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8effeaaf2c
When debugging a kernel panic(), it can be useful to know which CPU features have been detected by the kernel, as some code paths can depend on these (and may have been patched at runtime). This patch adds a notifier to dump the detected CPU caps (as a hex string) at panic(), when we log other information useful for debugging. On a Juno R1 system running v4.12-rc5, this looks like: [ 615.431249] Kernel panic - not syncing: Fatal exception in interrupt [ 615.437609] SMP: stopping secondary CPUs [ 615.441872] Kernel Offset: disabled [ 615.445372] CPU features: 0x02086 [ 615.448522] Memory Limit: none A developer can decode this by looking at the corresponding <asm/cpucaps.h> bits. For example, the above decodes as: * bit 1: ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE * bit 2: ARM64_WORKAROUND_845719 * bit 7: ARM64_WORKAROUND_834220 * bit 13: ARM64_HAS_32BIT_EL0 Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Steve Capper <steve.capper@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> |
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