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Date:   Mon, 16 May 2022 11:06:36 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@redhat.com>
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>
cc:     linux-kernel@vger.kernel.org
Subject: [PATCH] objtool: fix objtool regression on x32 systems
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The patch 4abff6d48dbc ("objtool: Fix code relocs vs weak symbols") makes
the kernel unbootable.  The patch c087c6e7b551 ("objtool: Fix type of
reloc::addend") attempts to fix it by replacing 'int' with 'long'.

However, we may be running on a system with x32 ABI and 'long' on x32 is
32-bit, thus the patch c087c6e7b551 doesn't really change anything and we
still end up with miscompiled kernel.  This patch replaces 'long' with
'long long', so that the 64-bit kernel is correctly compiled on a x32
system.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: 4abff6d48dbc ("objtool: Fix code relocs vs weak symbols")
Fixes: c087c6e7b551 ("objtool: Fix type of reloc::addend")

---
 tools/objtool/check.c               |    8 ++++----
 tools/objtool/elf.c                 |    2 +-
 tools/objtool/include/objtool/elf.h |    4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

Index: linux-2.6/tools/objtool/check.c
===================================================================
--- linux-2.6.orig/tools/objtool/check.c	2022-05-16 16:20:49.000000000 +0200
+++ linux-2.6/tools/objtool/check.c	2022-05-16 16:22:11.000000000 +0200
@@ -560,12 +560,12 @@ static int add_dead_ends(struct objtool_
 		else if (reloc->addend == reloc->sym->sec->sh.sh_size) {
 			insn = find_last_insn(file, reloc->sym->sec);
 			if (!insn) {
-				WARN("can't find unreachable insn at %s+0x%lx",
+				WARN("can't find unreachable insn at %s+0x%llx",
 				     reloc->sym->sec->name, reloc->addend);
 				return -1;
 			}
 		} else {
-			WARN("can't find unreachable insn at %s+0x%lx",
+			WARN("can't find unreachable insn at %s+0x%llx",
 			     reloc->sym->sec->name, reloc->addend);
 			return -1;
 		}
@@ -595,12 +595,12 @@ reachable:
 		else if (reloc->addend == reloc->sym->sec->sh.sh_size) {
 			insn = find_last_insn(file, reloc->sym->sec);
 			if (!insn) {
-				WARN("can't find reachable insn at %s+0x%lx",
+				WARN("can't find reachable insn at %s+0x%llx",
 				     reloc->sym->sec->name, reloc->addend);
 				return -1;
 			}
 		} else {
-			WARN("can't find reachable insn at %s+0x%lx",
+			WARN("can't find reachable insn at %s+0x%llx",
 			     reloc->sym->sec->name, reloc->addend);
 			return -1;
 		}
Index: linux-2.6/tools/objtool/elf.c
===================================================================
--- linux-2.6.orig/tools/objtool/elf.c	2022-05-16 16:20:49.000000000 +0200
+++ linux-2.6/tools/objtool/elf.c	2022-05-16 16:22:21.000000000 +0200
@@ -546,7 +546,7 @@ static struct section *elf_create_reloc_
 						int reltype);
 
 int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
-		  unsigned int type, struct symbol *sym, long addend)
+		  unsigned int type, struct symbol *sym, long long addend)
 {
 	struct reloc *reloc;
 
Index: linux-2.6/tools/objtool/include/objtool/elf.h
===================================================================
--- linux-2.6.orig/tools/objtool/include/objtool/elf.h	2022-05-16 16:07:54.000000000 +0200
+++ linux-2.6/tools/objtool/include/objtool/elf.h	2022-05-16 16:22:45.000000000 +0200
@@ -73,7 +73,7 @@ struct reloc {
 	struct symbol *sym;
 	unsigned long offset;
 	unsigned int type;
-	long addend;
+	long long addend;
 	int idx;
 	bool jump_table_start;
 };
@@ -135,7 +135,7 @@ struct elf *elf_open_read(const char *na
 struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr);
 
 int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
-		  unsigned int type, struct symbol *sym, long addend);
+		  unsigned int type, struct symbol *sym, long long addend);
 int elf_add_reloc_to_insn(struct elf *elf, struct section *sec,
 			  unsigned long offset, unsigned int type,
 			  struct section *insn_sec, unsigned long insn_off);