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x86/mtrr: Use kstrtoul() in parse_mtrr_spare_reg()

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Replace the deprecated simple_strtoul()¹ with kstrtoul() for parsing the early
boot parameter mtrr_spare_reg_nr. simple_strtoul() silently sets
nr_mtrr_spare_reg to 0 for invalid input instead of rejecting it and keeping
the default value.

Return kstrtoul()'s retval directly to propagate parsing failures instead of
treating them as success. Also return -EINVAL when '=' is missing from the
boot parameter and 'arg' is NULL.

  ¹ https://www.kernel.org/doc/html/latest/process/deprecated.html#simple-strtol-simple-strtoll-simple-strtoul-simple-strtoull

  [ bp: Massage commit message. ]

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260302135341.3473-2-thorsten.blum@linux.dev
This commit is contained in:
Thorsten Blum 2026-03-02 14:53:40 +01:00 committed by Borislav Petkov (AMD)
parent 11439c4635
commit 9a4af5a00a
1 changed files with 4 additions and 3 deletions
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7
arch/x86/kernel/cpu/mtrr/cleanup.c
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@ -437,9 +437,10 @@ static unsigned long nr_mtrr_spare_reg __initdata =
static int __init parse_mtrr_spare_reg(char *arg)
{
if (arg)
nr_mtrr_spare_reg = simple_strtoul(arg, NULL, 0);
return 0;
if (!arg)
return -EINVAL;
return kstrtoul(arg, 0, &nr_mtrr_spare_reg);
}
early_param("mtrr_spare_reg_nr", parse_mtrr_spare_reg);