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s390: Add -Wno-pointer-sign to KBUILD_CFLAGS_DECOMPRESSOR

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If the decompressor is compiled with clang this can lead to the following
warning:

In file included from arch/s390/boot/startup.c:4:
...
In file included from ./include/linux/pgtable.h:6:
./arch/s390/include/asm/pgtable.h:2065:48: warning: passing 'unsigned long *' to parameter of type
      'long *' converts between pointers to integer types with different sign [-Wpointer-sign]
 2065 |                 value = __atomic64_or_barrier(PGSTE_PCL_BIT, ptr);

Add -Wno-pointer-sign to the decompressor compile flags, like it is also
done for the kernel. This is similar to what was done for x86 to address
the same problem [1].

[1] commit dca5203e3f ("x86/boot: Add -Wno-pointer-sign to KBUILD_CFLAGS")

Cc: stable@vger.kernel.org
Reported-by: Gerd Bayer <gbayer@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2025-09-26 15:39:10 +02:00 committed by Alexander Gordeev
parent 088bb10e37
commit fa7a0a53ee
1 changed files with 1 additions and 0 deletions
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1
arch/s390/Makefile
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@ -25,6 +25,7 @@ endif
KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack -std=gnu11
KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
KBUILD_CFLAGS_DECOMPRESSOR += -D__DECOMPRESSOR
KBUILD_CFLAGS_DECOMPRESSOR += -Wno-pointer-sign
KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding