The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 89aba4c26fae4e459f755a18912845c348ee48f3 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '2023040335-unlisted-supernova-a6b9@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: 89aba4c26fae ("s390/uaccess: add missing earlyclobber annotations to __clear_user()") 4e1b5a86a5ed ("s390/uaccess: add missing EX_TABLE entries to __clear_user()") 731efc9613ee ("s390: convert ".insn" encoding to instruction names") 012a224e1fa3 ("s390/uaccess: introduce bit field for OAC specifier") b087dfab4d39 ("s390/crypto: add SIMD implementation for ChaCha20") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 89aba4c26fae4e459f755a18912845c348ee48f3 Mon Sep 17 00:00:00 2001 From: Heiko Carstens <hca@xxxxxxxxxxxxx> Date: Thu, 23 Mar 2023 13:09:16 +0100 Subject: [PATCH] s390/uaccess: add missing earlyclobber annotations to __clear_user() Add missing earlyclobber annotation to size, to, and tmp2 operands of the __clear_user() inline assembly since they are modified or written to before the last usage of all input operands. This can lead to incorrect register allocation for the inline assembly. Fixes: 6c2a9e6df604 ("[S390] Use alternative user-copy operations for new hardware.") Reported-by: Mark Rutland <mark.rutland@xxxxxxx> Link: https://lore.kernel.org/all/20230321122514.1743889-3-mark.rutland@xxxxxxx/ Cc: stable@xxxxxxxxxxxxxxx Reviewed-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx> Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx> Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx> diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c index 720036fb1924..d44214072779 100644 --- a/arch/s390/lib/uaccess.c +++ b/arch/s390/lib/uaccess.c @@ -172,7 +172,7 @@ unsigned long __clear_user(void __user *to, unsigned long size) "4: slgr %0,%0\n" "5:\n" EX_TABLE(0b,2b) EX_TABLE(6b,2b) EX_TABLE(3b,5b) EX_TABLE(7b,5b) - : "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2) + : "+&a" (size), "+&a" (to), "+a" (tmp1), "=&a" (tmp2) : "a" (empty_zero_page), [spec] "d" (spec.val) : "cc", "memory", "0"); return size;
