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    Subject[PATCH 2/2] x86/MCE: Add command line option to extend MCE Records pool
    Date
    Extension of MCE Records pool, based on system's CPU count, was undertaken
    through the previous patch (x86/MCE: Extend size of the MCE Records pool).

    Add a new command line parameter "mce-genpool-extend" to set the size of
    MCE Records pool to a predetermined number of pages instead of system's
    CPU count.

    Signed-off-by: Avadhut Naik <avadhut.naik@amd.com>
    ---
    .../admin-guide/kernel-parameters.txt | 2 ++
    arch/x86/kernel/cpu/mce/genpool.c | 22 ++++++++++++++++---
    2 files changed, 21 insertions(+), 3 deletions(-)

    diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
    index 3a1fa1f81d9d..62e7da4d9fda 100644
    --- a/Documentation/admin-guide/kernel-parameters.txt
    +++ b/Documentation/admin-guide/kernel-parameters.txt
    @@ -3135,6 +3135,8 @@

    mce=option [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst

    + mce-genpool-extend= [X86-64] Number of pages to add to MCE Records pool.
    +
    md= [HW] RAID subsystems devices and level
    See Documentation/admin-guide/md.rst.

    diff --git a/arch/x86/kernel/cpu/mce/genpool.c b/arch/x86/kernel/cpu/mce/genpool.c
    index aed01612d342..d6e04fa5ee07 100644
    --- a/arch/x86/kernel/cpu/mce/genpool.c
    +++ b/arch/x86/kernel/cpu/mce/genpool.c
    @@ -22,6 +22,7 @@
    #define MCE_POOLSZ (2 * PAGE_SIZE)
    #define CPU_GEN_MEMSZ 256

    +static unsigned int mce_genpool_extend;
    static struct gen_pool *mce_evt_pool;
    static LLIST_HEAD(mce_event_llist);
    static char gen_pool_buf[MCE_POOLSZ];
    @@ -123,10 +124,14 @@ int mce_gen_pool_extend(void)
    int ret = -ENOMEM;
    u32 num_threads;

    - num_threads = num_present_cpus();
    - len = PAGE_ALIGN(num_threads * CPU_GEN_MEMSZ);
    - addr = (unsigned long)kzalloc(len, GFP_KERNEL);
    + if (mce_genpool_extend) {
    + len = mce_genpool_extend * PAGE_SIZE;
    + } else {
    + num_threads = num_present_cpus();
    + len = PAGE_ALIGN(num_threads * CPU_GEN_MEMSZ);
    + }

    + addr = (unsigned long)kzalloc(len, GFP_KERNEL);
    if (!addr)
    goto out;

    @@ -159,6 +164,17 @@ static int mce_gen_pool_create(void)
    return ret;
    }

    +static int __init parse_mce_genpool_extend(char *str)
    +{
    + if (*str == '=')
    + str++;
    +
    + get_option(&str, &mce_genpool_extend);
    + return 1;
    +}
    +
    +__setup("mce-genpool-extend", parse_mce_genpool_extend);
    +
    int mce_gen_pool_init(void)
    {
    /* Just init mce_gen_pool once. */
    --
    2.34.1

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