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powerpc: Error on assembly warnings

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We currently enable -Werror on the arch/powerpc subtree. However this
only catches C warnings. Assembly warnings are logged, but the make
invocation will still succeed. This can allow incorrect syntax such as

  ori r3, r4, r5

to be compiled without catching that the assembler is treating r5
as the immediate value 5.

To prevent this in assembly files and inline assembly, add the
-fatal-warnings option to assembler invocations.

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Tested-by: Andrew Donnellan <ajd@linux.ibm.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240326044420.577031-1-bgray@linux.ibm.com
This commit is contained in:
Benjamin Gray 2024-03-26 15:44:20 +11:00 committed by Michael Ellerman
parent 01acaf3aa7
commit 608d4a5ca5
1 changed files with 2 additions and 1 deletions
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arch/powerpc/Kbuild
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@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror -Wa,-fatal-warnings
subdir-asflags-$(CONFIG_PPC_WERROR) := -Wa,-fatal-warnings
obj-y += kernel/
obj-y += mm/