diff options
| author | Will Deacon <will@kernel.org> | 2019-08-07 13:48:33 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2019-08-07 17:20:57 +0200 |
| commit | 71c67a31f09fa8fdd1495dffd96a5f0d4cef2ede (patch) | |
| tree | 148d67a4c33964c3d72d54b3bc4f7d131dfab44b /init | |
| parent | arm64: Add support for relocating the kernel with RELR relocations (diff) | |
| download | linux-71c67a31f09fa8fdd1495dffd96a5f0d4cef2ede.tar.xz linux-71c67a31f09fa8fdd1495dffd96a5f0d4cef2ede.zip | |
init/Kconfig: Fix infinite Kconfig recursion on PPC
Commit 5cf896fb6be3 ("arm64: Add support for relocating the kernel with
RELR relocations") introduced CONFIG_TOOLS_SUPPORT_RELR, which checks
for RELR support in the toolchain as part of the kernel configuration.
During this procedure, "$(NM)" is invoked to see if it supports the new
relocation format, however PowerPC conditionally overrides this variable
in the architecture Makefile in order to pass '--synthetic' when
targetting PPC64.
This conditional override causes Kconfig to recurse forever, since
CONFIG_TOOLS_SUPPORT_RELR cannot be determined without $(NM) being
defined, but that in turn depends on CONFIG_PPC64:
$ make ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu-
scripts/kconfig/conf --syncconfig Kconfig
scripts/kconfig/conf --syncconfig Kconfig
scripts/kconfig/conf --syncconfig Kconfig
[...]
In this particular case, it looks like PowerPC may be able to pass
'--synthetic' unconditionally to nm or even drop it altogether. While
that is being resolved, let's just bodge the RELR check by picking up
$(NM) directly from the environment in whatever state it happens to be
in.
Cc: Peter Collingbourne <pcc@google.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Suggested-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig index d96127ebc44e..8b4596edda4e 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -31,7 +31,7 @@ config CC_HAS_ASM_GOTO def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC)) config TOOLS_SUPPORT_RELR - def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh) + def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh) config CC_HAS_WARN_MAYBE_UNINITIALIZED def_bool $(cc-option,-Wmaybe-uninitialized) |