The patch below does not apply to the 4.19-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@vger.kernel.org.
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-4.19.y git checkout FETCH_HEAD git cherry-pick -x 89aba4c26fae4e459f755a18912845c348ee48f3 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023040338-emphases-eggbeater-ad1c@gregkh' --subject-prefix 'PATCH 4.19.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") de5012b41e5c ("s390/ftrace: implement hotpatching") f8c2602733c9 ("s390/ftrace: fix ftrace_update_ftrace_func implementation") d1e18efa8fa9 ("s390/lib,uaccess: get rid of register asm") fcc91d5d4047 ("s390/timex: get rid of register asm") dbb8864b28d6 ("s390/uaccess: get rid of register asm") 53c1c2504b6b ("s390/pgtable: use register pair instead of register asm") 80f06306240e ("s390/vdso: reimplement getcpu vdso syscall") 87d598634521 ("s390/mm: remove set_fs / rework address space handling") c9343637d6b2 ("s390/ftrace: assume -mhotpatch or -mrecord-mcount always available") ab177c5d00cd ("s390/mm: remove unused clear_user_asce()") cfef9aa69a73 ("s390/vdso: remove unused constants") 847d4287a0c6 ("Merge tag 's390-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 89aba4c26fae4e459f755a18912845c348ee48f3 Mon Sep 17 00:00:00 2001 From: Heiko Carstens hca@linux.ibm.com 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@arm.com Link: https://lore.kernel.org/all/20230321122514.1743889-3-mark.rutland@arm.com/ Cc: stable@vger.kernel.org Reviewed-by: Gerald Schaefer gerald.schaefer@linux.ibm.com Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Vasily Gorbik gor@linux.ibm.com
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;