linux-kernel - [PATCH v2 5/5] arm: use IS_ENABLED(CONFIG_KEXEC

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Date:   Tue,  7 Dec 2021 00:05:14 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        hpa@...or.com, Eric Biederman <ebiederm@...ssion.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, kexec@...ts.infradead.org,
        Alexandre ghiti <alex@...ti.fr>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: [PATCH v2 5/5] arm: use IS_ENABLED(CONFIG_KEXEC_CORE) instead of #ifdef

Replace the conditional compilation using "#ifdef CONFIG_KEXEC_CORE"
by a check for "IS_ENABLED(CONFIG_KEXEC_CORE)", to simplify the code
and increase compile coverage.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 arch/arm/kernel/setup.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 284a80c0b6e1..f9a054a344c0 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -973,7 +973,6 @@ static int __init init_machine_late(void)
 }
 late_initcall(init_machine_late);
 
-#ifdef CONFIG_KEXEC
 /*
  * The crash region must be aligned to 128MB to avoid
  * zImage relocating below the reserved region.
@@ -1001,6 +1000,9 @@ static void __init reserve_crashkernel(void)
 	unsigned long long total_mem;
 	int ret;
 
+	if (!IS_ENABLED(CONFIG_KEXEC_CORE))
+		return;
+
 	total_mem = get_total_mem();
 	ret = parse_crashkernel(boot_command_line, total_mem,
 				&crash_size, &crash_base);
@@ -1056,9 +1058,6 @@ static void __init reserve_crashkernel(void)
 		insert_resource(&iomem_resource, &crashk_boot_res);
 	}
 }
-#else
-static inline void reserve_crashkernel(void) {}
-#endif /* CONFIG_KEXEC */
 
 void __init hyp_mode_check(void)
 {
-- 
2.34.1