LoongArch: Fix bitflag conflict for TIF_FIXADE

After LoongArch was converted to use the generic TIF bits in commit
f9629891d407 ("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: f9629891d407 ("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>

diff --git a/arch/loongarch/include/asm/thread_info.h b/arch/loongarch/include/asm/thread_info.h
index def7cb14467ec655f487bab76c8bda26313803a7..4d7117fcdc78c0d2e722f9bcc7b9ac224686c103 100644 (file)
--- a/arch/loongarch/include/asm/thread_info.h
+++ b/arch/loongarch/include/asm/thread_info.h
@@ -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 */