[PATCH 1/7] kexec: Handle removal of multiple 'crashkernel' parameters

[Youling Tang <youling.tang@linux.dev>]

From: Youling Tang <tangyouling@kylinios.cn>

When the kernel command line contains multiple 'crashkernel' parameters
(e.g., `crashkernel=1G,high crashkernel=256M,low`), the original
`remove_parameter()` function only removed the first instance. This
left residual parameters that caused conflicts during kexec operations.

Signed-off-by: Youling Tang <tangyouling@kylinios.cn>
---
 kexec/kexec.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kexec/kexec.c b/kexec/kexec.c
index 6bf12d7..c9e4bcb 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -1153,6 +1153,7 @@ void remove_parameter(char *line, const char *param_name)
 	if (!start)
 		return;
 
+again:
 	/*
 	 * check if that's really the start of a parameter and not in
 	 * the middle of the word
@@ -1167,6 +1168,11 @@ void remove_parameter(char *line, const char *param_name)
 		memmove(start, end+1, strlen(end));
 		*(end + strlen(end)) = 0;
 	}
+
+	/* There may be multiple 'crashkernel' parameters, such as low and high */
+	start = strstr(line, param_name);
+	if (start)
+		goto again;
 }
 
 static ssize_t _read(int fd, void *buf, size_t count)
-- 
2.34.1