catfish: Add bluetooth_6lowpan

This is intended to be a first step to implementing a generic data
transfer profile over Bluetooth as described here:
AsteroidOS/asteroid-btsyncd#22

Signed-off-by: Ed Beroset <beroset@ieee.org>

meta-catfish/recipes-kernel/linux/linux-catfish/0007-Add-missing-BT_6LOWPAN-option-to-bluetooth-Kconfig.patch

@@ -0,0 +1,30 @@
+From 3ef5cd9eece497e5af800a66a6a2beb2e45c1f15 Mon Sep 17 00:00:00 2001
+From: Ed Beroset <beroset@ieee.org>
+Date: Fri, 6 Oct 2023 11:59:35 -0400
+Subject: [PATCH] Add missing BT_6LOWPAN option to bluetooth Kconfig
+
+This adds the BT_6LOWPAN option back in.  It may have been deleted by
+accident.
+
+Signed-off-by: Ed Beroset <beroset@ieee.org>
+---
+ net/bluetooth/Kconfig | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/net/bluetooth/Kconfig b/net/bluetooth/Kconfig
+index 81f837f6d934..b8c794b87523 100644
+--- a/net/bluetooth/Kconfig
++++ b/net/bluetooth/Kconfig
+@@ -58,6 +58,12 @@ config BT_LE
+ 	depends on BT
+ 	default y
+
++config BT_6LOWPAN
++	tristate "Bluetooth 6LoWPAN support"
++	depends on BT_LE && 6LOWPAN
++	help
++	  IPv6 compression over Bluetooth Low Energy.
++
+ config BT_SELFTEST
+ 	bool "Bluetooth self testing support"
+ 	depends on BT && DEBUG_KERNEL

meta-catfish/recipes-kernel/linux/linux-catfish/0008-Restore-bluetooth_6lowpan-to-Makefile.patch

@@ -0,0 +1,27 @@
+From 34215ae8e5e5edbaed72b120b167b2b6f120cd2b Mon Sep 17 00:00:00 2001
+From: Ed Beroset <beroset@ieee.org>
+Date: Fri, 6 Oct 2023 12:08:29 -0400
+Subject: [PATCH] Restore bluetooth_6lowpan to Makefile
+
+I'm not sure why or how this was removed, but it's required for using
+6lowpan over Bluetooth.
+
+Signed-off-by: Ed Beroset <beroset@ieee.org>
+---
+ net/bluetooth/Makefile | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/net/bluetooth/Makefile b/net/bluetooth/Makefile
+index c85a6afc6fe1..9a8ea232d28f 100644
+--- a/net/bluetooth/Makefile
++++ b/net/bluetooth/Makefile
+@@ -7,6 +7,9 @@ obj-$(CONFIG_BT_RFCOMM)	+= rfcomm/
+ obj-$(CONFIG_BT_BNEP)	+= bnep/
+ obj-$(CONFIG_BT_CMTP)	+= cmtp/
+ obj-$(CONFIG_BT_HIDP)	+= hidp/
++obj-$(CONFIG_BT_6LOWPAN) += bluetooth_6lowpan.o
++
++bluetooth_6lowpan-y := 6lowpan.o
+
+ bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \
+ 	hci_sock.o hci_sysfs.o l2cap_core.o l2cap_sock.o smp.o sco.o lib.o \

meta-catfish/recipes-kernel/linux/linux-catfish/0009-Move-const-to-the-right-location.patch

@@ -0,0 +1,27 @@
+From 36893966a1b412a67fcd50cb4979d1ca5ed23bdc Mon Sep 17 00:00:00 2001
+From: Ed Beroset <beroset@ieee.org>
+Date: Fri, 6 Oct 2023 21:04:29 -0400
+Subject: [PATCH] Move const to the right location
+
+This fixes a small bug in the code in which a duplicate const
+declaration was apparently intended to be a const pointer to a const
+location.
+
+Signed-off-by: Ed Beroset <beroset@ieee.org>
+---
+ include/linux/msm_mhi.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/linux/msm_mhi.h b/include/linux/msm_mhi.h
+index 08dc3a23abfa..a5ffa23a32d0 100644
+--- a/include/linux/msm_mhi.h
++++ b/include/linux/msm_mhi.h
+@@ -107,7 +107,7 @@ struct mhi_cb_info {
+
+ struct mhi_client_info_t {
+ 	enum MHI_CLIENT_CHANNEL chan;
+-	const struct device const *dev;
++	const struct device * const dev;
+ 	const char *node_name;
+ 	void (*mhi_client_cb)(struct mhi_cb_info *);
+ 	bool pre_allocate;

meta-catfish/recipes-kernel/linux/linux-catfish/0010-include-linux-module.h-copy-__init-__exit-attrs-to-i.patch

@@ -0,0 +1,78 @@
+From f9981ae000018596f86f6c4ecbda34aef0253e2d Mon Sep 17 00:00:00 2001
+From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
+Date: Wed, 6 Feb 2019 18:56:27 +0100
+Subject: [PATCH]  include/linux/module.h: copy __init/__exit attrs to
+ init/cleanup_module
+
+The upcoming GCC 9 release extends the -Wmissing-attributes warnings
+(enabled by -Wall) to C and aliases: it warns when particular function
+attributes are missing in the aliases but not in their target.
+
+In particular, it triggers for all the init/cleanup_module
+aliases in the kernel (defined by the module_init/exit macros),
+ending up being very noisy.
+
+These aliases point to the __init/__exit functions of a module,
+which are defined as __cold (among other attributes). However,
+the aliases themselves do not have the __cold attribute.
+
+Since the compiler behaves differently when compiling a __cold
+function as well as when compiling paths leading to calls
+to __cold functions, the warning is trying to point out
+the possibly-forgotten attribute in the alias.
+
+In order to keep the warning enabled, we decided to silence
+this case. Ideally, we would mark the aliases directly
+as __init/__exit. However, there are currently around 132 modules
+in the kernel which are missing __init/__exit in their init/cleanup
+functions (either because they are missing, or for other reasons,
+e.g. the functions being called from somewhere else); and
+a section mismatch is a hard error.
+
+A conservative alternative was to mark the aliases as __cold only.
+However, since we would like to eventually enforce __init/__exit
+to be always marked,  we chose to use the new __copy function
+attribute (introduced by GCC 9 as well to deal with this).
+With it, we copy the attributes used by the target functions
+into the aliases. This way, functions that were not marked
+as __init/__exit won't have their aliases marked either,
+and therefore there won't be a section mismatch.
+
+Note that the warning would go away marking either the extern
+declaration, the definition, or both. However, we only mark
+the definition of the alias, since we do not want callers
+(which only see the declaration) to be compiled as if the function
+was __cold (and therefore the paths leading to those calls
+would be assumed to be unlikely).
+
+Link: https://lore.kernel.org/lkml/20190123173707.GA16603@gmail.com/
+Link: https://lore.kernel.org/lkml/20190206175627.GA20399@gmail.com/
+Suggested-by: Martin Sebor <msebor@gcc.gnu.org>
+Acked-by: Jessica Yu <jeyu@kernel.org>
+Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
+
+Signed-off-by: Ed Beroset <beroset@ieee.org>
+---
+ include/linux/init.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/linux/init.h b/include/linux/init.h
+index 28ec4d128413..d68791117bd9 100644
+--- a/include/linux/init.h
++++ b/include/linux/init.h
+@@ -331,13 +331,13 @@ void __init parse_early_options(char *cmdline);
+ #define module_init(initfn)					\
+ 	static inline initcall_t __inittest(void)		\
+ 	{ return initfn; }					\
+-	int init_module(void) __attribute__((alias(#initfn)));
++	int init_module(void) __copy(initfn) __attribute__((alias(#initfn)));
+
+ /* This is only required if you want to be unloadable. */
+ #define module_exit(exitfn)					\
+ 	static inline exitcall_t __exittest(void)		\
+ 	{ return exitfn; }					\
+-	void cleanup_module(void) __attribute__((alias(#exitfn)));
++	void cleanup_module(void) __copy(exitfn)  __attribute__((alias(#exitfn)));
+
+ #define __setup_param(str, unique_id, fn)	/* nothing */
+ #define __setup(str, func) 			/* nothing */

meta-catfish/recipes-kernel/linux/linux-catfish/0011-Compiler-Attributes-add-support-for-__copy-gcc-9.patch

@@ -0,0 +1,99 @@
+From b97a52261d797f2731178416dafbad4d26dd0bf5 Mon Sep 17 00:00:00 2001
+From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
+Date: Fri, 6 Oct 2023 22:27:17 -0400
+Subject: [PATCH]  Compiler Attributes: add support for __copy (gcc >= 9)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From the GCC manual:
+
+  copy
+  copy(function)
+
+    The copy attribute applies the set of attributes with which function
+    has been declared to the declaration of the function to which
+    the attribute is applied. The attribute is designed for libraries
+    that define aliases or function resolvers that are expected
+    to specify the same set of attributes as their targets. The copy
+    attribute can be used with functions, variables, or types. However,
+    the kind of symbol to which the attribute is applied (either
+    function or variable) must match the kind of symbol to which
+    the argument refers. The copy attribute copies only syntactic and
+    semantic attributes but not attributes that affect a symbol’s
+    linkage or visibility such as alias, visibility, or weak.
+    The deprecated attribute is also not copied.
+
+  https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
+
+The upcoming GCC 9 release extends the -Wmissing-attributes warnings
+(enabled by -Wall) to C and aliases: it warns when particular function
+attributes are missing in the aliases but not in their target, e.g.:
+
+    void __cold f(void) {}
+    void __alias("f") g(void);
+
+diagnoses:
+
+    warning: 'g' specifies less restrictive attribute than
+    its target 'f': 'cold' [-Wmissing-attributes]
+
+Using __copy(f) we can copy the __cold attribute from f to g:
+
+    void __cold f(void) {}
+    void __copy(f) __alias("f") g(void);
+
+This attribute is most useful to deal with situations where an alias
+is declared but we don't know the exact attributes the target has.
+
+For instance, in the kernel, the widely used module_init/exit macros
+define the init/cleanup_module aliases, but those cannot be marked
+always as __init/__exit since some modules do not have their
+functions marked as such.
+
+Suggested-by: Martin Sebor <msebor@gcc.gnu.org>
+Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
+Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
+
+Link: https://github.com/torvalds/linux/commit/c0d9782f5b6d7157635ae2fd782a4b27d55a6013
+Link: https://github.com/ojeda/linux/commit/8803fd49f7f86efa39b60957c74ccf98690ae2ab
+
+Signed-off-by: Ed Beroset <beroset@ieee.org>
+---
+ include/linux/compiler.h | 23 +++++++++++++++++++++++
+ 1 file changed, 23 insertions(+)
+
+diff --git a/include/linux/compiler.h b/include/linux/compiler.h
+index 4c981adac770..682e8c0a95e5 100644
+--- a/include/linux/compiler.h
++++ b/include/linux/compiler.h
+@@ -50,6 +50,29 @@ extern void __chk_io_ptr(const volatile void __iomem *);
+
+ #ifdef __KERNEL__
+
++/*
++ * Minimal backport of compiler_attributes.h to add support for __copy
++ * to v4.9.y so that we can use it in init/exit_module to avoid
++ * -Werror=missing-attributes errors on GCC 9.
++ */
++#ifndef __has_attribute
++# define __has_attribute(x) __GCC4_has_attribute_##x
++# define __GCC4_has_attribute___copy__                0
++#endif
++
++/*
++ * Optional: only supported since gcc >= 9
++ * Optional: not supported by clang
++ * Optional: not supported by icc
++ *
++ *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-copy-function-attribute
++ */
++#if __has_attribute(__copy__)
++# define __copy(symbol)                 __attribute__((__copy__(symbol)))
++#else
++# define __copy(symbol)
++#endif
++
+ #ifdef __GNUC__
+ #include <linux/compiler-gcc.h>
+ #endif

meta-catfish/recipes-kernel/linux/linux-catfish/0012-Fix-alignment-of-struct-members.patch

@@ -0,0 +1,55 @@
+From 639c2a5098e96b510f7330e3084137bec0613985 Mon Sep 17 00:00:00 2001
+From: Ed Beroset <beroset@ieee.org>
+Date: Sat, 7 Oct 2023 11:42:34 -0400
+Subject: [PATCH] Fix alignment of struct members
+
+With newer versions (>9) of gcc, the compiler correctly warns that
+"taking address of packed member of 'struct diag_mempool_t' may result
+in an unaligned pointer value [-Waddress-of-packed-member]."
+
+A similar warning comes up for dci_pkt_req_entry_t.
+
+This removes the __packed attribute from both structs to address that
+problem.
+
+Signed-off-by: Ed Beroset <beroset@ieee.org>
+---
+ drivers/char/diag/diag_dci.h | 4 ++--
+ drivers/char/diag/diagmem.h  | 2 +-
+ 2 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/drivers/char/diag/diag_dci.h b/drivers/char/diag/diag_dci.h
+index a9e2d35cc50a..bf988c5fff23 100644
+--- a/drivers/char/diag/diag_dci.h
++++ b/drivers/char/diag/diag_dci.h
+@@ -95,7 +95,7 @@ struct dci_pkt_req_entry_t {
+ 	int uid;
+ 	int tag;
+ 	struct list_head track;
+-} __packed;
++};
+
+ struct diag_dci_reg_tbl_t {
+ 	int client_id;
+@@ -164,7 +164,7 @@ struct diag_dci_health_stats_proc {
+ 	int client_id;
+ 	struct diag_dci_health_stats health;
+ 	int proc;
+-} __packed;
++};
+
+ struct diag_dci_peripherals_t {
+ 	int proc;
+diff --git a/drivers/char/diag/diagmem.h b/drivers/char/diag/diagmem.h
+index d097a3799e9a..77ef3003559e 100644
+--- a/drivers/char/diag/diagmem.h
++++ b/drivers/char/diag/diagmem.h
+@@ -50,7 +50,7 @@ struct diag_mempool_t {
+ 	unsigned int poolsize;
+ 	int count;
+ 	spinlock_t lock;
+-} __packed;
++};
+
+ extern struct diag_mempool_t diag_mempools[NUM_MEMORY_POOLS];
+