restructure kernel builds into directories

Signed-off-by: Avi Deitcher <avi@deitcher.net>

kernel/5.11.x/patches/0001-include-uapi-linux-swab-Fix-potentially-missing-__al.patch

@@ -0,0 +1,55 @@
+From 3635a8090f2271103511b68a5853b1d7e0a925b5 Mon Sep 17 00:00:00 2001
+From: Matt Redfearn <matt.redfearn@mips.com>
+Date: Wed, 3 Jan 2018 09:57:30 +0000
+Subject: [PATCH] include/uapi/linux/swab: Fix potentially missing
+ __always_inline
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Commit bc27fb68aaad ("include/uapi/linux/byteorder, swab: force inlining
+of some byteswap operations") added __always_inline to swab functions
+and commit 283d75737837 ("uapi/linux/stddef.h: Provide __always_inline to
+userspace headers") added a definition of __always_inline for use in
+exported headers when the kernel's compiler.h is not available.
+
+However, since swab.h does not include stddef.h, if the header soup does
+not indirectly include it, the definition of __always_inline is missing,
+resulting in a compilation failure, which was observed compiling the
+perf tool using exported headers containing this commit:
+
+In file included from /usr/include/linux/byteorder/little_endian.h:12:0,
+                 from /usr/include/asm/byteorder.h:14,
+                 from tools/include/uapi/linux/perf_event.h:20,
+                 from perf.h:8,
+                 from builtin-bench.c:18:
+/usr/include/linux/swab.h:160:8: error: unknown type name ‘__always_inline’
+ static __always_inline __u16 __swab16p(const __u16 *p)
+
+Fix this by replacing the inclusion of linux/compiler.h with
+linux/stddef.h to ensure that we pick up that definition if required,
+without relying on it's indirect inclusion. compiler.h is then included
+indirectly, via stddef.h.
+
+Fixes: 283d75737837 ("uapi/linux/stddef.h: Provide __always_inline to userspace headers")
+Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
+---
+ include/uapi/linux/swab.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/uapi/linux/swab.h b/include/uapi/linux/swab.h
+index 7272f85d6d6a..3736f2fe1541 100644
+--- a/include/uapi/linux/swab.h
++++ b/include/uapi/linux/swab.h
+@@ -3,7 +3,7 @@
+ #define _UAPI_LINUX_SWAB_H
+ 
+ #include <linux/types.h>
+-#include <linux/compiler.h>
++#include <linux/stddef.h>
+ #include <asm/bitsperlong.h>
+ #include <asm/swab.h>
+ 
+-- 
+2.26.2
+

kernel/5.11.x/patches/0002-gcc12-subcmd-build-issues.patch

@@ -0,0 +1,58 @@
+From: Justin M. Forbes @ 2022-01-29  1:02 UTC (permalink / raw)
+  To: Justin M. Forbes, linux-kernel; +Cc: jmforbes, Jakub Jelinek
+
+While the current code builds fine with gcc 11, it does not with gcc 12,
+resulting in:
+
+In file included from help.c:12:
+In function 'xrealloc',
+    inlined from 'add_cmdname' at help.c:24:2:
+subcmd-util.h:56:23: error: pointer may be used after 'realloc' [-Werror=use-after-free]
+   56 |                 ret = realloc(ptr, size);
+      |                       ^~~~~~~~~~~~~~~~~~
+subcmd-util.h:52:21: note: call to 'realloc' here
+   52 |         void *ret = realloc(ptr, size);
+      |                     ^~~~~~~~~~~~~~~~~~
+subcmd-util.h:58:31: error: pointer may be used after 'realloc' [-Werror=use-after-free]
+   58 |                         ret = realloc(ptr, 1);
+      |                               ^~~~~~~~~~~~~~~
+subcmd-util.h:52:21: note: call to 'realloc' here
+   52 |         void *ret = realloc(ptr, size);
+      |                     ^~~~~~~~~~~~~~~~~~
+
+The was mentioned in upstream gcc bug
+https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104069 where it was
+determined that gcc was correct and the kernel needed to change.  This
+fixes that use-after-free and makes things build again.
+
+Signed-off-by: Justin M. Forbes <jforbes@fedoraproject.org>
+Cc: Jakub Jelinek <jakub@redhat.com>
+
+---
+ tools/lib/subcmd/subcmd-util.h | 9 ++++-----
+ 1 file changed, 4 insertions(+), 5 deletions(-)
+
+diff --git a/tools/lib/subcmd/subcmd-util.h b/tools/lib/subcmd/subcmd-util.h
+index 794a375dad36..7009fc176636 100644
+--- a/tools/lib/subcmd/subcmd-util.h
++++ b/tools/lib/subcmd/subcmd-util.h
+@@ -49,13 +49,12 @@ static NORETURN inline void die(const char *err, ...)
+
+ static inline void *xrealloc(void *ptr, size_t size)
+ {
+-	void *ret = realloc(ptr, size);
+-	if (!ret && !size)
+-		ret = realloc(ptr, 1);
++	void *ret;
++	if (!size)
++		size = 1;
++	ret = realloc(ptr, size);
+ 	if (!ret) {
+ 		ret = realloc(ptr, size);
+-		if (!ret && !size)
+-			ret = realloc(ptr, 1);
+ 		if (!ret)
+ 			die("Out of memory, realloc failed");
+ 	}
+-- 
+2.34.1