Re: [PATCH 2/2] x86: add e820 descriptor attribute field

[H. Peter Anvin]

NAK in the extreme.  Not only does this break the bootloader protocol, but there are systems in the field that break if you give e820 anything other than a 20-byte buffer.

liguang <lig.fnst@xxxxxxxxxxxxxx> wrote:

>according to ACPI 5.0 Table 15-273
>Address Range Descriptor Structure,
>offset 20 is 32-bit field of Extended
>Attributes for Address Range Descriptor Structure.
>
>Signed-off-by: liguang <lig.fnst@xxxxxxxxxxxxxx>
>---
> arch/x86/include/uapi/asm/e820.h |    7 ++++++-
> 1 files changed, 6 insertions(+), 1 deletions(-)
>
>diff --git a/arch/x86/include/uapi/asm/e820.h
>b/arch/x86/include/uapi/asm/e820.h
>index 2d400b1..eb87284 100644
>--- a/arch/x86/include/uapi/asm/e820.h
>+++ b/arch/x86/include/uapi/asm/e820.h
>@@ -38,6 +38,10 @@
> #define E820_TYPE_NVS	4
> #define E820_TYPE_UNUSABLE	5
> 
>+#define E820_ATTRIB_NV 0x2
>+#define E820_ATTRIB_SLOW_ACCESS 0x4
>+#define E820_ATTRIB_ERR_LOG 0x8
>+
> 
> /*
>  * reserved RAM used by kernel itself
>@@ -53,7 +57,8 @@ struct e820entry {
> 	__u64 addr;	/* start of memory segment */
> 	__u64 size;	/* size of memory segment */
> 	__u32 type;	/* type of memory segment */
>-} __attribute__((packed));
>+	__u32 attrib;
>+};
> 
> struct e820map {
> 	__u32 nr_map;

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