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/kernel/bpf/
Dtnum.c37 struct tnum tnum_lshift(struct tnum a, u8 shift) in tnum_lshift() argument
39 return TNUM(a.value << shift, a.mask << shift); in tnum_lshift()
42 struct tnum tnum_rshift(struct tnum a, u8 shift) in tnum_rshift() argument
44 return TNUM(a.value >> shift, a.mask >> shift); in tnum_rshift()
47 struct tnum tnum_arshift(struct tnum a, u8 min_shift, u8 insn_bitness) in tnum_arshift() argument
55 return TNUM((u32)(((s32)a.value) >> min_shift), in tnum_arshift()
56 (u32)(((s32)a.mask) >> min_shift)); in tnum_arshift()
58 return TNUM((s64)a.value >> min_shift, in tnum_arshift()
59 (s64)a.mask >> min_shift); in tnum_arshift()
62 struct tnum tnum_add(struct tnum a, struct tnum b) in tnum_add() argument
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DKconfig8 # flavour. Only one of the two can be selected for a specific arch since
44 BPF programs are normally handled by a BPF interpreter. This option
45 allows the kernel to generate native code when a program is loaded
/kernel/trace/
Dtracing_map.c130 char *a = val_a; in tracing_map_cmp_string() local
133 return strcmp(a, b); in tracing_map_cmp_string()
143 u64 a = atomic64_read((atomic64_t *)val_a); in tracing_map_cmp_atomic64() local
146 return (a > b) ? 1 : ((a < b) ? -1 : 0); in tracing_map_cmp_atomic64()
152 type a = (type)(*(u64 *)val_a); \
155 return (a > b) ? 1 : ((a < b) ? -1 : 0); \
287 static void tracing_map_array_clear(struct tracing_map_array *a) in tracing_map_array_clear() argument
291 if (!a->pages) in tracing_map_array_clear()
294 for (i = 0; i < a->n_pages; i++) in tracing_map_array_clear()
295 memset(a->pages[i], 0, PAGE_SIZE); in tracing_map_array_clear()
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DKconfig96 Adds a very slight overhead to tracing when enabled.
174 by using a compiler feature to insert a small, 5-byte No-Operation
176 sequence is then dynamically patched into a tracer call when
188 Enable the kernel to trace a function at both its return
191 draw a call graph for each thread with some information like
193 address on the current task structure into a stack of calls.
203 replace them with a No-Op instruction) on boot up. During
204 compile time, a table is made of all the locations that ftrace
215 This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but
240 When a 1 is echoed into this file profiling begins, and when a
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Dtrace_events_filter_test.h12 TP_PROTO(int a, int b, int c, int d, int e, int f, int g, int h),
14 TP_ARGS(a, b, c, d, e, f, g, h),
17 __field(int, a)
28 __entry->a = a;
39 __entry->a, __entry->b, __entry->c, __entry->d,
Dtrace_probe_tmpl.h265 struct probe_arg *a = args + i; in print_probe_args() local
267 trace_seq_printf(s, " %s=", a->name); in print_probe_args()
268 if (likely(!a->count)) { in print_probe_args()
269 if (!a->type->print(s, data + a->offset, field)) in print_probe_args()
274 p = data + a->offset; in print_probe_args()
275 for (j = 0; j < a->count; j++) { in print_probe_args()
276 if (!a->type->print(s, p, field)) in print_probe_args()
278 trace_seq_putc(s, j == a->count - 1 ? '}' : ','); in print_probe_args()
279 p += a->type->size; in print_probe_args()
Dtrace_branch.c337 const struct ftrace_branch_data *a = p1; in annotated_branch_stat_cmp() local
342 percent_a = get_incorrect_percent(a); in annotated_branch_stat_cmp()
350 if (a->incorrect < b->incorrect) in annotated_branch_stat_cmp()
352 if (a->incorrect > b->incorrect) in annotated_branch_stat_cmp()
360 if (a->correct > b->correct) in annotated_branch_stat_cmp()
362 if (a->correct < b->correct) in annotated_branch_stat_cmp()
Dtrace_hwlat.c159 #define time_sub(a, b) ((a) - (b)) argument
160 #define init_time(a, b) (a = b) argument
161 #define time_u64(a) a argument
/kernel/
DKconfig.preempt15 Select this option if you are building a kernel for a server or
30 This allows reaction to interactive events by allowing a
32 is in kernel mode executing a system call. This allows
36 Select this if you are building a kernel for a desktop system.
46 all kernel code (that is not executing in a critical section)
48 permitting a low priority process to be preempted involuntarily
49 even if it is in kernel mode executing a system call and would
50 otherwise not be about to reach a natural preemption point.
53 and a slight runtime overhead to kernel code.
55 Select this if you are building a kernel for a desktop or
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DKconfig.hz13 a fast response for user interaction and that may experience bus
14 contention and cacheline bounces as a result of timer interrupts.
23 100 Hz is a typical choice for servers, SMP and NUMA systems
30 250 Hz is a good compromise choice allowing server performance
38 300 Hz is a good compromise choice allowing server performance
Dauditfilter.c696 static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) in audit_compare_rule() argument
700 if (a->flags != b->flags || in audit_compare_rule()
701 a->pflags != b->pflags || in audit_compare_rule()
702 a->listnr != b->listnr || in audit_compare_rule()
703 a->action != b->action || in audit_compare_rule()
704 a->field_count != b->field_count) in audit_compare_rule()
707 for (i = 0; i < a->field_count; i++) { in audit_compare_rule()
708 if (a->fields[i].type != b->fields[i].type || in audit_compare_rule()
709 a->fields[i].op != b->fields[i].op) in audit_compare_rule()
712 switch(a->fields[i].type) { in audit_compare_rule()
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Dstatic_call_inline.c67 const struct static_call_site *a = _a; in static_call_site_cmp() local
69 const struct static_call_key *key_a = static_call_key(a); in static_call_site_cmp()
84 struct static_call_site *a = _a; in static_call_site_swap() local
86 struct static_call_site tmp = *a; in static_call_site_swap()
88 a->addr = b->addr - delta; in static_call_site_swap()
89 a->key = b->key - delta; in static_call_site_swap()
Dgroups.c78 kgid_t a = *(kgid_t *)_a; in gid_cmp() local
81 return gid_gt(a, b) - gid_lt(a, b); in gid_cmp()
Dcred.c632 int cred_fscmp(const struct cred *a, const struct cred *b) in cred_fscmp() argument
637 if (a == b) in cred_fscmp()
639 if (uid_lt(a->fsuid, b->fsuid)) in cred_fscmp()
641 if (uid_gt(a->fsuid, b->fsuid)) in cred_fscmp()
644 if (gid_lt(a->fsgid, b->fsgid)) in cred_fscmp()
646 if (gid_gt(a->fsgid, b->fsgid)) in cred_fscmp()
649 ga = a->group_info; in cred_fscmp()
/kernel/power/
DKconfig30 user-space before invoking suspend. There's a run-time switch
71 It also works with swap files to a limited extent (for details see
79 will get corrupted in a nasty way.
81 For more information take a look at <file:Documentation/power/swsusp.rst>.
101 to-disk implementation will look for a suspended disk image.
104 It should be a valid swap partition (at least for now) that is turned
113 Note there is currently not a way to specify which device to save the
135 If an arch can suspend (for suspend, hibernate, kexec, etc) on a
143 Allow the kernel to trigger a system transition into a global sleep
151 objects with the help of a sysfs-based interface.
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/kernel/rcu/
DKconfig.debug18 need to be converted to pass a lockdep expression. To prevent
36 This option provides a kernel module that runs performance
42 Say M if you want the RCU performance tests to build as a module.
55 This option provides a kernel module that runs torture tests
61 Say M if you want the RCU torture tests to build as a module.
74 This option provides a kernel module that runs performance tests
80 Say M if you want to build it as a module instead.
89 If a given RCU grace period extends more than the specified
90 number of seconds, a CPU stall warning is printed. If the
DKconfig83 This option enables a task-based RCU implementation that uses
91 This option enables a task-based RCU implementation that uses
101 This option enables a task-based RCU implementation that uses
135 Select a specific number if testing RCU itself.
160 fanout to a large number will likely cause problematic
164 Select a specific number if testing RCU itself.
211 a given grace period before priority-boosting preempted RCU
218 bool "Perform RCU expedited work in a real-time kthread"
247 such CPU, a kthread ("rcuox/N") will be created to invoke
266 RCU grace periods. Given that a reasonable setting of
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/kernel/time/
Dtimeconst.bc5 define gcd(a,b) {
9 b = a % b;
10 a = t;
12 return a;
20 /* Adjustment factor when a ceiling value is used. Use as:
29 /* Compute the appropriate mul/adj values as well as a shift count,
31 a shift value will be correct in the signed integer range and off
DKconfig33 # Architecture can handle broadcast in a driver-agnostic way
96 This option keeps the tick running periodically at a constant
103 This option enables a tickless idle system: timer interrupts
124 the CPU is running tasks. Typically this requires running a single
136 If you're a distro say Y.
173 We keep it around for a little while to enforce backward
/kernel/dma/
DKconfig87 This enables support for restricted DMA pools which provide a level of
98 # The only thing that is really required is a way to set an uncached bit
169 Allocator as a percentage of the total memory in the system.
198 size. This works well for buffers up to a few hundreds kilobytes, but
199 for larger buffers it just a memory waste. With this parameter you can
202 expressed as a power of two multiplied by the PAGE_SIZE.
220 This option causes a performance degradation. Use only if you want to
236 preparing literal scatter-gather descriptors, where there is a risk of
/kernel/locking/
Dww_mutex.h228 __ww_ctx_less(struct ww_acquire_ctx *a, struct ww_acquire_ctx *b) in __ww_ctx_less() argument
237 int a_prio = a->task->prio; in __ww_ctx_less()
252 a->task->dl.deadline)) in __ww_ctx_less()
255 if (dl_time_before(a->task->dl.deadline, in __ww_ctx_less()
265 return (signed long)(a->stamp - b->stamp) > 0; in __ww_ctx_less()
/kernel/gcov/
DKconfig19 directories, add a line similar to the following to the respective
22 For a single file (e.g. main.o):
52 Note that a kernel compiled with profiling flags will be significantly
/kernel/bpf/preload/
DMakefile4 LIBBPF_A = $(obj)/libbpf.a
11 $(Q)$(MAKE) -C $(LIBBPF_SRCS) O=$(LIBBPF_OUT)/ OUTPUT=$(LIBBPF_OUT)/ $(LIBBPF_OUT)/libbpf.a
/kernel/livepatch/
DKconfig17 This option has no runtime impact until a kernel "patch"
19 a patch, causing calls to patched functions to be redirected
/kernel/kcsan/
Ddebugfs.c97 const unsigned long a = *(const unsigned long *)rhs; in cmp_filterlist_addrs() local
100 return a < b ? -1 : a == b ? 0 : 1; in cmp_filterlist_addrs()

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