The following commit has been merged into the timers/core branch of tip:
Commit-ID: 4441b976dfeff0d3579e8da3c0283300c618a553
Gitweb: https://git.kernel.org/tip/4441b976dfeff0d3579e8da3c0283300c618a553
Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
AuthorDate: Fri, 14 Feb 2025 15:43:33 +02:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 18 Feb 2025 10:12:49 +01:00
hrtimers: Replace hrtimer_clock_to_base_table with switch-case
Clang and GCC complain about overlapped initialisers in the
hrtimer_clock_to_base_table definition. With `make W=1` and CONFIG_WERROR=y
(which is default nowadays) this breaks the build:
CC kernel/time/hrtimer.o
kernel/time/hrtimer.c:124:21: error: initializer overrides prior initialization of this subobject [-Werror,-Winitializer-overrides]
124 | [CLOCK_REALTIME] = HRTIMER_BASE_REALTIME,
kernel/time/hrtimer.c:122:27: note: previous initialization is here
122 | [0 ... MAX_CLOCKS - 1] = HRTIMER_MAX_CLOCK_BASES,
(and similar for CLOCK_MONOTONIC, CLOCK_BOOTTIME, and CLOCK_TAI).
hrtimer_clockid_to_base(), which uses the table, is only used in
__hrtimer_init(), which is not a hotpath.
Therefore replace the table lookup with a switch case in
hrtimer_clockid_to_base() to avoid this warning.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20250214134424.3367619-1-andriy.shevchenko@xxxxxxxxxxxxxxx
---
kernel/time/hrtimer.c | 29 ++++++++++++-----------------
1 file changed, 12 insertions(+), 17 deletions(-)
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index deb1aa3..453dc76 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -117,16 +117,6 @@ DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
.csd = CSD_INIT(retrigger_next_event, NULL)
};
-static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
- /* Make sure we catch unsupported clockids */
- [0 ... MAX_CLOCKS - 1] = HRTIMER_MAX_CLOCK_BASES,
-
- [CLOCK_REALTIME] = HRTIMER_BASE_REALTIME,
- [CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC,
- [CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME,
- [CLOCK_TAI] = HRTIMER_BASE_TAI,
-};
-
static inline bool hrtimer_base_is_online(struct hrtimer_cpu_base *base)
{
if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
@@ -1587,14 +1577,19 @@ u64 hrtimer_next_event_without(const struct hrtimer *exclude)
static inline int hrtimer_clockid_to_base(clockid_t clock_id)
{
- if (likely(clock_id < MAX_CLOCKS)) {
- int base = hrtimer_clock_to_base_table[clock_id];
-
- if (likely(base != HRTIMER_MAX_CLOCK_BASES))
- return base;
+ switch (clock_id) {
+ case CLOCK_REALTIME:
+ return HRTIMER_BASE_REALTIME;
+ case CLOCK_MONOTONIC:
+ return HRTIMER_BASE_MONOTONIC;
+ case CLOCK_BOOTTIME:
+ return HRTIMER_BASE_BOOTTIME;
+ case CLOCK_TAI:
+ return HRTIMER_BASE_TAI;
+ default:
+ WARN(1, "Invalid clockid %d. Using MONOTONIC\n", clock_id);
+ return HRTIMER_BASE_MONOTONIC;
}
- WARN(1, "Invalid clockid %d. Using MONOTONIC\n", clock_id);
- return HRTIMER_BASE_MONOTONIC;
}
static enum hrtimer_restart hrtimer_dummy_timeout(struct hrtimer *unused)
|