* [PULL] : clockevents/clocksource fixes for 4.8
@ 2016-08-17 10:17 Daniel Lezcano
2016-08-17 10:21 ` [PATCH 1/3] clocksource/drivers/time-armada-370-xp: Fix the clock reference Daniel Lezcano
0 siblings, 1 reply; 7+ messages in thread
From: Daniel Lezcano @ 2016-08-17 10:17 UTC (permalink / raw)
To: Ingo Molnar
Cc: Thomas Gleixner, Linux Kernel Mailing List, Arnd Bergmann,
Gregory Clement, Paul Gortmaker
Hi Ingo,
this pull request for tip/timers/urgent contains two critical fixes and
one spurious compiler warning.
- Change the get_counter error handling function in order to prevent a
warning generated by gcc for the kona driver (Arnd Bergman)
- Fix a wrong clock reference leading to a kernel hang and slow bootup.
The init function conversion introduced a regression by taking the wrong
clock on armada-370-xp (Gregory Clement)
- Fix the init function prototype to return int on the mips-gic-driver
(Paul Gortmaker)
Thanks !
-- Daniel
The following changes since commit 1f3b0f8243cb934307f59bd4d8e43b868e61d4d9:
tick/nohz: Optimize nohz idle enter (2016-07-19 13:48:24 +0200)
are available in the git repository at:
ssh://git@git.linaro.org/people/daniel.lezcano/linux.git
clockevents/4.8-fixes
for you to fetch changes up to 394bc60a7ce8d4aa0f5b83b7e121dcdb393739d1:
clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init
return int (2016-08-17 07:36:32 +0200)
----------------------------------------------------------------
Arnd Bergmann (1):
clocksource/drivers/kona: Fix get_counter error handling
Gregory CLEMENT (1):
clocksource/drivers/time-armada-370-xp: Fix the clock reference
Paul Gortmaker (1):
clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init
return int
drivers/clocksource/bcm_kona_timer.c | 16 ++++++++++------
drivers/clocksource/mips-gic-timer.c | 2 +-
drivers/clocksource/time-armada-370-xp.c | 1 -
3 files changed, 11 insertions(+), 8 deletions(-)
--
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^ permalink raw reply [flat|nested] 7+ messages in thread* [PATCH 1/3] clocksource/drivers/time-armada-370-xp: Fix the clock reference 2016-08-17 10:17 [PULL] : clockevents/clocksource fixes for 4.8 Daniel Lezcano @ 2016-08-17 10:21 ` Daniel Lezcano 2016-08-17 10:21 ` [PATCH 2/3] clocksource/drivers/kona: Fix get_counter error handling Daniel Lezcano ` (2 more replies) 0 siblings, 3 replies; 7+ messages in thread From: Daniel Lezcano @ 2016-08-17 10:21 UTC (permalink / raw) To: mingo; +Cc: tglx, linux-kernel, Gregory CLEMENT, Stefan Roese, Ralph Sennhauser From: Gregory CLEMENT <gregory.clement@free-electrons.com> While converting the init function to return an error, the wrong clock was get. This lead to wrong clock rate and slow down the kernel. For example, before the patch a typical boot was around 15s after it was 1 minute slower. Fixes: 12549e27c63c ("clocksource/drivers/time-armada-370-xp: Convert init function to return error") Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Tested-by: Stefan Roese <sr@denx.de> Tested-by: Ralph Sennhauser <ralph.sennhauser@gmail.com> --- drivers/clocksource/time-armada-370-xp.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c index 20ec066..9872992 100644 --- a/drivers/clocksource/time-armada-370-xp.c +++ b/drivers/clocksource/time-armada-370-xp.c @@ -357,7 +357,6 @@ static int __init armada_xp_timer_init(struct device_node *np) struct clk *clk = of_clk_get_by_name(np, "fixed"); int ret; - clk = of_clk_get(np, 0); if (IS_ERR(clk)) { pr_err("Failed to get clock"); return PTR_ERR(clk); -- 1.9.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH 2/3] clocksource/drivers/kona: Fix get_counter error handling 2016-08-17 10:21 ` [PATCH 1/3] clocksource/drivers/time-armada-370-xp: Fix the clock reference Daniel Lezcano @ 2016-08-17 10:21 ` Daniel Lezcano 2016-08-17 13:38 ` [tip:timers/urgent] clocksource/drivers/kona: Fix get_counter() " tip-bot for Arnd Bergmann 2016-08-17 10:21 ` [PATCH 3/3] clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init return int Daniel Lezcano 2016-08-17 13:37 ` [tip:timers/urgent] clocksource/drivers/time-armada-370-xp: Fix the clock reference tip-bot for Gregory CLEMENT 2 siblings, 1 reply; 7+ messages in thread From: Daniel Lezcano @ 2016-08-17 10:21 UTC (permalink / raw) To: mingo Cc: tglx, linux-kernel, Arnd Bergmann, Ray Jui, bcm-kernel-feedback-list From: Arnd Bergmann <arnd@arndb.de> I could not figure out why, but gcc cannot prove that the kona_timer_init function always initializes its two outputs, and we get a warning for the use of the 'lsw' variable later, which is obviously correct. drivers/clocksource/bcm_kona_timer.c: In function 'kona_timer_init': drivers/clocksource/bcm_kona_timer.c:119:13: error: 'lsw' may be used uninitialized in this function [-Werror=maybe-uninitialized] Slightly reordering the loop makes the warning disappear, after it becomes more obvious to the compiler that the loop is always entered on the first iteration. As pointed out by Ray Jui, there is a related problem in the way we deal with the loop running into the limit, as we just keep going there with an invalid counter data, so instead we now propagate a -ETIMEDOUT result to the caller. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Link: https://patchwork.kernel.org/patch/9174261/ Acked-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> --- drivers/clocksource/bcm_kona_timer.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c index 7e3fd37..92f6e4d 100644 --- a/drivers/clocksource/bcm_kona_timer.c +++ b/drivers/clocksource/bcm_kona_timer.c @@ -66,10 +66,10 @@ static void kona_timer_disable_and_clear(void __iomem *base) } -static void +static int kona_timer_get_counter(void __iomem *timer_base, uint32_t *msw, uint32_t *lsw) { - int loop_limit = 4; + int loop_limit = 3; /* * Read 64-bit free running counter @@ -83,18 +83,19 @@ kona_timer_get_counter(void __iomem *timer_base, uint32_t *msw, uint32_t *lsw) * if new hi-word is equal to previously read hi-word then stop. */ - while (--loop_limit) { + do { *msw = readl(timer_base + KONA_GPTIMER_STCHI_OFFSET); *lsw = readl(timer_base + KONA_GPTIMER_STCLO_OFFSET); if (*msw == readl(timer_base + KONA_GPTIMER_STCHI_OFFSET)) break; - } + } while (--loop_limit); if (!loop_limit) { pr_err("bcm_kona_timer: getting counter failed.\n"); pr_err(" Timer will be impacted\n"); + return -ETIMEDOUT; } - return; + return 0; } static int kona_timer_set_next_event(unsigned long clc, @@ -112,8 +113,11 @@ static int kona_timer_set_next_event(unsigned long clc, uint32_t lsw, msw; uint32_t reg; + int ret; - kona_timer_get_counter(timers.tmr_regs, &msw, &lsw); + ret = kona_timer_get_counter(timers.tmr_regs, &msw, &lsw); + if (ret) + return ret; /* Load the "next" event tick value */ writel(lsw + clc, timers.tmr_regs + KONA_GPTIMER_STCM0_OFFSET); -- 1.9.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [tip:timers/urgent] clocksource/drivers/kona: Fix get_counter() error handling 2016-08-17 10:21 ` [PATCH 2/3] clocksource/drivers/kona: Fix get_counter error handling Daniel Lezcano @ 2016-08-17 13:38 ` tip-bot for Arnd Bergmann 0 siblings, 0 replies; 7+ messages in thread From: tip-bot for Arnd Bergmann @ 2016-08-17 13:38 UTC (permalink / raw) To: linux-tip-commits Cc: mingo, ray.jui, peterz, daniel.lezcano, arnd, torvalds, tglx, linux-kernel, hpa Commit-ID: 16c8eba0fe01e03317f48868105103a8f5938e85 Gitweb: http://git.kernel.org/tip/16c8eba0fe01e03317f48868105103a8f5938e85 Author: Arnd Bergmann <arnd@arndb.de> AuthorDate: Wed, 17 Aug 2016 12:21:34 +0200 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 17 Aug 2016 13:08:31 +0200 clocksource/drivers/kona: Fix get_counter() error handling I could not figure out why, but GCC cannot prove that the kona_timer_init() function always initializes its two outputs, and we get a warning for the use of the 'lsw' variable later, which is obviously correct. drivers/clocksource/bcm_kona_timer.c: In function 'kona_timer_init': drivers/clocksource/bcm_kona_timer.c:119:13: error: 'lsw' may be used uninitialized in this function [-Werror=maybe-uninitialized] Slightly reordering the loop makes the warning disappear, after it becomes more obvious to the compiler that the loop is always entered on the first iteration. As pointed out by Ray Jui, there is a related problem in the way we deal with the loop running into the limit, as we just keep going there with an invalid counter data, so instead we now propagate a -ETIMEDOUT result to the caller. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Ray Jui <ray.jui@broadcom.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: bcm-kernel-feedback-list@broadcom.com Link: http://lkml.kernel.org/r/1471429296-9053-2-git-send-email-daniel.lezcano@linaro.org Link: https://patchwork.kernel.org/patch/9174261/ Signed-off-by: Ingo Molnar <mingo@kernel.org> --- drivers/clocksource/bcm_kona_timer.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c index 7e3fd37..92f6e4d 100644 --- a/drivers/clocksource/bcm_kona_timer.c +++ b/drivers/clocksource/bcm_kona_timer.c @@ -66,10 +66,10 @@ static void kona_timer_disable_and_clear(void __iomem *base) } -static void +static int kona_timer_get_counter(void __iomem *timer_base, uint32_t *msw, uint32_t *lsw) { - int loop_limit = 4; + int loop_limit = 3; /* * Read 64-bit free running counter @@ -83,18 +83,19 @@ kona_timer_get_counter(void __iomem *timer_base, uint32_t *msw, uint32_t *lsw) * if new hi-word is equal to previously read hi-word then stop. */ - while (--loop_limit) { + do { *msw = readl(timer_base + KONA_GPTIMER_STCHI_OFFSET); *lsw = readl(timer_base + KONA_GPTIMER_STCLO_OFFSET); if (*msw == readl(timer_base + KONA_GPTIMER_STCHI_OFFSET)) break; - } + } while (--loop_limit); if (!loop_limit) { pr_err("bcm_kona_timer: getting counter failed.\n"); pr_err(" Timer will be impacted\n"); + return -ETIMEDOUT; } - return; + return 0; } static int kona_timer_set_next_event(unsigned long clc, @@ -112,8 +113,11 @@ static int kona_timer_set_next_event(unsigned long clc, uint32_t lsw, msw; uint32_t reg; + int ret; - kona_timer_get_counter(timers.tmr_regs, &msw, &lsw); + ret = kona_timer_get_counter(timers.tmr_regs, &msw, &lsw); + if (ret) + return ret; /* Load the "next" event tick value */ writel(lsw + clc, timers.tmr_regs + KONA_GPTIMER_STCM0_OFFSET); ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH 3/3] clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init return int 2016-08-17 10:21 ` [PATCH 1/3] clocksource/drivers/time-armada-370-xp: Fix the clock reference Daniel Lezcano 2016-08-17 10:21 ` [PATCH 2/3] clocksource/drivers/kona: Fix get_counter error handling Daniel Lezcano @ 2016-08-17 10:21 ` Daniel Lezcano 2016-08-17 13:38 ` [tip:timers/urgent] clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init() " tip-bot for Paul Gortmaker 2016-08-17 13:37 ` [tip:timers/urgent] clocksource/drivers/time-armada-370-xp: Fix the clock reference tip-bot for Gregory CLEMENT 2 siblings, 1 reply; 7+ messages in thread From: Daniel Lezcano @ 2016-08-17 10:21 UTC (permalink / raw) To: mingo; +Cc: tglx, linux-kernel, Paul Gortmaker, linux-mips From: Paul Gortmaker <paul.gortmaker@windriver.com> In commit d8152bf85d2c057fc39c3e20a4d623f524d9f09c: ("clocksource/drivers/mips-gic-timer: Convert init function to return error") several return values were added to a void function resulting in: clocksource/mips-gic-timer.c: In function 'gic_clocksource_of_init': clocksource/mips-gic-timer.c:175:3: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:183:4: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:190:3: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:195:3: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:200:3: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:211:2: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c: At top level: clocksource/mips-gic-timer.c:213:1: warning: comparison of distinct pointer types lacks a cast [enabled by default] clocksource/mips-gic-timer.c: In function 'gic_clocksource_of_init': clocksource/mips-gic-timer.c:183:18: warning: ignoring return value of 'PTR_ERR', declared with attribute warn_unused_result [-Wunused-result] Given that the addition of the return values was intentional, it seems that the conversion of the containing function from void to int was simply overlooked. Fixes: d8152bf85d2c ("clocksource/drivers/mips-gic-timer: Convert init function to return error") Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-mips@linux-mips.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> --- drivers/clocksource/mips-gic-timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c index 1572c7a..2577a2f 100644 --- a/drivers/clocksource/mips-gic-timer.c +++ b/drivers/clocksource/mips-gic-timer.c @@ -176,7 +176,7 @@ void __init gic_clocksource_init(unsigned int frequency) gic_start_count(); } -static void __init gic_clocksource_of_init(struct device_node *node) +static int __init gic_clocksource_of_init(struct device_node *node) { struct clk *clk; int ret; -- 1.9.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [tip:timers/urgent] clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init() return int 2016-08-17 10:21 ` [PATCH 3/3] clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init return int Daniel Lezcano @ 2016-08-17 13:38 ` tip-bot for Paul Gortmaker 0 siblings, 0 replies; 7+ messages in thread From: tip-bot for Paul Gortmaker @ 2016-08-17 13:38 UTC (permalink / raw) To: linux-tip-commits Cc: linux-kernel, tglx, peterz, torvalds, mingo, paul.gortmaker, daniel.lezcano, hpa Commit-ID: be5769e2061ac40b32daa83e28e1c4aac7133511 Gitweb: http://git.kernel.org/tip/be5769e2061ac40b32daa83e28e1c4aac7133511 Author: Paul Gortmaker <paul.gortmaker@windriver.com> AuthorDate: Wed, 17 Aug 2016 12:21:35 +0200 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 17 Aug 2016 13:08:32 +0200 clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init() return int In commit: d8152bf85d2c0 ("clocksource/drivers/mips-gic-timer: Convert init function to return error") several return values were added to a void function resulting in the following warnings: clocksource/mips-gic-timer.c: In function 'gic_clocksource_of_init': clocksource/mips-gic-timer.c:175:3: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:183:4: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:190:3: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:195:3: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:200:3: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c:211:2: warning: 'return' with a value, in function returning void [enabled by default] clocksource/mips-gic-timer.c: At top level: clocksource/mips-gic-timer.c:213:1: warning: comparison of distinct pointer types lacks a cast [enabled by default] clocksource/mips-gic-timer.c: In function 'gic_clocksource_of_init': clocksource/mips-gic-timer.c:183:18: warning: ignoring return value of 'PTR_ERR', declared with attribute warn_unused_result [-Wunused-result] Given that the addition of the return values was intentional, it seems that the conversion of the containing function from void to int was simply overlooked. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mips@linux-mips.org Fixes: d8152bf85d2c ("clocksource/drivers/mips-gic-timer: Convert init function to return error") Link: http://lkml.kernel.org/r/1471429296-9053-3-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org> --- drivers/clocksource/mips-gic-timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c index d91e872..b4b3ab5 100644 --- a/drivers/clocksource/mips-gic-timer.c +++ b/drivers/clocksource/mips-gic-timer.c @@ -164,7 +164,7 @@ void __init gic_clocksource_init(unsigned int frequency) gic_start_count(); } -static void __init gic_clocksource_of_init(struct device_node *node) +static int __init gic_clocksource_of_init(struct device_node *node) { struct clk *clk; int ret; ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [tip:timers/urgent] clocksource/drivers/time-armada-370-xp: Fix the clock reference 2016-08-17 10:21 ` [PATCH 1/3] clocksource/drivers/time-armada-370-xp: Fix the clock reference Daniel Lezcano 2016-08-17 10:21 ` [PATCH 2/3] clocksource/drivers/kona: Fix get_counter error handling Daniel Lezcano 2016-08-17 10:21 ` [PATCH 3/3] clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init return int Daniel Lezcano @ 2016-08-17 13:37 ` tip-bot for Gregory CLEMENT 2 siblings, 0 replies; 7+ messages in thread From: tip-bot for Gregory CLEMENT @ 2016-08-17 13:37 UTC (permalink / raw) To: linux-tip-commits Cc: mingo, ralph.sennhauser, daniel.lezcano, linux-kernel, sr, tglx, hpa, peterz, torvalds, gregory.clement Commit-ID: 0e62fd836e4c2908cc1e32c68806529b4f859955 Gitweb: http://git.kernel.org/tip/0e62fd836e4c2908cc1e32c68806529b4f859955 Author: Gregory CLEMENT <gregory.clement@free-electrons.com> AuthorDate: Wed, 17 Aug 2016 12:21:33 +0200 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 17 Aug 2016 13:08:31 +0200 clocksource/drivers/time-armada-370-xp: Fix the clock reference While converting the init function to return an error, the wrong clock was get. This leads to the wrong clock rate and slows down the kernel. For example, it affects typical boot time: - without fix: over 1 minute - with fix: 15 seconds Tested-by: Stefan Roese <sr@denx.de> Tested-by: Ralph Sennhauser <ralph.sennhauser@gmail.com> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 12549e27c63c ("clocksource/drivers/time-armada-370-xp: Convert init function to return error") Link: http://lkml.kernel.org/r/1471429296-9053-1-git-send-email-daniel.lezcano@linaro.org [ Refined the changelog. ] Signed-off-by: Ingo Molnar <mingo@kernel.org> --- drivers/clocksource/time-armada-370-xp.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c index 719b478..3c39e6f 100644 --- a/drivers/clocksource/time-armada-370-xp.c +++ b/drivers/clocksource/time-armada-370-xp.c @@ -338,7 +338,6 @@ static int __init armada_xp_timer_init(struct device_node *np) struct clk *clk = of_clk_get_by_name(np, "fixed"); int ret; - clk = of_clk_get(np, 0); if (IS_ERR(clk)) { pr_err("Failed to get clock"); return PTR_ERR(clk); ^ permalink raw reply related [flat|nested] 7+ messages in thread
end of thread, other threads:[~2016-08-17 13:39 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2016-08-17 10:17 [PULL] : clockevents/clocksource fixes for 4.8 Daniel Lezcano 2016-08-17 10:21 ` [PATCH 1/3] clocksource/drivers/time-armada-370-xp: Fix the clock reference Daniel Lezcano 2016-08-17 10:21 ` [PATCH 2/3] clocksource/drivers/kona: Fix get_counter error handling Daniel Lezcano 2016-08-17 13:38 ` [tip:timers/urgent] clocksource/drivers/kona: Fix get_counter() " tip-bot for Arnd Bergmann 2016-08-17 10:21 ` [PATCH 3/3] clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init return int Daniel Lezcano 2016-08-17 13:38 ` [tip:timers/urgent] clocksource/drivers/mips-gic-timer: Make gic_clocksource_of_init() " tip-bot for Paul Gortmaker 2016-08-17 13:37 ` [tip:timers/urgent] clocksource/drivers/time-armada-370-xp: Fix the clock reference tip-bot for Gregory CLEMENT
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