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LoongArch: Fix bitflag conflict for TIF_FIXADE

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After LoongArch was converted to use the generic TIF bits in commit
f9629891d4 ("loongarch: Use generic TIF bits"), its TIF_FIXADE flag
takes the same bit with TIF_RESTORE_SIGMASK in thread_info.flags.

Such conflict causes TIF_FIXADE being considered cleared when
TIF_RESTORE_SIGMASK is cleared during deliver of a signal. And since
TIF_FIXADE determines whether unaligned access emulation works for a
task, userspace making use of unaligned access will receive unexpected
SIGBUS (and likely terminate) after receiving its first signal.

This conflict looks like a simple typo, switch it to the free bit 19.

Fixes: f9629891d4 ("loongarch: Use generic TIF bits")
Signed-off-by: Yao Zi <ziyao@disroot.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Wentao Guan <guanwentao@uniontech.com>
This commit is contained in:
Yao Zi 2025-09-19 12:58:29 +00:00 committed by Thomas Gleixner
parent 41e871f2b6
commit 3ec09344b0
1 changed files with 1 additions and 1 deletions
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2
arch/loongarch/include/asm/thread_info.h
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@ -77,7 +77,7 @@ register unsigned long current_stack_pointer __asm__("$sp");
#define TIF_NOHZ 16 /* in adaptive nohz mode */
#define TIF_USEDFPU 17 /* FPU was used by this task this quantum (SMP) */
#define TIF_USEDSIMD 18 /* SIMD has been used this quantum */
#define TIF_FIXADE 10 /* Fix address errors in software */
#define TIF_FIXADE 19 /* Fix address errors in software */
#define TIF_LOGADE 20 /* Log address errors to syslog */
#define TIF_32BIT_REGS 21 /* 32-bit general purpose registers */
#define TIF_32BIT_ADDR 22 /* 32-bit address space */