From: Rongwei Wang <rongwei.wang@linux.alibaba.com>
To: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com,
james.morse@arm.com, ardb@kernel.org, tabba@google.com,
akpm@linux-foundation.org, rppt@kernel.org,
anshuman.khandual@arm.com, pasha.tatashin@soleen.com
Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 2/2] arm64: kexec: reduce calls to page_address()
Date: Fri, 26 Nov 2021 01:06:00 +0800 [thread overview]
Message-ID: <20211125170600.1608-3-rongwei.wang@linux.alibaba.com> (raw)
In-Reply-To: <20211125170600.1608-1-rongwei.wang@linux.alibaba.com>
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@linux.alibaba.com>
---
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
next prev parent reply other threads:[~2021-11-25 17:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-30 18:31 [PATCH 0/2] fix bug when calling kexec_load() Rongwei Wang
2021-10-30 18:31 ` [PATCH 1/2] arm64: trans_pgd: fix incorrect use of pmd_populate_kernel in copy_pte() Rongwei Wang
2021-10-31 12:25 ` Ard Biesheuvel
2021-11-01 2:14 ` Rongwei Wang
2021-11-05 5:58 ` Rongwei Wang
2021-10-30 18:32 ` [PATCH 2/2] arm64: kexec: reduce calls to page_address() Rongwei Wang
2021-11-14 20:16 ` [PATCH v2 0/2] fix bug when calling kexec_load() Rongwei Wang
2021-11-14 20:16 ` [PATCH v2 1/2] arm64: trans_pgd: fix incorrect use of pmd_populate_kernel in copy_pte() Rongwei Wang
2021-11-19 3:04 ` Rongwei Wang
2021-11-14 20:16 ` [PATCH v2 2/2] arm64: kexec: reduce calls to page_address() Rongwei Wang
2021-11-25 17:05 ` [PATCH v3 0/2] simple optimizations for page_address and Rongwei Wang
2021-11-25 17:05 ` [PATCH v3 1/2] arm64: trans_pgd: unify the use of pmd_populate_kernel Rongwei Wang
2021-11-25 17:06 ` Rongwei Wang [this message]
2021-12-10 18:40 ` (subset) [PATCH v3 0/2] simple optimizations for page_address and Catalin Marinas
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