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binder: Scaffolding for binder_alloc KUnit tests

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Add setup and teardown for testing binder allocator code with KUnit.
Include minimal test cases to verify that tests are initialized
correctly.

Tested-by: Rae Moar <rmoar@google.com>
Signed-off-by: Tiffany Yang <ynaffit@google.com>
Acked-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20250714185321.2417234-5-ynaffit@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tiffany Yang
2025-07-14 11:53:17 -07:00
committed by Greg Kroah-Hartman
parent bdfa89c489
commit 5e024582f4
9 changed files with 208 additions and 6 deletions
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15
drivers/android/binder_alloc.c
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@@ -23,6 +23,7 @@
#include <linux/uaccess.h>
#include <linux/highmem.h>
#include <linux/sizes.h>
#include <kunit/visibility.h>
#include "binder_alloc.h"
#include "binder_trace.h"
@@ -57,13 +58,14 @@ static struct binder_buffer *binder_buffer_prev(struct binder_buffer *buffer)
return list_entry(buffer->entry.prev, struct binder_buffer, entry);
}
static size_t binder_alloc_buffer_size(struct binder_alloc *alloc,
struct binder_buffer *buffer)
VISIBLE_IF_KUNIT size_t binder_alloc_buffer_size(struct binder_alloc *alloc,
struct binder_buffer *buffer)
{
if (list_is_last(&buffer->entry, &alloc->buffers))
return alloc->vm_start + alloc->buffer_size - buffer->user_data;
return binder_buffer_next(buffer)->user_data - buffer->user_data;
}
EXPORT_SYMBOL_IF_KUNIT(binder_alloc_buffer_size);
static void binder_insert_free_buffer(struct binder_alloc *alloc,
struct binder_buffer *new_buffer)
@@ -955,7 +957,7 @@ err_invalid_mm:
failure_string, ret);
return ret;
}
EXPORT_SYMBOL_IF_KUNIT(binder_alloc_mmap_handler);
void binder_alloc_deferred_release(struct binder_alloc *alloc)
{
@@ -1024,6 +1026,7 @@ void binder_alloc_deferred_release(struct binder_alloc *alloc)
"%s: %d buffers %d, pages %d\n",
__func__, alloc->pid, buffers, page_count);
}
EXPORT_SYMBOL_IF_KUNIT(binder_alloc_deferred_release);
/**
* binder_alloc_print_allocated() - print buffer info
@@ -1116,6 +1119,7 @@ void binder_alloc_vma_close(struct binder_alloc *alloc)
{
binder_alloc_set_mapped(alloc, false);
}
EXPORT_SYMBOL_IF_KUNIT(binder_alloc_vma_close);
/**
* binder_alloc_free_page() - shrinker callback to free pages
@@ -1223,8 +1227,8 @@ binder_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
static struct shrinker *binder_shrinker;
static void __binder_alloc_init(struct binder_alloc *alloc,
struct list_lru *freelist)
VISIBLE_IF_KUNIT void __binder_alloc_init(struct binder_alloc *alloc,
struct list_lru *freelist)
{
alloc->pid = current->group_leader->pid;
alloc->mm = current->mm;
@@ -1233,6 +1237,7 @@ static void __binder_alloc_init(struct binder_alloc *alloc,
INIT_LIST_HEAD(&alloc->buffers);
alloc->freelist = freelist;
}
EXPORT_SYMBOL_IF_KUNIT(__binder_alloc_init);
/**
* binder_alloc_init() - called by binder_open() for per-proc initialization