Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'timers_urgent_for_v6.1_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fix from Borislav Petkov:
- Return the proper timer register width (31 bits) for a 32-bit signed
register in order to avoid a timer interrupt storm on ARM XGene-1
hardware running in NO_HZ mode
* tag 'timers_urgent_for_v6.1_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
clocksource/drivers/arm_arch_timer: Fix XGene-1 TVAL register math error
+5
-2
+5
-2
drivers/clocksource/arm_arch_timer.c
+5
-2
drivers/clocksource/arm_arch_timer.c
···
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/*
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* XGene-1 implements CVAL in terms of TVAL, meaning
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* that the maximum timer range is 32bit. Shame on them.
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+
*
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+
* Note that TVAL is signed, thus has only 31 of its
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+
* 32 bits to express magnitude.
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*/
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MIDR_ALL_VERSIONS(MIDR_CPU_MODEL(ARM_CPU_IMP_APM,
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APM_CPU_PART_POTENZA)),
···
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};
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if (is_midr_in_range_list(read_cpuid_id(), broken_cval_midrs)) {
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-
pr_warn_once("Broken CNTx_CVAL_EL1, limiting width to 32bits");
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-
return CLOCKSOURCE_MASK(32);
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+
pr_warn_once("Broken CNTx_CVAL_EL1, using 31 bit TVAL instead.\n");
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+
return CLOCKSOURCE_MASK(31);
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}
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#endif
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return CLOCKSOURCE_MASK(arch_counter_get_width());