Merge tag 's390-6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 build fix from Heiko Carstens:

 - Workaround invalid gcc-11 out of bounds read warning caused by s390's
   S390_lowcore definition. This happens only with gcc 11.1.0 and
   11.2.0.

   The code which causes this warning will be gone with the next merge
   window. Therefore just replace the memcpy() with a for loop to get
   rid of the warning.

* tag 's390-6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390: workaround invalid gcc-11 out of bounds read warning

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 2b60913..696c9e0 100644 (file)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -508,6 +508,7 @@ static void __init setup_lowcore_dat_on(void)
 {
        struct lowcore *abs_lc;
        unsigned long flags;
+       int i;
 
        __ctl_clear_bit(0, 28);
        S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
@@ -523,8 +524,8 @@ static void __init setup_lowcore_dat_on(void)
        abs_lc = get_abs_lowcore(&flags);
        abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
        abs_lc->program_new_psw = S390_lowcore.program_new_psw;
-       memcpy(abs_lc->cregs_save_area, S390_lowcore.cregs_save_area,
-              sizeof(abs_lc->cregs_save_area));
+       for (i = 0; i < 16; i++)
+               abs_lc->cregs_save_area[i] = S390_lowcore.cregs_save_area[i];
        put_abs_lowcore(abs_lc, flags);
 }