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ANDROID: Configure out the macros in android_kabi and android_vendor

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Add one CONFIG to control removing the macros or not. On some platform,
configureing out the macros removes the associated members from the
structs, this reduces the object size of the slabs related with the
structs, therefore reduces the total slab memory consumption of system.

Besides, this also reduces vmlinux size a bit, therefore the total
kernel memory size increses a bit.

The macros are ANDROID_KABI_RESERVE, ANDROID_VENDOR_DATA,
ANDROID_VENDOR_DATA_ARRAY, ANDROID_OEM_DATA, ANDROID_OEM_DATA_ARRAY.

Bug: 206561931
Signed-off-by: Qingqing Zhou <quic_qqzhou@quicinc.com>
Change-Id: I0868d299ccce3c4b39f42af17916828500be6cc4
This commit is contained in:
Qingqing Zhou 2021-11-30 10:20:40 +08:00
parent bdc772adbd
commit b7a6c15a6f
5 changed files with 42 additions and 2 deletions
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17
drivers/android/Kconfig
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@ -74,6 +74,23 @@ 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"
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.
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
use the Android kernel tracepoints. 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.
endif # if ANDROID
endmenu

4
include/linux/android_kabi.h
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@ -83,7 +83,11 @@
* number: the "number" of the padding variable in the structure. Start with
* 1 and go up.
*/
#ifdef CONFIG_ANDROID_STRUCT_PADDING
#define ANDROID_KABI_RESERVE(number) _ANDROID_KABI_RESERVE(number)
#else
#define ANDROID_KABI_RESERVE(number)
#endif
/*

15
include/linux/android_vendor.h
View File

@ -26,10 +26,25 @@
* Same as ANDROID_VENDOR_DATA but allocates an array of u64 with
* the specified size
*/
#ifdef CONFIG_ANDROID_STRUCT_PADDING
#define ANDROID_VENDOR_DATA(n) u64 android_vendor_data##n
#define ANDROID_VENDOR_DATA_ARRAY(n, s) u64 android_vendor_data##n[s]
#define ANDROID_OEM_DATA(n) u64 android_oem_data##n
#define ANDROID_OEM_DATA_ARRAY(n, s) u64 android_oem_data##n[s]
#define android_init_vendor_data(p, n) \
memset(&p->android_vendor_data##n, 0, sizeof(p->android_vendor_data##n))
#define android_init_oem_data(p, n) \
memset(&p->android_oem_data##n, 0, sizeof(p->android_oem_data##n))
#else
#define ANDROID_VENDOR_DATA(n)
#define ANDROID_VENDOR_DATA_ARRAY(n, s)
#define ANDROID_OEM_DATA(n)
#define ANDROID_OEM_DATA_ARRAY(n, s)
#define android_init_vendor_data(p, n)
#define android_init_oem_data(p, n)
#endif
#endif /* _ANDROID_VENDOR_H */

2
init/init_task.c
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@ -213,8 +213,10 @@ struct task_struct init_task
#ifdef CONFIG_SECCOMP_FILTER
.seccomp = { .filter_count = ATOMIC_INIT(0) },
#endif
#ifdef CONFIG_ANDROID_STRUCT_PADDING
.android_vendor_data1 = {0, },
.android_oem_data1 = {0, },
#endif
};
EXPORT_SYMBOL(init_task);

6
kernel/fork.c
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@ -978,8 +978,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
#ifdef CONFIG_MEMCG
tsk->active_memcg = NULL;
#endif
memset(&tsk->android_vendor_data1, 0, sizeof(tsk->android_vendor_data1));
memset(&tsk->android_oem_data1, 0, sizeof(tsk->android_oem_data1));
android_init_vendor_data(tsk, 1);
android_init_oem_data(tsk, 1);
trace_android_vh_dup_task_struct(tsk, orig);
return tsk;