linux-kernel - [PATCH v3 15/21] x86/kaslr: Drop redundant check in store_slot

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Message-Id: <20200728225722.67457-16-nivedita@alum.mit.edu>
Date:   Tue, 28 Jul 2020 18:57:16 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Kees Cook <keescook@...omium.org>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v3 15/21] x86/kaslr: Drop redundant check in store_slot_info

Drop unnecessary check that number of slots is not zero in
store_slot_info, it's guaranteed to be at least 1 by the calculation.

Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
---
 arch/x86/boot/compressed/kaslr.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index a87800aa6eda..2f43b0d7051e 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -525,13 +525,10 @@ static void store_slot_info(struct mem_vector *region, unsigned long image_size)
 		return;
 
 	slot_area.addr = region->start;
-	slot_area.num = (region->size - image_size) /
-			CONFIG_PHYSICAL_ALIGN + 1;
+	slot_area.num = 1 + (region->size - image_size) / CONFIG_PHYSICAL_ALIGN;
 
-	if (slot_area.num > 0) {
-		slot_areas[slot_area_index++] = slot_area;
-		slot_max += slot_area.num;
-	}
+	slot_areas[slot_area_index++] = slot_area;
+	slot_max += slot_area.num;
 }
 
 /*
-- 
2.26.2