linux-kernel - [RFC PATCH 3/4] scripts/mod: add generic CPU features as module alias

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Date:	Thu,  7 Nov 2013 18:17:36 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, catalin.marinas@....com,
	will.deacon@....com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, steve.capper@...aro.org,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [RFC PATCH 3/4] scripts/mod: add generic CPU features as module alias

This implements the changes needed to turn CPU features
declared as being depended upon by modules into module aliases
in the .ko metadata.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
 include/linux/mod_devicetable.h   | 11 +++++++++++
 scripts/mod/devicetable-offsets.c |  3 +++
 scripts/mod/file2alias.c          | 10 ++++++++++
 3 files changed, 24 insertions(+)

diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 45e9214..e481796 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -564,6 +564,17 @@ struct x86_cpu_id {
 #define X86_MODEL_ANY  0
 #define X86_FEATURE_ANY 0	/* Same as FPU, you can't test for that */
 
+/*
+ * Generic table type for tracking CPU features.
+ * @feature:	the bit number of the feature (0 - 31)
+ *
+ * How the bit numbers map to actual CPU features is entirely up to the arch
+ */
+
+struct cpu_feature {
+	__u8	feature;
+};
+
 #define IPACK_ANY_FORMAT 0xff
 #define IPACK_ANY_ID (~0)
 struct ipack_device_id {
diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index bb5d115..f282516 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -174,6 +174,9 @@ int main(void)
 	DEVID_FIELD(x86_cpu_id, model);
 	DEVID_FIELD(x86_cpu_id, vendor);
 
+	DEVID(cpu_feature);
+	DEVID_FIELD(cpu_feature, feature);
+
 	DEVID(mei_cl_device_id);
 	DEVID_FIELD(mei_cl_device_id, name);
 
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 2370863..209cdb2 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1135,6 +1135,16 @@ static int do_x86cpu_entry(const char *filename, void *symval,
 }
 ADD_TO_DEVTABLE("x86cpu", x86_cpu_id, do_x86cpu_entry);
 
+/* LOOKS like cpu:feature:*FEAT* */
+static int do_cpu_entry(const char *filename, void *symval, char *alias)
+{
+	DEF_FIELD(symval, cpu_feature, feature);
+
+	sprintf(alias, "cpu:feature:*%02X*", feature);
+	return 1;
+}
+ADD_TO_DEVTABLE("cpu", cpu_feature, do_cpu_entry);
+
 /* Looks like: mei:S */
 static int do_mei_entry(const char *filename, void *symval,
 			char *alias)
-- 
1.8.3.2

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