linux-kernel - [PATCH v1] RISC-V: Add braces around an empty if statement bodies

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Message-Id: <20220419194846.18318-1-palmer@rivosinc.com>
Date:   Tue, 19 Apr 2022 12:48:46 -0700
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     panqinglin2020@...as.ac.cn
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, aou@...s.berkeley.edu,
        alexandre.ghiti@...onical.com, jszhang@...nel.org,
        wangkefeng.wang@...wei.com, mick@....forth.gr,
        vitaly.wool@...sulko.com, rppt@...nel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...osinc.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v1] RISC-V: Add braces around an empty if statement bodies

From: Palmer Dabbelt <palmer@...osinc.com>

This triggers -Wempty-body, which will cause the next statement (eventually
create_pmd_mapping) to be dropped.  Both of these were introduced by the same
commit.  This is safe for the reporting config (which is 32-bit), but IIUC
could result in breakages for 64-bit configs without 4/5 level paging like the
XIP configs.

Reported-by: kernel test robot <lkp@...el.com>
Fixes: 677b9eb8810e ("riscv: mm: Prepare pt_ops helper functions for sv57")
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
---
Might be better to define these to functions that are empty, but that's
slightly different than just fixing the commit/warning in question.
---
 arch/riscv/mm/init.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 9535bea8688c..637916857c4d 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -798,13 +798,15 @@ static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa)
 			   PGDIR_SIZE,
 			   IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL);
 
-	if (pgtable_l5_enabled)
+	if (pgtable_l5_enabled) {
 		create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA,
 				   (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE);
+	}
 
-	if (pgtable_l4_enabled)
+	if (pgtable_l4_enabled) {
 		create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA,
 				   (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE);
+	}
 
 	if (IS_ENABLED(CONFIG_64BIT)) {
 		create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
-- 
2.34.1