linux-samsung-coreprimevelte: Build with LLVM

See https://postmarketos.org/edge/2025/11/11/kernels-llvm/ for the background behind this change and how we're handling these MRs. [ci:skip-kconfigcheck]: large change across many packages, we leave kconfig fixes to kernel maintainers Signed-off-by: Jens Reidel <adrian@postmarketos.org> Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7348>
2025-11-13 23:37:31 +01:00 · 2025-11-13 23:37:31 +01:00 · f78d620dc6
commit f78d620dc6
parent a7254e9bac
3 changed files with 100 additions and 25 deletions
--- a/device/community/linux-samsung-coreprimevelte/APKBUILD
+++ b/device/community/linux-samsung-coreprimevelte/APKBUILD
@ -3,15 +3,27 @@
 _flavor=samsung-coreprimevelte
 pkgname=linux-$_flavor
 pkgver=6.15.8
-pkgrel=0
+pkgrel=1
 pkgdesc="Samsung Galaxy Core Prime VE LTE mainline kernel"
 arch="aarch64"
 _carch="arm64"
 url="https://kernel.org"
 license="GPL-2.0-only"
 options="!strip !check !tracedeps pmb:cross-native pmb:kconfigcheck-community"
-makedepends="bash bc bison devicepkg-dev findutils flex gmp-dev mpc1-dev
-mpfr-dev openssl-dev perl postmarketos-installkernel dtc zstd"
+makedepends="
+	bc
+	bison
+	clang
+	dtc
+	findutils
+	flex
+	lld
+	llvm
+	openssl-dev
+	perl
+	postmarketos-installkernel
+	zstd
+"

 # Source
 _config=config-$_flavor.$arch
@ -39,6 +51,9 @@ source="
 	0014-arm64-dts-samsung-coreprimevelte-add-vibrator.patch
 	0015-DONOTMERGE-mmc-host-Disable-Tuning-failed-message.patch
 	0016-mmc-sdhci-pxav3-add-pinctrl-setting.patch
+
+	clang21.patch
+
 	$_config
 "
 builddir="$srcdir"/linux-"$_kernver"
@ -50,13 +65,14 @@ prepare() {

 build() {
 	unset LDFLAGS
-	make ARCH="$_carch" \
+	make ARCH="$_carch" LLVM=1 \
 		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))"-$_flavor
 }

 package() {
 	make zinstall modules_install dtbs_install \
 		ARCH=$_carch \
+		LLVM=1 \
 		INSTALL_MOD_STRIP=1 \
 		INSTALL_PATH="$pkgdir"/boot \
 		INSTALL_MOD_PATH="$pkgdir" \
@ -84,5 +100,6 @@ c92dc23c0db6ad1b8bbb02a49467f9a03acf77885374b519842a238b8cefb4156a90cc654fb45dca
 ae16b59770cd76ab1777ef56a4888a073822a97ab6dbb5f18b3da7e3889c3b982c4b01930652cb68fae2082b566e1b5aacd1b81e536db71d58e7603e9cf04886  0014-arm64-dts-samsung-coreprimevelte-add-vibrator.patch
 5b3e3ba9b7ce6501bcd3b94c1e804e05ed5dbaa328c89b40f8cf466002efff704dd7c6d451cc336edf4cdac30489c416d08b13792344c3635c055a6a8b2ddcc6  0015-DONOTMERGE-mmc-host-Disable-Tuning-failed-message.patch
 782644892ae1237141431169ad3dcb5c1afad3461f8984909792fc5db9f0059403aba3a77b84867fbbffed541cccea4005169f1fe7cf38a5d81d6dab782f810b  0016-mmc-sdhci-pxav3-add-pinctrl-setting.patch
-67a8fe5570cbfee482aa70092e346f642d56ccb75b9064fd78d3efe77b42b62aebe2909c3a24f54f5c0ba2c4c35fd3a09205c6c2b3b04882c57d041dd3ad0c70  config-samsung-coreprimevelte.aarch64
+7db49d195e8034aca257d8d0673cfef2b9c2ce833332c9bae46274ef5d345da5af6fee46a3f3466a75e1771c4815794a87c8190aaccecdcd7c35195362234178  clang21.patch
+f3a1645e02edd45cd3465db395c3cd659549fd961317a3e75f46e8c863151a76781ac013bf809e2b8008bb39d27fcbf50e26eb42c27de79a5994e839d1ed95a8  config-samsung-coreprimevelte.aarch64
 "
--- a/device/community/linux-samsung-coreprimevelte/clang21.patch
+++ b/device/community/linux-samsung-coreprimevelte/clang21.patch
@ -0,0 +1,55 @@
+From 153ad566724fe6f57b14f66e9726d295d22e576d Mon Sep 17 00:00:00 2001
+From: Nathan Chancellor <nathan@kernel.org>
+Date: Tue, 15 Jul 2025 12:56:16 -0700
+Subject: [PATCH] mm/ksm: fix -Wsometimes-uninitialized from clang-21 in
+ advisor_mode_show()
+
+After a recent change in clang to expose uninitialized warnings from const
+variables [1], there is a false positive warning from the if statement in
+advisor_mode_show().
+
+  mm/ksm.c:3687:11: error: variable 'output' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
+   3687 |         else if (ksm_advisor == KSM_ADVISOR_SCAN_TIME)
+        |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  mm/ksm.c:3690:33: note: uninitialized use occurs here
+   3690 |         return sysfs_emit(buf, "%s\n", output);
+        |                                        ^~~~~~
+
+Rewrite the if statement to implicitly make KSM_ADVISOR_NONE the else
+branch so that it is obvious to the compiler that ksm_advisor can only be
+KSM_ADVISOR_NONE or KSM_ADVISOR_SCAN_TIME due to the assignments in
+advisor_mode_store().
+
+Link: https://lkml.kernel.org/r/20250715-ksm-fix-clang-21-uninit-warning-v1-1-f443feb4bfc4@kernel.org
+Fixes: 66790e9a735b ("mm/ksm: add sysfs knobs for advisor")
+Signed-off-by: Nathan Chancellor <nathan@kernel.org>
+Closes: https://github.com/ClangBuiltLinux/linux/issues/2100
+Link: https://github.com/llvm/llvm-project/commit/2464313eef01c5b1edf0eccf57a32cdee01472c7 [1]
+Acked-by: David Hildenbrand <david@redhat.com>
+Cc: Chengming Zhou <chengming.zhou@linux.dev>
+Cc: Stefan Roesch <shr@devkernel.io>
+Cc: xu xin <xu.xin16@zte.com.cn>
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
+---
+ mm/ksm.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/mm/ksm.c b/mm/ksm.c
+index 8583fb91ef136e..a9d3e719e08993 100644
+--- a/mm/ksm.c
+++ b/mm/ksm.c
+@@ -3669,10 +3669,10 @@ static ssize_t advisor_mode_show(struct kobject *kobj,
+ {
+ 	const char *output;
+ 
+-	if (ksm_advisor == KSM_ADVISOR_NONE)
+-		output = "[none] scan-time";
+-	else if (ksm_advisor == KSM_ADVISOR_SCAN_TIME)
+	if (ksm_advisor == KSM_ADVISOR_SCAN_TIME)
+ 		output = "none [scan-time]";
+	else
+		output = "[none] scan-time";
+ 
+ 	return sysfs_emit(buf, "%s\n", output);
+ }
--- a/device/community/linux-samsung-coreprimevelte/config-samsung-coreprimevelte.aarch64
+++ b/device/community/linux-samsung-coreprimevelte/config-samsung-coreprimevelte.aarch64
@ -2,15 +2,15 @@
 # Automatically generated file; DO NOT EDIT.
 # Linux/arm64 6.15.8 Kernel Configuration
 #
-CONFIG_CC_VERSION_TEXT="aarch64-alpine-linux-musl-gcc (Alpine 14.3.0) 14.3.0"
-CONFIG_CC_IS_GCC=y
-CONFIG_GCC_VERSION=140300
-CONFIG_CLANG_VERSION=0
-CONFIG_AS_IS_GNU=y
-CONFIG_AS_VERSION=24400
-CONFIG_LD_IS_BFD=y
-CONFIG_LD_VERSION=24400
-CONFIG_LLD_VERSION=0
+CONFIG_CC_VERSION_TEXT="Alpine clang version 21.1.2"
+CONFIG_GCC_VERSION=0
+CONFIG_CC_IS_CLANG=y
+CONFIG_CLANG_VERSION=210102
+CONFIG_AS_IS_LLVM=y
+CONFIG_AS_VERSION=210102
+CONFIG_LD_VERSION=0
+CONFIG_LD_IS_LLD=y
+CONFIG_LLD_VERSION=210102
 CONFIG_RUSTC_VERSION=0
 CONFIG_RUSTC_LLVM_VERSION=0
 CONFIG_CC_HAS_ASM_GOTO_OUTPUT=y
@ -18,6 +18,8 @@ CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT=y
 CONFIG_TOOLS_SUPPORT_RELR=y
 CONFIG_CC_HAS_ASM_INLINE=y
 CONFIG_CC_HAS_NO_PROFILE_FN_ATTR=y
+CONFIG_CC_HAS_COUNTED_BY=y
+CONFIG_CC_HAS_MULTIDIMENSIONAL_NONSTRING=y
 CONFIG_LD_CAN_USE_KEEP_IN_OVERLAY=y
 CONFIG_PAHOLE_VERSION=0
 CONFIG_IRQ_WORK=y
@ -163,11 +165,9 @@ CONFIG_UCLAMP_BUCKETS_COUNT=5
 CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y
 CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH=y
 CONFIG_CC_HAS_INT128=y
-CONFIG_CC_IMPLICIT_FALLTHROUGH="-Wimplicit-fallthrough=5"
+CONFIG_CC_IMPLICIT_FALLTHROUGH="-Wimplicit-fallthrough"
 CONFIG_GCC10_NO_ARRAY_BOUNDS=y
-CONFIG_CC_NO_ARRAY_BOUNDS=y
 CONFIG_GCC_NO_STRINGOP_OVERFLOW=y
-CONFIG_CC_NO_STRINGOP_OVERFLOW=y
 CONFIG_ARCH_SUPPORTS_INT128=y
 CONFIG_NUMA_BALANCING=y
 CONFIG_NUMA_BALANCING_DEFAULT_ENABLED=y
@ -284,7 +284,7 @@ CONFIG_CRASH_DUMP=y

 CONFIG_ARM64=y
 CONFIG_RUSTC_SUPPORTS_ARM64=y
-CONFIG_GCC_SUPPORTS_DYNAMIC_FTRACE_WITH_ARGS=y
+CONFIG_CLANG_SUPPORTS_DYNAMIC_FTRACE_WITH_ARGS=y
 CONFIG_64BIT=y
 CONFIG_MMU=y
 CONFIG_ARM64_CONT_PTE_SHIFT=4
@ -466,6 +466,8 @@ CONFIG_RODATA_FULL_DEFAULT_ENABLED=y
 CONFIG_ARM64_TAGGED_ADDR_ABI=y
 CONFIG_COMPAT=y
 CONFIG_KUSER_HELPERS=y
+CONFIG_COMPAT_VDSO=y
+CONFIG_THUMB2_COMPAT_VDSO=y
 # CONFIG_COMPAT_ALIGNMENT_FIXUPS is not set
 # CONFIG_ARMV8_DEPRECATED is not set

@ -514,6 +516,7 @@ CONFIG_ARM64_TLB_RANGE=y
 #
 CONFIG_AS_HAS_ARMV8_5=y
 CONFIG_ARM64_BTI=y
+CONFIG_ARM64_BTI_KERNEL=y
 CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI=y
 CONFIG_ARM64_E0PD=y
 CONFIG_ARM64_AS_HAS_MTE=y
@ -710,8 +713,13 @@ CONFIG_ARCH_SUPPORTS_SHADOW_CALL_STACK=y
 # CONFIG_SHADOW_CALL_STACK is not set
 CONFIG_ARCH_SUPPORTS_LTO_CLANG=y
 CONFIG_ARCH_SUPPORTS_LTO_CLANG_THIN=y
+CONFIG_HAS_LTO_CLANG=y
 CONFIG_LTO_NONE=y
+# CONFIG_LTO_CLANG_FULL is not set
+# CONFIG_LTO_CLANG_THIN is not set
 CONFIG_ARCH_SUPPORTS_CFI_CLANG=y
+# CONFIG_CFI_CLANG is not set
+CONFIG_HAVE_CFI_ICALL_NORMALIZE_INTEGERS_CLANG=y
 CONFIG_HAVE_CONTEXT_TRACKING_USER=y
 CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
 CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
@ -777,12 +785,9 @@ CONFIG_ARCH_HAS_GCOV_PROFILE_ALL=y
 # end of GCOV-based kernel profiling

 CONFIG_HAVE_GCC_PLUGINS=y
-CONFIG_GCC_PLUGINS=y
-CONFIG_GCC_PLUGIN_LATENT_ENTROPY=y
 CONFIG_FUNCTION_ALIGNMENT_4B=y
 CONFIG_FUNCTION_ALIGNMENT_8B=y
 CONFIG_FUNCTION_ALIGNMENT=8
-CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT=y
 CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT=y
 # end of General architecture-dependent options

@ -4975,7 +4980,6 @@ CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO=y
 CONFIG_INIT_STACK_NONE=y
 # CONFIG_INIT_STACK_ALL_PATTERN is not set
 # CONFIG_INIT_STACK_ALL_ZERO is not set
-# CONFIG_GCC_PLUGIN_STACKLEAK is not set
 # CONFIG_INIT_ON_ALLOC_DEFAULT_ON is not set
 # CONFIG_INIT_ON_FREE_DEFAULT_ON is not set
 CONFIG_CC_HAS_ZERO_CALL_USED_REGS=y
@ -4996,9 +5000,9 @@ CONFIG_CC_HAS_ZERO_CALL_USED_REGS=y
 # CONFIG_BUG_ON_DATA_CORRUPTION is not set
 # end of Hardening of kernel data structures

+CONFIG_CC_HAS_RANDSTRUCT=y
 CONFIG_RANDSTRUCT_NONE=y
 # CONFIG_RANDSTRUCT_FULL is not set
-# CONFIG_RANDSTRUCT_PERFORMANCE is not set
 # end of Kernel hardening options
 # end of Security options

@ -5380,6 +5384,7 @@ CONFIG_LIBFDT=y
 CONFIG_OID_REGISTRY=y
 CONFIG_HAVE_GENERIC_VDSO=y
 CONFIG_GENERIC_GETTIMEOFDAY=y
+CONFIG_GENERIC_COMPAT_VDSO=y
 CONFIG_GENERIC_VDSO_TIME_NS=y
 CONFIG_VDSO_GETRANDOM=y
 CONFIG_GENERIC_VDSO_DATA_STORE=y
@ -5438,9 +5443,7 @@ CONFIG_DEBUG_INFO_COMPRESSED_ZSTD=y
 # CONFIG_GDB_SCRIPTS is not set
 CONFIG_FRAME_WARN=2048
 # CONFIG_STRIP_ASM_SYMS is not set
-# CONFIG_READABLE_ASM is not set
 # CONFIG_HEADERS_INSTALL is not set
-# CONFIG_DEBUG_SECTION_MISMATCH is not set
 CONFIG_SECTION_MISMATCH_WARN_ONLY=y
 CONFIG_ARCH_WANT_FRAME_POINTERS=y
 CONFIG_FRAME_POINTER=y