linux-kernel - [GIT PULL] s390 compile fix for 6.2-rc5

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Message-ID: <Y8k0sZthY7L7rINA@osiris>
Date:   Thu, 19 Jan 2023 13:16:49 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [GIT PULL] s390 compile fix for 6.2-rc5

Hello Linus,

please pull a single compile fix for 6.2-rc5.

Thanks,
Heiko

The following changes since commit 1ecf7bd9c267ab85aff3c4a17fe56bc9754a13be:

  s390: update defconfigs (2023-01-11 21:26:40 +0100)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git tags/s390-6.2-3

for you to fetch changes up to 41e1992665a2701fa025a8b76970c43b4148446f:

  s390: workaround invalid gcc-11 out of bounds read warning (2023-01-17 19:00:59 +0100)

----------------------------------------------------------------
s390 compile fix for 6.2-rc5

- 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.

----------------------------------------------------------------
Heiko Carstens (1):
      s390: workaround invalid gcc-11 out of bounds read warning

 arch/s390/kernel/setup.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 2b6091349daa..696c9e007a36 100644
--- 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);
 }