linux-kernel - [PATCH] crash_core: Fix the check for whether crashkernel is from high memory

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Date:   Sat,  9 Dec 2023 22:14:38 +0800
From:   Yuntao Wang <ytcoode@...il.com>
To:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org
Cc:     Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Dave Young <dyoung@...hat.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yuntao Wang <ytcoode@...il.com>
Subject: [PATCH] crash_core: Fix the check for whether crashkernel is from high memory

If crash_base is equal to CRASH_ADDR_LOW_MAX, it also indicates that
the crashkernel memory is allocated from high memory. However, the
current check only considers the case where crash_base is greater than
CRASH_ADDR_LOW_MAX. Fix it.

This patch also includes some minor cleanups.

Fixes: 0ab97169aa05 ("crash_core: add generic function to do reservation")
Signed-off-by: Yuntao Wang <ytcoode@...il.com>
---
 kernel/crash_core.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index efe87d501c8c..d4313b53837e 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -199,7 +199,7 @@ static __initdata char *suffix_tbl[] = {
  * It returns 0 on success and -EINVAL on failure.
  */
 static int __init parse_crashkernel_suffix(char *cmdline,
-					   unsigned long long	*crash_size,
+					   unsigned long long *crash_size,
 					   const char *suffix)
 {
 	char *cur = cmdline;
@@ -268,9 +268,9 @@ static int __init __parse_crashkernel(char *cmdline,
 			     unsigned long long *crash_base,
 			     const char *suffix)
 {
-	char	*first_colon, *first_space;
-	char	*ck_cmdline;
-	char	*name = "crashkernel=";
+	char *first_colon, *first_space;
+	char *ck_cmdline;
+	char *name = "crashkernel=";
 
 	BUG_ON(!crash_size || !crash_base);
 	*crash_size = 0;
@@ -440,7 +440,7 @@ void __init reserve_crashkernel_generic(char *cmdline,
 		return;
 	}
 
-	if ((crash_base > CRASH_ADDR_LOW_MAX) &&
+	if ((crash_base >= CRASH_ADDR_LOW_MAX) &&
 	     crash_low_size && reserve_crashkernel_low(crash_low_size)) {
 		memblock_phys_free(crash_base, crash_size);
 		return;
-- 
2.43.0