commit 92b3e1b37b4391318424898bca8d6e9e961f046a
author Ryan Prichard <rprichard@google.com> Mon Mar 11 17:27:52 2019 -0700
committer Ryan Prichard <rprichard@google.com> Tue Mar 12 01:11:24 2019 +0000
tree 415d99dda50e82f2bba111c1b0aa80e1537e5ddc
parent b0e2dd090bc74f36e3f2cafe85f542b785d760df

Cosmetic changes to linker allocator and config

Make the num_free_blocks calculation clearer. There are
sizeof(page->bytes) bytes available for blocks, which is equal to
(kAllocateSize - 16). The previous calculation overestimates the amount
of space by 8 or 12 bytes, but that doesn't change the result because
both kAllocateSize and block_size_ are multiples of 16.

Bug: none
Test: boot device, bionic unit tests
Change-Id: Ia880cd5abc2a7bb4e9e6a8c0441d985f4df8fdc4

linker/linker_block_allocator.cpp

diff --git a/linker/linker_block_allocator.cpp b/linker/linker_block_allocator.cpp
index fdb4c85..1e2f9a2 100644
--- a/linker/linker_block_allocator.cpp
+++ b/linker/linker_block_allocator.cpp
@@ -134,7 +134,7 @@
 
   FreeBlockInfo* first_block = reinterpret_cast<FreeBlockInfo*>(page->bytes);
   first_block->next_block = free_block_list_;
-  first_block->num_free_blocks = (kAllocateSize - sizeof(LinkerBlockAllocatorPage*))/block_size_;
+  first_block->num_free_blocks = sizeof(page->bytes) / block_size_;
 
   free_block_list_ = first_block;