linux-kernel - [PATCH v18 10/17] kdump: Simplify the parameters of __parse

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Date:   Wed, 22 Dec 2021 21:08:13 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        <x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>,
        <linux-kernel@...r.kernel.org>, Dave Young <dyoung@...hat.com>,
        Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        <kexec@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        <devicetree@...r.kernel.org>, Jonathan Corbet <corbet@....net>,
        <linux-doc@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Zhou <dingguo.cz@...group.com>,
        "John Donnelly" <John.p.donnelly@...cle.com>
Subject: [PATCH v18 10/17] kdump: Simplify the parameters of __parse_crashkernel()

After commit adbc742bf786 ("x86, kdump: Change crashkernel_high/low= to
crashkernel=,high/low"), all kdump bootup parameters start with
"crashkernel=". Therefore, it is better for __parse_crashkernel() to use
it directly than for the caller to pass it. So the parameter 'name' can
be omitted.

Similarly, we can pass the suffix type instead of the suffix name to avoid
the global variable 'suffix_tbl' appearing in multiple places.

There is no change in functionality, but it makes the code look a little
more concise.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 kernel/crash_core.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 64ed082382f3f18..496dae2718cf026 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -233,11 +233,12 @@ static int __init __parse_crashkernel(char *cmdline,
 			     unsigned long long system_ram,
 			     unsigned long long *crash_size,
 			     unsigned long long *crash_base,
-			     const char *name,
-			     const char *suffix)
+			     int suffix_type)
 {
 	char	*first_colon, *first_space;
 	char	*ck_cmdline;
+	const char *name = "crashkernel=";
+	const char *suffix = suffix_tbl[suffix_type];
 
 	BUG_ON(!crash_size || !crash_base);
 	*crash_size = 0;
@@ -275,8 +276,7 @@ int __init parse_crashkernel(char *cmdline,
 			     unsigned long long *crash_size,
 			     unsigned long long *crash_base)
 {
-	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
-					"crashkernel=", NULL);
+	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, SUFFIX_NULL);
 }
 
 int __init parse_crashkernel_high(char *cmdline,
@@ -284,8 +284,7 @@ int __init parse_crashkernel_high(char *cmdline,
 			     unsigned long long *crash_size,
 			     unsigned long long *crash_base)
 {
-	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
-				"crashkernel=", suffix_tbl[SUFFIX_HIGH]);
+	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, SUFFIX_HIGH);
 }
 
 int __init parse_crashkernel_low(char *cmdline,
@@ -293,8 +292,7 @@ int __init parse_crashkernel_low(char *cmdline,
 			     unsigned long long *crash_size,
 			     unsigned long long *crash_base)
 {
-	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
-				"crashkernel=", suffix_tbl[SUFFIX_LOW]);
+	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, SUFFIX_LOW);
 }
 
 /*
-- 
2.25.1