linux-kernel - [PATCH] riscv/mm: Use BUG_ON instead of if condition followed by BUG.

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Date:   Tue, 30 Mar 2021 06:56:26 -0700
From:   zhouchuangao <zhouchuangao@...o.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atish.patra@....com>,
        Anup Patel <anup.patel@....com>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Zong Li <zong.li@...ive.com>,
        Nick Kossifidis <mick@....forth.gr>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     zhouchuangao <zhouchuangao@...o.com>
Subject: [PATCH] riscv/mm: Use BUG_ON instead of if condition followed by BUG.

BUG_ON() uses unlikely in if(), which can be optimized at compile time.

Signed-off-by: zhouchuangao <zhouchuangao@...o.com>
---
 arch/riscv/mm/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 067583a..a7fa5e2 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -213,8 +213,8 @@ static phys_addr_t alloc_pte_late(uintptr_t va)
 	unsigned long vaddr;
 
 	vaddr = __get_free_page(GFP_KERNEL);
-	if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
-		BUG();
+	BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
+
 	return __pa(vaddr);
 }
 
-- 
2.7.4