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ANDROID: Split ANDROID_STRUCT_PADDING into separate configs

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Not all non-GKI platforms support disabling ANDROID_STRUCT_PADDING,
as some modules may require Android vendor data. However, it would be
beneficial to have the option to disable some of the struct paddings,
such as ANDROID_KABI_RESERVE, for memory savings given a situation
where the ANDROID_STRUCT_PADDING config cannot be disabled.

Split the ANDROID_STRUCT_PADDING config into two configs, one to control
ANDROID_VENDOR_DATA and ANDROID_OEM_DATA, and another to control
ANDROID_KABI_RESERVE.

Bug: 206561931
Change-Id: Iea4b962dff386a17c9bef20ae048be4e17bf43ab
Signed-off-by: Jaskaran Singh <quic_jasksing@quicinc.com>
This commit is contained in:
Jaskaran Singh
2022-04-06 10:57:39 +05:30
parent 5b1bb43708
commit 3c06a5ce5e
4 changed files with 24 additions and 6 deletions
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24
drivers/android/Kconfig
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@@ -74,14 +74,32 @@ config ANDROID_VENDOR_HOOKS
Allow vendor modules to attach to tracepoint "hooks" defined via
DECLARE_HOOK or DECLARE_RESTRICTED_HOOK.
config ANDROID_STRUCT_PADDING
bool "Android Struct Padding"
config ANDROID_KABI_RESERVE
bool "Android KABI reserve padding"
default y
help
This option enables the padding that the Android GKI kernel adds
to many different kernel structures to support an in-kernel stable ABI
over the lifespan of support for the kernel.
Only disable this option if you have a system that needs the Android
kernel drivers, but is NOT an Android GKI kernel image. If disabled
it has the possibility to make the kernel static and runtime image
slightly smaller but will NOT be supported by the Google Android
kernel team.
If even slightly unsure, say Y.
config ANDROID_VENDOR_OEM_DATA
bool "Android vendor and OEM data padding"
default y
help
This option enables the padding that the Android GKI kernel adds
to many different kernel structures to support an in-kernel stable ABI
over the lifespan of support for the kernel as well as OEM additional
fields that are needed by some of the Android kernel tracepoints.
fields that are needed by some of the Android kernel tracepoints. The
macros enabled by this option are used to enable padding in vendor modules
used for the above specified purposes.
Only disable this option if you have a system that needs the Android
kernel drivers, but is NOT an Android GKI kernel image and you do NOT

2
include/linux/android_kabi.h
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@@ -83,7 +83,7 @@
* number: the "number" of the padding variable in the structure. Start with
* 1 and go up.
*/
#ifdef CONFIG_ANDROID_STRUCT_PADDING
#ifdef CONFIG_ANDROID_KABI_RESERVE
#define ANDROID_KABI_RESERVE(number) _ANDROID_KABI_RESERVE(number)
#else
#define ANDROID_KABI_RESERVE(number)

2
include/linux/android_vendor.h
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@@ -26,7 +26,7 @@
* Same as ANDROID_VENDOR_DATA but allocates an array of u64 with
* the specified size
*/
#ifdef CONFIG_ANDROID_STRUCT_PADDING
#ifdef CONFIG_ANDROID_VENDOR_OEM_DATA
#define ANDROID_VENDOR_DATA(n) u64 android_vendor_data##n
#define ANDROID_VENDOR_DATA_ARRAY(n, s) u64 android_vendor_data##n[s]

2
init/init_task.c
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@@ -213,7 +213,7 @@ struct task_struct init_task
#ifdef CONFIG_SECCOMP_FILTER
.seccomp = { .filter_count = ATOMIC_INIT(0) },
#endif
#ifdef CONFIG_ANDROID_STRUCT_PADDING
#ifdef CONFIG_ANDROID_VENDOR_OEM_DATA
.android_vendor_data1 = {0, },
.android_oem_data1 = {0, },
#endif