[PATCH v3 2/2] arm64: kexec: reduce calls to page_address()

From: Rongwei Wang
Date: Thu Nov 25 2021 - 12:08:22 EST


In kexec_page_alloc(), page_address() is called twice.
This patch add a new variable to help to reduce calls
to page_address().

Signed-off-by: Rongwei Wang <rongwei.wang@xxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/machine_kexec.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index 1038494..7f2530b 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c
@@ -104,13 +104,15 @@ static void *kexec_page_alloc(void *arg)
{
struct kimage *kimage = (struct kimage *)arg;
struct page *page = kimage_alloc_control_pages(kimage, 0);
+ void *vaddr = NULL;

if (!page)
return NULL;

- memset(page_address(page), 0, PAGE_SIZE);
+ vaddr = page_address(page);
+ memset(vaddr, 0, PAGE_SIZE);

- return page_address(page);
+ return vaddr;
}

int machine_kexec_post_load(struct kimage *kimage)
--
1.8.3.1