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LoongArch: Fix build errors for CONFIG_RANDSTRUCT

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When CONFIG_RANDSTRUCT enabled, members of task_struct are randomized.
There is a chance that TASK_STACK_CANARY be out of 12bit immediate's
range and causes build errors. TASK_STACK_CANARY is naturally aligned,
so fix it by replacing ld.d/st.d with ldptr.d/stptr.d which have 14bit
immediates.

Cc: stable@vger.kernel.org
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511240656.0NaPcJs1-lkp@intel.com/
Suggested-by: Rui Wang <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2025-12-06 10:39:40 +08:00
parent 17fcc4bd7e
commit 3c250aecef
1 changed files with 2 additions and 2 deletions
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4
arch/loongarch/kernel/switch.S
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@ -25,8 +25,8 @@ SYM_FUNC_START(__switch_to)
stptr.d a4, a0, THREAD_SCHED_CFA
#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
la t7, __stack_chk_guard
LONG_L t8, a1, TASK_STACK_CANARY
LONG_S t8, t7, 0
ldptr.d t8, a1, TASK_STACK_CANARY
stptr.d t8, t7, 0
#endif
move tp, a2
cpu_restore_nonscratch a1