From: Sasha Levin Date: Wed, 13 Jan 2021 17:32:19 +0000 (-0500) Subject: Fixes for 4.4 X-Git-Tag: v4.4.252~34 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0f038c9911013652b3b2e5592886fe2f93c04fa2;p=thirdparty%2Fkernel%2Fstable-queue.git Fixes for 4.4 Signed-off-by: Sasha Levin --- diff --git a/queue-4.4/powerpc-fix-incorrect-stw-ux-u-x-instructions-in-__s.patch b/queue-4.4/powerpc-fix-incorrect-stw-ux-u-x-instructions-in-__s.patch new file mode 100644 index 00000000000..112871a6314 --- /dev/null +++ b/queue-4.4/powerpc-fix-incorrect-stw-ux-u-x-instructions-in-__s.patch @@ -0,0 +1,52 @@ +From 5941e95cf86f8f5fd686966f6b159711141aed1b Mon Sep 17 00:00:00 2001 +From: Sasha Levin +Date: Wed, 13 Jan 2021 07:12:43 +0000 +Subject: powerpc: Fix incorrect stw{, ux, u, x} instructions in __set_pte_at + +From: Mathieu Desnoyers + +[ Upstream commit d85be8a49e733dcd23674aa6202870d54bf5600d ] + +The placeholder for instruction selection should use the second +argument's operand, which is %1, not %0. This could generate incorrect +assembly code if the memory addressing of operand %0 is a different +form from that of operand %1. + +Also remove the %Un placeholder because having %Un placeholders +for two operands which are based on the same local var (ptep) doesn't +make much sense. By the way, it doesn't change the current behaviour +because "<>" constraint is missing for the associated "=m". + +[chleroy: revised commit log iaw segher's comments and removed %U0] + +Fixes: 9bf2b5cdc5fe ("powerpc: Fixes for CONFIG_PTE_64BIT for SMP support") +Cc: # v2.6.28+ +Signed-off-by: Mathieu Desnoyers +Signed-off-by: Christophe Leroy +Acked-by: Segher Boessenkool +Signed-off-by: Michael Ellerman +Link: https://lore.kernel.org/r/96354bd77977a6a933fe9020da57629007fdb920.1603358942.git.christophe.leroy@csgroup.eu +Signed-off-by: Sasha Levin +--- + arch/powerpc/include/asm/pgtable.h | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h +index b64b4212b71f6..408f9e1fa24ac 100644 +--- a/arch/powerpc/include/asm/pgtable.h ++++ b/arch/powerpc/include/asm/pgtable.h +@@ -149,9 +149,9 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, + flush_hash_entry(mm, ptep, addr); + #endif + __asm__ __volatile__("\ +- stw%U0%X0 %2,%0\n\ ++ stw%X0 %2,%0\n\ + eieio\n\ +- stw%U0%X0 %L2,%1" ++ stw%X1 %L2,%1" + : "=m" (*ptep), "=m" (*((unsigned char *)ptep+4)) + : "r" (pte) : "memory"); + +-- +2.27.0 + diff --git a/queue-4.4/series b/queue-4.4/series index 3390efa2250..b4a4825f35f 100644 --- a/queue-4.4/series +++ b/queue-4.4/series @@ -4,3 +4,4 @@ target-simplify-xcopy-wwn-se_dev-lookup-helper.patch target-use-xcopy-segment-descriptor-cscd-ids.patch xcopy-loop-over-devices-using-idr-helper.patch scsi-target-fix-xcopy-naa-identifier-lookup.patch +powerpc-fix-incorrect-stw-ux-u-x-instructions-in-__s.patch