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From f562deb29bbccd6606b684105aa718ef263f274e Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@suse.com>
Date: Tue, 24 Sep 2024 14:58:58 +0200
Subject: [PATCH 20/56] x86: fix UP build with gcc14
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The complaint is:
In file included from ././include/xen/config.h:17,
from <command-line>:
arch/x86/smpboot.c: In function ‘link_thread_siblings.constprop’:
./include/asm-generic/percpu.h:16:51: error: array subscript [0, 0] is outside array bounds of ‘long unsigned int[1]’ [-Werror=array-bounds=]
16 | (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
./include/xen/compiler.h:140:29: note: in definition of macro ‘RELOC_HIDE’
140 | (typeof(ptr)) (__ptr + (off)); })
| ^~~
arch/x86/smpboot.c:238:27: note: in expansion of macro ‘per_cpu’
238 | cpumask_set_cpu(cpu2, per_cpu(cpu_sibling_mask, cpu1));
| ^~~~~~~
In file included from ./arch/x86/include/generated/asm/percpu.h:1,
from ./include/xen/percpu.h:30,
from ./arch/x86/include/asm/cpuid.h:9,
from ./arch/x86/include/asm/cpufeature.h:11,
from ./arch/x86/include/asm/system.h:6,
from ./include/xen/list.h:11,
from ./include/xen/mm.h:68,
from arch/x86/smpboot.c:12:
./include/asm-generic/percpu.h:12:22: note: while referencing ‘__per_cpu_offset’
12 | extern unsigned long __per_cpu_offset[NR_CPUS];
| ^~~~~~~~~~~~~~~~
Which I consider bogus in the first place ("array subscript [0, 0]" vs a
1-element array). Yet taking the experience from 99f942f3d410 ("Arm64:
adjust __irq_to_desc() to fix build with gcc14") I guessed that
switching function parameters to unsigned int (which they should have
been anyway) might help. And voilà ...
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: a2de7dc4d845738e734b10fce6550c89c6b1092c
master date: 2024-09-04 16:09:28 +0200
---
xen/arch/x86/smpboot.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
index 4c54ecbc91..f7078130cd 100644
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -226,7 +226,7 @@ static int booting_cpu;
/* CPUs for which sibling maps can be computed. */
static cpumask_t cpu_sibling_setup_map;
-static void link_thread_siblings(int cpu1, int cpu2)
+static void link_thread_siblings(unsigned int cpu1, unsigned int cpu2)
{
cpumask_set_cpu(cpu1, per_cpu(cpu_sibling_mask, cpu2));
cpumask_set_cpu(cpu2, per_cpu(cpu_sibling_mask, cpu1));
--
2.47.0
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