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Subject[PATCH 4/4] arm64: advertise CPU features for modalias matching
Date
This enables the generic implementation in drivers/base/cpu.c
that allows modules to be loaded automatically based on the
optional features supported (and advertised over udev) by the
CPU.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
arch/arm64/Kconfig | 3 +++
arch/arm64/kernel/setup.c | 20 ++++++++++++++++++++
2 files changed, 23 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c044548..50cd97f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -202,6 +202,9 @@ config ARCH_WANT_HUGE_PMD_SHARE
config HAVE_ARCH_TRANSPARENT_HUGEPAGE
def_bool y

+config ARCH_HAS_CPU_AUTOPROBE
+ def_bool y
+
source "mm/Kconfig"

config XEN_DOM0
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 780a7aa..4774304 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -403,3 +403,23 @@ const struct seq_operations cpuinfo_op = {
.stop = c_stop,
.show = c_show
};
+
+ssize_t arch_print_cpu_modalias(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned int caps;
+ ssize_t n;
+ int i;
+
+ /*
+ * With 32 features maximum (taking 5 bytes each to print), we don't
+ * need to worry about overrunning the PAGE_SIZE sized buffer.
+ */
+ n = sprintf(buf, "cpu:type:arm64:feature:");
+ for (caps = elf_hwcap, i = 0; caps; caps >>= 1, i++)
+ if (caps & 1)
+ n += sprintf(&buf[n], ",%04X", i);
+ buf[n++] = '\n';
+ return n;
+}
--
1.8.3.2


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