -
>>> - efi_mem_reserve(bgrt_tab->image_address, bgrt_image_size);
>>> + return;
>>> +out:
>>> + memset(bgrt, 0, sizeof(bgrt_tab));
>>> }
>>> --- linux-x86.orig/drivers/acpi/bgrt.c
>>> +++ linux-x86/drivers/acpi/bgrt.c
>>> @@ -15,40 +15,41 @@
>>> #include <linux/sysfs.h>
>>> #include <linux/efi-bgrt.h>
>>>
>>> +static void *bgrt_image;
>>> static struct kobject *bgrt_kobj;
>>>
>>> static ssize_t show_version(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version);
>>> }
>>> static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
>>>
>>> static ssize_t show_status(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status);
>>> }
>>> static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
>>>
>>> static ssize_t show_type(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type);
>>> }
>>> static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
>>>
>>> static ssize_t show_xoffset(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x);
>>> }
>>> static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
>>>
>>> static ssize_t show_yoffset(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y);
>>> }
>>> static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
>>>
>>> @@ -84,15 +85,24 @@ static int __init bgrt_init(void)
>>> {
>>> int ret;
>>>
>>> - if (!bgrt_image)
>>> + if (!bgrt_tab.image_address)
>>> return -ENODEV;
>>>
>>> + bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
>>> + MEMREMAP_WB);
>>> + if (!bgrt_image) {
>>> + pr_notice("Ignoring BGRT: failed to map image memory\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> bin_attr_image.private = bgrt_image;
>>> bin_attr_image.size = bgrt_image_size;
>>>
>>> bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
>>> - if (!bgrt_kobj)
>>> - return -EINVAL;
>>> + if (!bgrt_kobj) {
>>> + ret = -EINVAL;
>>> + goto out_memmap;
>>> + }
>>>
>>> ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
>>> if (ret)
>>> @@ -102,6 +112,8 @@ static int __init bgrt_init(void)
>>>
>>> out_kobject:
>>> kobject_put(bgrt_kobj);
>>> +out_memmap:
>>> + memunmap(bgrt_image);
>>> return ret;
>>> }
>>> device_initcall(bgrt_init);
>>> --- linux-x86.orig/include/linux/efi-bgrt.h
>>> +++ linux-x86/include/linux/efi-bgrt.h
>>> @@ -1,20 +1,19 @@
>>> #ifndef _LINUX_EFI_BGRT_H
>>> #define _LINUX_EFI_BGRT_H
>>>
>>> -#ifdef CONFIG_ACPI_BGRT
>>> -
>>> #include <linux/acpi.h>
>>>
>>> -void efi_bgrt_init(void);
>>> +#ifdef CONFIG_ACPI_BGRT
>>> +
>>> +void efi_bgrt_init(struct acpi_table_header *table);
>>>
>>> /* The BGRT data itself; only valid if bgrt_image != NULL. */
>>> -extern void *bgrt_image;
>>> extern size_t bgrt_image_size;
>>> -extern struct acpi_table_bgrt *bgrt_tab;
>>> +extern struct acpi_table_bgrt bgrt_tab;
>>>
>>> #else /* !CONFIG_ACPI_BGRT */
>>>
>>> -static inline void efi_bgrt_init(void) {}
>>> +static inline void efi_bgrt_init(struct acpi_table_header *table) {}
>>>
>>> #endif /* !CONFIG_ACPI_BGRT */
>>>
>>> --- linux-x86.orig/arch/x86/platform/efi/efi.c
>>> +++ linux-x86/arch/x86/platform/efi/efi.c
>>> @@ -542,11 +542,6 @@ void __init efi_init(void)
>>> efi_print_memmap();
>>> }
>>>
>>> -void __init efi_late_init(void)
>>> -{
>>> - efi_bgrt_init();
>>> -}
>>> -
>>> void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
>>> {
>>> u64 addr, npages;
>>> --- linux-x86.orig/init/main.c
>>> +++ linux-x86/init/main.c
>>> @@ -663,7 +663,6 @@ asmlinkage __visible void __init start_k
>>> sfi_init_late();
>>>
>>> if (efi_enabled(EFI_RUNTIME_SERVICES)) {
>>> - efi_late_init();
>>> efi_free_boot_services();
>>> }
>>>
>> - an ack from the ACPI maintainers (cc'ed)
>>
>> Thanks,
>> Ard.
>>
>>
>>> ---
>>> v1->v2: efi_bgrt_init: check table length first before copying bgrt table
>>> error checking in drivers/acpi/bgrt.c
>>> v2->v3: drop #ifdef added before; efi-bgrt.h build warning fix
>>> since only changed this patch, so I just only resend this one.
>>> arch/x86/kernel/acpi/boot.c | 9 +++++
>>> arch/x86/platform/efi/efi-bgrt.c | 59 ++++++++++++++++-----------------------
>>> arch/x86/platform/efi/efi.c | 5 ---
>>> drivers/acpi/bgrt.c | 28 +++++++++++++-----
>>> include/linux/efi-bgrt.h | 11 +++----
>>> init/main.c | 1
>>> 6 files changed, 59 insertions(+), 54 deletions(-)
>>>
>>> --- linux-x86.orig/arch/x86/kernel/acpi/boot.c
>>> +++ linux-x86/arch/x86/kernel/acpi/boot.c
>>> @@ -35,6 +35,7 @@
>>> #include <linux/bootmem.h>
>>> #include <linux/ioport.h>
>>> #include <linux/pci.h>
>>> +#include <linux/efi-bgrt.h>
>>>
>>> #include <asm/irqdomain.h>
>>> #include <asm/pci_x86.h>
>>> @@ -1557,6 +1558,12 @@ int __init early_acpi_boot_init(void)
>>> return 0;
>>> }
>>>
>>> +static int __init acpi_parse_bgrt(struct acpi_table_header *table)
>>> +{
>>> + efi_bgrt_init(table);
>>> + return 0;
>>> +}
>>> +
>>> int __init acpi_boot_init(void)
>>> {
>>> /* those are executed after early-quirks are executed */
>>> @@ -1581,6 +1588,8 @@ int __init acpi_boot_init(void)
>>> acpi_process_madt();
>>>
>>> acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
>>> + if (IS_ENABLED(CONFIG_ACPI_BGRT))
>>> + acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
>>>
>>> if (!acpi_noirq)
>>> x86_init.pci.init = pci_acpi_init;
>>> --- linux-x86.orig/arch/x86/platform/efi/efi-bgrt.c
>>> +++ linux-x86/arch/x86/platform/efi/efi-bgrt.c
>>> @@ -19,8 +19,7 @@
>>> #include <linux/efi.h>
>>> #include <linux/efi-bgrt.h>
>>>
>>> -struct acpi_table_bgrt *bgrt_tab;
>>> -void *__initdata bgrt_image;
>>> +struct acpi_table_bgrt bgrt_tab;
>>> size_t __initdata bgrt_image_size;
>>>
>>> struct bmp_header {
>>> @@ -28,66 +27,58 @@ struct bmp_header {
>>> u32 size;
>>> } __packed;
>>>
>>> -void __init efi_bgrt_init(void)
>>> +void __init efi_bgrt_init(struct acpi_table_header *table)
>>> {
>>> - acpi_status status;
>>> void *image;
>>> struct bmp_header bmp_header;
>>> + struct acpi_table_bgrt *bgrt = &bgrt_tab;
>>>
>>> if (acpi_disabled)
>>> return;
>>>
>>> - status = acpi_get_table("BGRT", 0,
>>> - (struct acpi_table_header **)&bgrt_tab);
>>> - if (ACPI_FAILURE(status))
>>> - return;
>>> -
>>> - if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
>>> + if (table->length < sizeof(bgrt_tab)) {
>>> pr_notice("Ignoring BGRT: invalid length %u (expected %zu)\n",
>>> - bgrt_tab->header.length, sizeof(*bgrt_tab));
>>> + table->length, sizeof(bgrt_tab));
>>> return;
>>> }
>>> - if (bgrt_tab->version != 1) {
>>> + *bgrt = *(struct acpi_table_bgrt *)table;
>>> + if (bgrt->version != 1) {
>>> pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
>>> - bgrt_tab->version);
>>> - return;
>>> + bgrt->version);
>>> + goto out;
>>> }
>>> - if (bgrt_tab->status & 0xfe) {
>>> + if (bgrt->status & 0xfe) {
>>> pr_notice("Ignoring BGRT: reserved status bits are non-zero %u\n",
>>> - bgrt_tab->status);
>>> - return;
>>> + bgrt->status);
>>> + goto out;
>>> }
>>> - if (bgrt_tab->image_type != 0) {
>>> + if (bgrt->image_type != 0) {
>>> pr_notice("Ignoring BGRT: invalid image type %u (expected 0)\n",
>>> - bgrt_tab->image_type);
>>> - return;
>>> + bgrt->image_type);
>>> + goto out;
>>> }
>>> - if (!bgrt_tab->image_address) {
>>> + if (!bgrt->image_address) {
>>> pr_notice("Ignoring BGRT: null image address\n");
>>> - return;
>>> + goto out;
>>> }
>>>
>>> - image = memremap(bgrt_tab->image_address, sizeof(bmp_header), MEMREMAP_WB);
>>> + image = early_memremap(bgrt->image_address, sizeof(bmp_header));
>>> if (!image) {
>>> pr_notice("Ignoring BGRT: failed to map image header memory\n");
>>> - return;
>>> + goto out;
>>> }
>>>
>>> memcpy(&bmp_header, image, sizeof(bmp_header));
>>> - memunmap(image);
>>> + early_memunmap(image, sizeof(bmp_header));
>>> if (bmp_header.id != 0x4d42) {
>>> pr_notice("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
>>> bmp_header.id);
>>> - return;
>>> + goto out;
>>> }
>>> bgrt_image_size = bmp_header.size;
>>> + efi_mem_reserve(bgrt->image_address, bgrt_image_size);
>>>
>>> - bgrt_image = memremap(bgrt_tab->image_address, bmp_header.size, MEMREMAP_WB);
>>> - if (!bgrt_image) {
>>> - pr_notice("Ignoring BGRT: failed to map image memory\n");
>>> - bgrt_image = NULL;
>>> - return;
>>> - }
>>> -
>>> - efi_mem_reserve(bgrt_tab->image_address, bgrt_image_size);
>>> + return;
>>> +out:
>>> + memset(bgrt, 0, sizeof(bgrt_tab));
>>> }
>>> --- linux-x86.orig/drivers/acpi/bgrt.c
>>> +++ linux-x86/drivers/acpi/bgrt.c
>>> @@ -15,40 +15,41 @@
>>> #include <linux/sysfs.h>
>>> #include <linux/efi-bgrt.h>
>>>
>>> +static void *bgrt_image;
>>> static struct kobject *bgrt_kobj;
>>>
>>> static ssize_t show_version(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version);
>>> }
>>> static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
>>>
>>> static ssize_t show_status(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status);
>>> }
>>> static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
>>>
>>> static ssize_t show_type(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type);
>>> }
>>> static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
>>>
>>> static ssize_t show_xoffset(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x);
>>> }
>>> static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
>>>
>>> static ssize_t show_yoffset(struct device *dev,
>>> struct device_attribute *attr, char *buf)
>>> {
>>> - return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y);
>>> + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y);
>>> }
>>> static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
>>>
>>> @@ -84,15 +85,24 @@ static int __init bgrt_init(void)
>>> {
>>> int ret;
>>>
>>> - if (!bgrt_image)
>>> + if (!bgrt_tab.image_address)
>>> return -ENODEV;
>>>
>>> + bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
>>> + MEMREMAP_WB);
>>> + if (!bgrt_image) {
>>> + pr_notice("Ignoring BGRT: failed to map image memory\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> bin_attr_image.private = bgrt_image;
>>> bin_attr_image.size = bgrt_image_size;
>>>
>>> bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
>>> - if (!bgrt_kobj)
>>> - return -EINVAL;
>>> + if (!bgrt_kobj) {
>>> + ret = -EINVAL;
>>> + goto out_memmap;
>>> + }
>>>
>>> ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
>>> if (ret)
>>> @@ -102,6 +112,8 @@ static int __init bgrt_init(void)
>>>
>>> out_kobject:
>>> kobject_put(bgrt_kobj);
>>> +out_memmap:
>>> + memunmap(bgrt_image);
>>> return ret;
>>> }
>>> device_initcall(bgrt_init);
>>> --- linux-x86.orig/include/linux/efi-bgrt.h
>>> +++ linux-x86/include/linux/efi-bgrt.h
>>> @@ -1,20 +1,19 @@
>>> #ifndef _LINUX_EFI_BGRT_H
>>> #define _LINUX_EFI_BGRT_H
>>>
>>> -#ifdef CONFIG_ACPI_BGRT
>>> -
>>> #include <linux/acpi.h>
>>>
>>> -void efi_bgrt_init(void);
>>> +#ifdef CONFIG_ACPI_BGRT
>>> +
>>> +void efi_bgrt_init(struct acpi_table_header *table);
>>>
>>> /* The BGRT data itself; only valid if bgrt_image != NULL. */
>>> -extern void *bgrt_image;
>>> extern size_t bgrt_image_size;
>>> -extern struct acpi_table_bgrt *bgrt_tab;
>>> +extern struct acpi_table_bgrt bgrt_tab;
>>>
>>> #else /* !CONFIG_ACPI_BGRT */
>>>
>>> -static inline void efi_bgrt_init(void) {}
>>> +static inline void efi_bgrt_init(struct acpi_table_header *table) {}
>>>
>>> #endif /* !CONFIG_ACPI_BGRT */
>>>
>>> --- linux-x86.orig/arch/x86/platform/efi/efi.c
>>> +++ linux-x86/arch/x86/platform/efi/efi.c
>>> @@ -542,11 +542,6 @@ void __init efi_init(void)
>>> efi_print_memmap();
>>> }
>>>
>>> -void __init efi_late_init(void)
>>> -{
>>> - efi_bgrt_init();
>>> -}
>>> -
>>> void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
>>> {
>>> u64 addr, npages;
>>> --- linux-x86.orig/init/main.c
>>> +++ linux-x86/init/main.c
>>> @@ -663,7 +663,6 @@ asmlinkage __visible void __init start_k
>>> sfi_init_late();
>>>
>>> if (efi_enabled(EFI_RUNTIME_SERVICES)) {
>>> - efi_late_init();
>>> efi_free_boot_services();
>>> }
>>>
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