selftests/bpf: Add IRQ save/restore tests

JIRA: https://issues.redhat.com/browse/RHEL-78201

Conflicts: Context change from already backported commit adfdd9c
("selftests/bpf: Introduce __caps_unpriv annotation for tests")

commit 4fec4c2
Author: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Date:   Tue Dec 3 19:04:00 2024 -0800

    selftests/bpf: Add IRQ save/restore tests

    Include tests that check for rejection in erroneous cases, like
    unbalanced IRQ-disabled counts, within and across subprogs, invalid IRQ
    flag state or input to kfuncs, behavior upon overwriting IRQ saved state
    on stack, interaction with sleepable kfuncs/helpers, global functions,
    and out of order restore. Include some success scenarios as well to
    demonstrate usage.

    #128/1   irq/irq_save_bad_arg:OK
    #128/2   irq/irq_restore_bad_arg:OK
    #128/3   irq/irq_restore_missing_2:OK
    #128/4   irq/irq_restore_missing_3:OK
    #128/5   irq/irq_restore_missing_3_minus_2:OK
    #128/6   irq/irq_restore_missing_1_subprog:OK
    #128/7   irq/irq_restore_missing_2_subprog:OK
    #128/8   irq/irq_restore_missing_3_subprog:OK
    #128/9   irq/irq_restore_missing_3_minus_2_subprog:OK
    #128/10  irq/irq_balance:OK
    #128/11  irq/irq_balance_n:OK
    #128/12  irq/irq_balance_subprog:OK
    #128/13  irq/irq_global_subprog:OK
    #128/14  irq/irq_restore_ooo:OK
    #128/15  irq/irq_restore_ooo_3:OK
    #128/16  irq/irq_restore_3_subprog:OK
    #128/17  irq/irq_restore_4_subprog:OK
    #128/18  irq/irq_restore_ooo_3_subprog:OK
    #128/19  irq/irq_restore_invalid:OK
    #128/20  irq/irq_save_invalid:OK
    #128/21  irq/irq_restore_iter:OK
    #128/22  irq/irq_save_iter:OK
    #128/23  irq/irq_flag_overwrite:OK
    #128/24  irq/irq_flag_overwrite_partial:OK
    #128/25  irq/irq_ooo_refs_array:OK
    #128/26  irq/irq_sleepable_helper:OK
    #128/27  irq/irq_sleepable_kfunc:OK
    #128     irq:OK
    Summary: 1/27 PASSED, 0 SKIPPED, 0 FAILED

    Acked-by: Eduard Zingerman <eddyz87@gmail.com>
    Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
    Link: https://lore.kernel.org/r/20241204030400.208005-8-memxor@gmail.com
    Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>

Author: jeromemarchand

tools/testing/selftests/bpf/prog_tests/verifier.c

@@ -98,6 +98,7 @@
 #include "verifier_xdp_direct_packet_access.skel.h"
 #include "verifier_bits_iter.skel.h"
 #include "verifier_lsm.skel.h"
+#include "irq.skel.h"
 
 #define MAX_ENTRIES 11
 
@@ -225,6 +226,7 @@ void test_verifier_xdp(void)                  { RUN(verifier_xdp); }
 void test_verifier_xdp_direct_packet_access(void) { RUN(verifier_xdp_direct_packet_access); }
 void test_verifier_bits_iter(void) { RUN(verifier_bits_iter); }
 void test_verifier_lsm(void)                  { RUN(verifier_lsm); }
+void test_irq(void)			      { RUN(irq); }
 void test_verifier_mtu(void)		      { RUN(verifier_mtu); }
 
 static int init_test_val_map(struct bpf_object *obj, char *map_name)