ANDROID: Add vendor hook for highmem movable page allocations

The associated vendor hooks are used for adjusting gfp flags
during highmem movable page allocations. We would like to implement different gfp depends on CMA's size.

Bug: 284797897
Test: build pass
Change-Id: I7e4f748299eb4517fbc2c95dc2d7b8a21ed3d828
Signed-off-by: zhaoyang.huang <zhaoyang.huang@unisoc.com>

arch/arm64/mm/fault.c

@@ -45,6 +45,7 @@
 #include <asm/virt.h>
 
 #include <trace/hooks/fault.h>
+#include <trace/hooks/mm.h>
 
 struct fault_info {
 	int	(*fn)(unsigned long far, unsigned int esr,
@@ -1010,6 +1011,7 @@ struct page *alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
 {
 	gfp_t flags = GFP_HIGHUSER_MOVABLE | __GFP_ZERO | __GFP_CMA;
 
+	trace_android_vh_alloc_highpage_movable_gfp_adjust(&flags);
 	/*
 	 * If the page is mapped with PROT_MTE, initialise the tags at the
 	 * point of allocation and page zeroing as this is usually faster than

drivers/android/vendor_hooks.c

@@ -415,6 +415,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_tune_inactive_ratio);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_check_hibernation_swap);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_save_cpu_resume);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_save_hib_resume_bdev);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_highpage_movable_gfp_adjust);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_dma_buf_stats_teardown);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_madvise_cold_or_pageout);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_cma_alloc_retry);

include/trace/hooks/mm.h

@@ -180,6 +180,9 @@ DECLARE_HOOK(android_vh_free_one_page_bypass,
 DECLARE_HOOK(android_vh_use_cma_first_check,
 	TP_PROTO(bool *use_cma_first_check),
 	TP_ARGS(use_cma_first_check));
+DECLARE_HOOK(android_vh_alloc_highpage_movable_gfp_adjust,
+	TP_PROTO(gfp_t *gfp_mask),
+	TP_ARGS(gfp_mask));
 #endif /* _TRACE_HOOK_MM_H */
 
 /* This part must be outside protection */