From: Himangi Saraogi <himangi774@gmail.com>
Date: Sat, 19 Jul 2014 11:35:13 +0000 (+0530)
Subject: m68k/mm: Eliminate memset after alloc_bootmem_pages
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f0b99a643e9613beb28af43333bbfa90d4bf85cc;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

m68k/mm: Eliminate memset after alloc_bootmem_pages

alloc_bootmem and related functions always return a zeroed region of memory.
Thus a memset after calls to these functions is unnecessary.

The following Coccinelle semantic patch was used for making the change:

@@
expression E,E1;
@@

E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...)
... when != E
- memset(E,0,E1);

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---

diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
index acaff6a49e35..b09a3cb29b68 100644
--- a/arch/m68k/mm/init.c
+++ b/arch/m68k/mm/init.c
@@ -94,7 +94,6 @@ void __init paging_init(void)
 	high_memory = (void *) end_mem;
 
 	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
-	memset(empty_zero_page, 0, PAGE_SIZE);
 
 	/*
 	 * Set up SFC/DFC registers (user data space).