linux-kernel - [PATCH v4 18/20] x86, kaslr: Remove useless codes

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Message-Id: <1458631937-14593-19-git-send-email-bhe@redhat.com>
Date:	Tue, 22 Mar 2016 15:32:15 +0800
From:	Baoquan He <bhe@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	yinghai@...nel.org, keescook@...omium.org, hpa@...or.com,
	mingo@...hat.com, bp@...en8.de, vgoyal@...hat.com, luto@...nel.org,
	lasse.collin@...aani.org, akpm@...ux-foundation.org,
	dyoung@...hat.com, Baoquan He <bhe@...hat.com>
Subject: [PATCH v4 18/20] x86, kaslr: Remove useless codes

Several auxiliary functions and slots[] are not needed any more since
struct slot_area and new algorithm is used instead now. Hence remove
them in this patch.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/x86/boot/compressed/aslr.c | 24 ------------------------
 1 file changed, 24 deletions(-)

diff --git a/arch/x86/boot/compressed/aslr.c b/arch/x86/boot/compressed/aslr.c
index 21dad0a..ddfc3d0 100644
--- a/arch/x86/boot/compressed/aslr.c
+++ b/arch/x86/boot/compressed/aslr.c
@@ -112,17 +112,6 @@ struct mem_vector {
 #define MEM_AVOID_MAX 4
 static struct mem_vector mem_avoid[MEM_AVOID_MAX];
 
-static bool mem_contains(struct mem_vector *region, struct mem_vector *item)
-{
-	/* Item at least partially before region. */
-	if (item->start < region->start)
-		return false;
-	/* Item at least partially after region. */
-	if (item->start + item->size > region->start + region->size)
-		return false;
-	return true;
-}
-
 static bool mem_overlaps(struct mem_vector *one, struct mem_vector *two)
 {
 	/* Item one is entirely before item two. */
@@ -291,9 +280,6 @@ mem_min_overlap(struct mem_vector *img, struct mem_vector *out)
 	return min;
 }
 
-static unsigned long slots[CONFIG_RANDOMIZE_BASE_MAX_OFFSET /
-			   CONFIG_PHYSICAL_ALIGN];
-
 struct slot_area {
 	unsigned long addr;
 	int num;
@@ -324,16 +310,6 @@ static void store_slot_info(struct mem_vector *region, unsigned long image_size)
 	}
 }
 
-static void slots_append(unsigned long addr)
-{
-	/* Overflowing the slots list should be impossible. */
-	if (slot_max >= CONFIG_RANDOMIZE_BASE_MAX_OFFSET /
-			CONFIG_PHYSICAL_ALIGN)
-		return;
-
-	slots[slot_max++] = addr;
-}
-
 static unsigned long slots_fetch_random(void)
 {
 	unsigned long random;
-- 
2.5.0