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kdump: return -ENOENT if required cmdline option does not exist 

According to the current crashkernel=Y,low support in other ARCHes, it's
an optional command-line option. When it doesn't exist, kernel will try
to allocate minimum required memory below 4G automatically.

However, __parse_crashkernel() returns '-EINVAL' for all error cases. It
can't distinguish the nonexistent option from invalid option.

Change __parse_crashkernel() to return '-ENOENT' for the nonexistent option
case. With this change, crashkernel,low memory will take the default
value if crashkernel=,low is not specified; while crashkernel reservation
will fail and bail out if an invalid option is specified.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Acked-by: Baoquan He <bhe@redhat.com>
Link: https://lore.kernel.org/r/20220506114402.365-2-thunder.leizhen@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Zhen Lei 2022-05-06 19:43:57 +08:00 committed by Catalin Marinas
parent b2d229d4dd
commit 2e5920bb07
1 changed files with 1 additions and 2 deletions
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3
kernel/crash_core.c
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@ -243,9 +243,8 @@ static int __init __parse_crashkernel(char *cmdline,
*crash_base = 0;
ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
if (!ck_cmdline)
return -EINVAL;
return -ENOENT;
ck_cmdline += strlen(name);