From: Arnd Bergmann <arnd@kernel.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nathan Lynch <nathanl@linux.ibm.com>,
Arnd Bergmann <arnd@arndb.de>,
linuxppc-dev@lists.ozlabs.org, Hugh Dickins <hughd@google.com>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
linux-kernel@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>,
Maninder Singh <maninder1.s@samsung.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jiri Slaby <jirislaby@kernel.org>
Subject: [PATCH 1/2] powerpc: mark more local variables as volatile
Date: Wed, 9 Aug 2023 15:10:08 +0200 [thread overview]
Message-ID: <20230809131024.2039647-1-arnd@kernel.org> (raw)
From: Arnd Bergmann <arnd@arndb.de>
A while ago I created a2305e3de8193 ("powerpc: mark local variables
around longjmp as volatile") in order to allow building powerpc with
-Wextra enabled on gcc-11.
I tried this again with gcc-13 and found two more of the same issues,
presumably based on slightly different optimization paths being taken
here:
arch/powerpc/xmon/xmon.c:3306:27: error: variable 'mm' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered]
arch/powerpc/kexec/crash.c:353:22: error: variable 'i' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered]
I checked a bunch of randconfigs and found only these two, so just
address them the same way as the others.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/powerpc/kexec/crash.c | 2 +-
arch/powerpc/xmon/xmon.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kexec/crash.c b/arch/powerpc/kexec/crash.c
index 252724ed666a3..ef5c2d25ec397 100644
--- a/arch/powerpc/kexec/crash.c
+++ b/arch/powerpc/kexec/crash.c
@@ -350,7 +350,7 @@ EXPORT_SYMBOL(crash_shutdown_unregister);
void default_machine_crash_shutdown(struct pt_regs *regs)
{
- unsigned int i;
+ volatile unsigned int i;
int (*old_handler)(struct pt_regs *regs);
if (TRAP(regs) == INTERRUPT_SYSTEM_RESET)
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 3b6f524c790e3..9e12b75850d75 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3303,7 +3303,7 @@ static void show_pte(unsigned long addr)
{
unsigned long tskv = 0;
struct task_struct *volatile tsk = NULL;
- struct mm_struct *mm;
+ struct mm_struct *volatile mm;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
--
2.39.2
next reply other threads:[~2023-08-09 13:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-09 13:10 Arnd Bergmann [this message]
2023-08-09 13:10 ` [PATCH 2/2] powerpc: xmon: remove unused variables Arnd Bergmann
2023-08-09 13:17 ` [PATCH 1/2] powerpc: mark more local variables as volatile Christophe Leroy
2023-08-09 13:35 ` Arnd Bergmann
2023-08-23 11:55 ` Michael Ellerman
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