[PATCH v2 1/2] tools/nolibc: stop rounding malloc() sizes up to 4096 bytes

[Danish Khateeb <danishkhateeb03@gmail.com>]

malloc() rounds the size of each mapping up to a multiple of 4096,
presumably to align it to a page boundary. But the page size is not 4096
on all architectures, and mmap() and munmap() round the length up to the
page size themselves.

Drop the rounding. As heap->len is no longer rounded up, growing a block
with realloc() now always creates a new mapping.

Assisted-by: LLM
Signed-off-by: Danish Khateeb <danishkhateeb03@gmail.com>
---
 tools/include/nolibc/stdlib.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/tools/include/nolibc/stdlib.h b/tools/include/nolibc/stdlib.h
index 6c3c620a04cf..dc554faff22a 100644
--- a/tools/include/nolibc/stdlib.h
+++ b/tools/include/nolibc/stdlib.h
@@ -130,9 +130,7 @@ void *malloc(size_t len)
 {
 	struct nolibc_heap *heap;
 
-	/* Always allocate memory with size multiple of 4096. */
 	len  = sizeof(*heap) + len;
-	len  = (len + 4095UL) & -4096UL;
 	heap = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE,
 		    -1, 0);
 	if (__builtin_expect(heap == MAP_FAILED, 0))
-- 
2.55.0