[PATCH v4 1/5] efi: Drop the memset() from efi_alloc()

[Simon Glass]

>From my inspection none of the users need the memory to be zeroed. It
is somewhat unexpected that it does so, since the name gives no clue to
this.

Drop the memset() so that it effectively becomes a wrapper around the
normal EFI-pool allocator.

Another option would be to drop this function and call
efi_allocate_pool() directly, but that increase code size a little.

Move the function comment to the header file like most other exported
functions in U-Boot.

Comments were made in v3 that another project uses memset() when
allocating memory, but that is not required by the spec. In any case, as
above, from inspection, none of the users need the memory to be zeroed,
as they fill the entire region with their own data.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v4:
- Expand the commit message

Changes in v3:
- Add new patch to drop the memset() from efi_alloc()
- Drop patch to convert device_path allocation to use malloc()

 include/efi_loader.h        | 11 ++++++++++-
 lib/efi_loader/efi_memory.c |  9 ---------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 511281e150e..08e27e61b06 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -758,8 +758,17 @@ efi_status_t efi_next_variable_name(efi_uintn_t *size, u16 **buf,
  * Return:	size in pages
  */
 #define efi_size_in_pages(size) (((size) + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT)
-/* Allocate boot service data pool memory */
+
+/**
+ * efi_alloc() - allocate boot services data pool memory
+ *
+ * Allocate memory from pool with type EFI_BOOT_SERVICES_DATA
+ *
+ * @size:	number of bytes to allocate
+ * Return:	pointer to allocated memory, or NULL if out of memory
+ */
 void *efi_alloc(size_t len);
+
 /* Allocate pages on the specified alignment */
 void *efi_alloc_aligned_pages(u64 len, int memory_type, size_t align);
 /* More specific EFI memory allocator, called by EFI payloads */
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index c6f1dd09456..50cb2f3898b 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -664,14 +664,6 @@ efi_status_t efi_allocate_pool(enum efi_memory_type pool_type, efi_uintn_t size,
 	return r;
 }
 
-/**
- * efi_alloc() - allocate boot services data pool memory
- *
- * Allocate memory from pool and zero it out.
- *
- * @size:	number of bytes to allocate
- * Return:	pointer to allocated memory or NULL
- */
 void *efi_alloc(size_t size)
 {
 	void *buf;
@@ -681,7 +673,6 @@ void *efi_alloc(size_t size)
 		log_err("out of memory");
 		return NULL;
 	}
-	memset(buf, 0, size);
 
 	return buf;
 }
-- 
2.34.1