linux-kernel - [PATCH] parisc: use -fno-strict-aliasing for decompressor

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Date:   Fri,  8 May 2020 11:35:43 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>
Cc:     Arnd Bergmann <arnd@...db.de>, kbuild test robot <lkp@...el.com>,
        linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] parisc: use -fno-strict-aliasing for decompressor

An experimental patch series of mine reworks how warnings are processed
in Kbuild. A side effect is a new warning about a harmless aliasing
rule violation in an inline function:

In file included from
include/linux/rhashtable-types.h:15:0,
                 from include/linux/ipc.h:7,
                 from include/uapi/linux/sem.h:5,
                 from include/linux/sem.h:5,
                 from include/linux/sched.h:15,
                 from include/linux/uaccess.h:6,
                 from arch/parisc/boot/compressed/misc.c:7:
include/linux/workqueue.h: In function 'work_static':
include/linux/workqueue.h:212:2: warning: dereferencing
type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  return *work_data_bits(work) & WORK_STRUCT_STATIC;

Make the decompressor use -fno-strict-aliasing like the rest of
the kernel for consistency, and to ensure this warning never makes
it into a release.

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/parisc/boot/compressed/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/parisc/boot/compressed/Makefile b/arch/parisc/boot/compressed/Makefile
index 1e5879c6a752..dff453687530 100644
--- a/arch/parisc/boot/compressed/Makefile
+++ b/arch/parisc/boot/compressed/Makefile
@@ -16,6 +16,7 @@ targets += real2.S firmware.c
 
 KBUILD_CFLAGS := -D__KERNEL__ -O2 -DBOOTLOADER
 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
+KBUILD_CFLAGS += -fno-strict-aliasing
 KBUILD_CFLAGS += $(cflags-y) -fno-delete-null-pointer-checks -fno-builtin-printf
 KBUILD_CFLAGS += -fno-PIE -mno-space-regs -mdisable-fpregs -Os
 ifndef CONFIG_64BIT
-- 
2.26.0