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[PATCH 4/9] x86/mwait-idle: move pre-initialized struct idle_cpu instances


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Thu, 12 Mar 2026 17:55:50 +0100
  • Autocrypt: addr=jbeulich@xxxxxxxx; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL
  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Thu, 12 Mar 2026 16:55:55 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Now that they're not referenced anymore post-init, they can themselves
move into .init.rodata. (idle_cpu_adl{,_l} can also become const in the
first place.)

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -1167,132 +1167,132 @@ static void cf_check c1e_promotion_disab
        wrmsrl(MSR_IA32_POWER_CTL, msr_bits);
 }
 
-static const struct idle_cpu idle_cpu_nehalem = {
+static const struct idle_cpu __initconstrel idle_cpu_nehalem = {
        .state_table = nehalem_cstates,
        .auto_demotion_disable_flags = NHM_C1_AUTO_DEMOTE | NHM_C3_AUTO_DEMOTE,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_atom = {
+static const struct idle_cpu __initconstrel idle_cpu_atom = {
        .state_table = atom_cstates,
 };
 
-static const struct idle_cpu idle_cpu_tangier = {
+static const struct idle_cpu __initconstrel idle_cpu_tangier = {
        .state_table = tangier_cstates,
 };
 
-static const struct idle_cpu idle_cpu_lincroft = {
+static const struct idle_cpu __initconstrel idle_cpu_lincroft = {
        .state_table = atom_cstates,
        .auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE,
 };
 
-static const struct idle_cpu idle_cpu_snb = {
+static const struct idle_cpu __initconstrel idle_cpu_snb = {
        .state_table = snb_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_byt = {
+static const struct idle_cpu __initconstrel idle_cpu_byt = {
        .state_table = byt_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_cht = {
+static const struct idle_cpu __initconstrel idle_cpu_cht = {
        .state_table = cht_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_ivb = {
+static const struct idle_cpu __initconstrel idle_cpu_ivb = {
        .state_table = ivb_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_ivt = {
+static const struct idle_cpu __initconstrel idle_cpu_ivt = {
        .state_table = ivt_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_hsw = {
+static const struct idle_cpu __initconstrel idle_cpu_hsw = {
        .state_table = hsw_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_bdw = {
+static const struct idle_cpu __initconstrel idle_cpu_bdw = {
        .state_table = bdw_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_skl = {
+static const struct idle_cpu __initconstrel idle_cpu_skl = {
        .state_table = skl_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_skx = {
+static const struct idle_cpu __initconstrel idle_cpu_skx = {
        .state_table = skx_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_icx = {
+static const struct idle_cpu __initconstrel idle_cpu_icx = {
        .state_table = icx_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static struct idle_cpu __ro_after_init idle_cpu_adl = {
+static const struct idle_cpu __initconstrel idle_cpu_adl = {
        .state_table = adl_cstates,
 };
 
-static struct idle_cpu __ro_after_init idle_cpu_adl_l = {
+static const struct idle_cpu __initconstrel idle_cpu_adl_l = {
        .state_table = adl_l_cstates,
 };
 
-static const struct idle_cpu idle_cpu_mtl_l = {
+static const struct idle_cpu __initconstrel idle_cpu_mtl_l = {
        .state_table = mtl_l_cstates,
 };
 
-static const struct idle_cpu idle_cpu_gmt = {
+static const struct idle_cpu __initconstrel idle_cpu_gmt = {
        .state_table = gmt_cstates,
 };
 
-static const struct idle_cpu idle_cpu_spr = {
+static const struct idle_cpu __initconstrel idle_cpu_spr = {
        .state_table = spr_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_gnr = {
+static const struct idle_cpu __initconstrel idle_cpu_gnr = {
        .state_table = gnr_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_gnrd = {
+static const struct idle_cpu __initconstrel idle_cpu_gnrd = {
        .state_table = gnrd_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_avn = {
+static const struct idle_cpu __initconstrel idle_cpu_avn = {
        .state_table = avn_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_bxt = {
+static const struct idle_cpu __initconstrel idle_cpu_bxt = {
        .state_table = bxt_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_dnv = {
+static const struct idle_cpu __initconstrel idle_cpu_dnv = {
        .state_table = dnv_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_snr = {
+static const struct idle_cpu __initconstrel idle_cpu_snr = {
        .state_table = snr_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_grr = {
+static const struct idle_cpu __initconstrel idle_cpu_grr = {
        .state_table = grr_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
-static const struct idle_cpu idle_cpu_srf = {
+static const struct idle_cpu __initconstrel idle_cpu_srf = {
        .state_table = srf_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };




 


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