Merge: x86, jump_label: Improve text patching and assembly code support

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/5875

JIRA: https://issues.redhat.com/browse/RHEL-68940
MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/5875
Omitted-fix: 213aa67 ("parisc: Delay write-protection until mark_rodata_ro() call")
Omitted-fix: 14ab479 ("net/tcp: Disable TCP-AO static key after RCU grace period")

The main focus of this MR is to backport various upstream patches related
to static_call/jump_label processing to fix potential issues in text
patching. It also includes more recent x86's alternative, callthunks,
percpu and asm related support headers to support better code patching
in x86 as well as easing backport of future x86 mitigation patches with
assembly code.

The last documentation patch backports the remaining pieces of commit
ff61f07 ("docs: move x86 documentation into Documentation/arch/") to
complete the migration of x86 documentation to Documentation/arch/x86 to
reduce conflicts in future backports.

Signed-off-by: Waiman Long <longman@redhat.com>

Approved-by: Herton R. Krzesinski <herton@redhat.com>
Approved-by: Phil Auld <pauld@redhat.com>
Approved-by: Eder Zulian <ezulian@redhat.com>
Approved-by: David Arcari <darcari@redhat.com>
Approved-by: Rafael Aquini <raquini@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Augusto Caringi <acaringi@redhat.com>

Author: caringi

Documentation/admin-guide/RAS/main.rst

@@ -3153,7 +3153,7 @@
 
 	mce		[X86-32] Machine Check Exception
 
-	mce=option	[X86-64] See Documentation/x86/x86_64/boot-options.rst
+	mce=option	[X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
 
 	md=		[HW] RAID subsystems devices and level
 			See Documentation/admin-guide/md.rst.
@@ -4615,7 +4615,7 @@
 			See Documentation/admin-guide/blockdev/paride.rst.
 
 	pirq=		[SMP,APIC] Manual mp-table setup
-			See Documentation/x86/i386/IO-APIC.rst.
+			See Documentation/arch/x86/i386/IO-APIC.rst.
 
 	plip=		[PPT,NET] Parallel port network link
 			Format: { parport<nr> | timid | 0 }
@@ -5897,7 +5897,7 @@
 
 	serialnumber	[BUGS=X86-32]
 
-	sev=option[,option...] [X86-64] See Documentation/x86/x86_64/boot-options.rst
+	sev=option[,option...] [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
 
 	shapers=	[NET]
 			Maximal number of shapers.